Dr. Bal Chandra Yadav - Academia.edu (original) (raw)

Papers by Dr. Bal Chandra Yadav

Research paper thumbnail of High-responsivity (Ga2Ge)100−x(Ga3Sb2)x (x = 15, 30, 45, 60) photodetection sensor for optoelectronic applications

Journal of Materials Science: Materials in Electronics

Research paper thumbnail of Design and development of flexible humidity sensor for baby diaper alarm: Experimental and theoretical study

Sensors and Actuators B: Chemical, 2021

Abstract Solvent-free synthesis of nanocomposite for flexible humidity sensor is gaining immense ... more Abstract Solvent-free synthesis of nanocomposite for flexible humidity sensor is gaining immense interest to fulfill the criteria for its practical application. Herein, present paper reports the development of cadmium sulphide/ polyacrylamide nanocomposite as a flexible humidity sensor, which has been fabricated by the facile spin-coating technique on PET (polyethylene terephthalate) substrate. Morphological, optical and crystalline nature of CdS/polyacrylamide nanocomposite were investigated using Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X- ray diffraction (XRD), differential scanning calorimetric (DSC), Fourier transmission infrared spectroscopy (FTIR), UV-Visible, and Particle size analysis. Characteristic surface area and pore volume were estimated using BET analysis whereas the hydrophilicity of the sample was investigated using contact angle measurement. As fabricated sensor showed an outstanding humidity sensing response with good linearity in the humidity ranging from 11 to 95%RH. The sensitivity of nanocomposite at high humidity range (50-95%RH) was calculated as 306.47 nF/%RH and may be utilized for moisture detection of commonly used baby diaper with alarm. The simulated & optimized computer model of the synthesized composite (Cd-S & Polyacrylamide) using density functional theory and performed several analyses. HOMO-LUMO and correspondingly obtained other electronic parameters were studied, which revealed that band gap of the synthesized composite material tends to decrease upon increasing the level of water molecules owing to be better humidity sensing mechanism, and therefore it is applicable for humidity sensor.

Research paper thumbnail of Effect of MWCNTs addition on the wear and compressive deformation behavior of LM13-SiC-MWCNTs hybrid composites

Tribology International, 2018

Research paper thumbnail of Fabrication of tin substituted nickel ferrite (Sn-NiFe2O4) thin film and its application as opto-electronic humidity sensor

Sensors and Actuators A: Physical, 2018

Research paper thumbnail of Temperature Sensors based on Semiconducting Oxides: An Overview

arXiv (Cornell University), Feb 13, 2012

Research paper thumbnail of Existing and Emerging Treatment Technologies for the Degradation and Detoxification of Textile Industry Wastewater for the Environmental Safety

Research paper thumbnail of Synthesis of double perovskite LaMgCo2O5.5 nanopowder and its robust electrical humidity sensing behavior

Ceramics International, 2022

Research paper thumbnail of Fabrication of a novel nanocomposite SiO2–H3BO3–V2O5–Al2O3 via melt-quenching technique: structural and surface morphological characteristics for carbon dioxide gas sensing applications

Journal of Materials Science: Materials in Electronics, 2021

Herein, a novel nanocomposite 38SiO2–33H3BO3–25V2O5–4Al2O3 (SHV4A) was successfully fabricated us... more Herein, a novel nanocomposite 38SiO2–33H3BO3–25V2O5–4Al2O3 (SHV4A) was successfully fabricated using a melt-quenching technique. The crystalline nature of this nanocomposite was confirmed by X-ray diffraction which revealed a major phase formation of aluminium silicate, Al2SiO5 (triclinic) along with pyrochlore phases of vanadium oxide, V2O5 and boron vanadium, V3B2. Physical parameters such as density and molar volume of this nanocomposite, SHV4A were evaluated and found to be 2.668 g/cm3 and 34.161 cm3/mol. The mesoporous nature of the nanocomposite was studied using BET analysis, and the pore volume and mean pore diameter are 0.1509 cm3/g and 10 nm. Structural characterizations were also carried out using Fourier transform infrared and Raman spectroscopies. Further, to study the surface morphology and particle size the scanning electron microscope was used, the calculated average size of these flower-like petals was found to be 41.52 µm, and the fine grains had an average size of ~ 5.57 µm. To study the internal morphology of the nanocomposite the transmission electron microscope (TEM) was used. Morphological analysis suggested that the formation of interconnected flower-like crystallites is due to the major contribution of V2O5 which is confirmed by the elemental mapping analysis. The elemental constitution and its nanostructured architecture were further described using energy-dispersive X-ray analysis and TEM. This nanocomposite showed an excellent sensing behaviour and therefore a detailed sensing study was carried out to quantify the sensing response, response time, and recovery time for CO2 gas at different concentrations (200–1000 ppm). The highest sensing response was noted to be 2.43 at 1000 ppm with a response time of 24.65 s and a recovery time of 28.45 s. This nanocomposite showed advantages like low cost, easy fabrication, and good sensing response making it potentially good in CO2 gas sensing applications. These applications include detection of CO2 in the atmosphere, production of a permissible amount of CO2 from fuel industries, fermentation monitoring, and many more.

Research paper thumbnail of Synthesis and structural characterizations of HAp–NaOH–Al2O3 composites for liquid petroleum gas sensing applications

Oxford Open Materials Science, 2020

The main objective of present work was to synthesize sodium doped polycrystalline hydroxyapatite ... more The main objective of present work was to synthesize sodium doped polycrystalline hydroxyapatite NaHAp (NaOH-HAp) powder by employing wet chemical precipitation method and its composites with alumina (Al2O3; 0, 10, 40, 70 wt%) using a scalable solid-state reaction method. Detailed investigations of NaHAp and its composites using X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, UV–visible spectroscopy, scanning electron microscopy followed by energy-dispersive X-ray spectroscopy and sensing behaviour is carefully described. XRD results exhibited major and minor phase of HAp, Ca2P2O7 and NaOH for NaHAp sample while for all fabricated composites of HAp–NaOH–Al2O3 and revealed the major phase of hibonite CaO(Al2O3)6 along with secondary phases of Ca2P2O7, Na4[Al(PO4)2(OH)], Na3Al(OH)(HPO4)(PO4), NaAl3(PO4)2(OH)4 and NaOH. The crystallite size of NaHAp-based composites was also determined and lies in the range of 200–2800 nm, which is la...

Research paper thumbnail of Recent Developments in Drug Delivery System via Nanotechnology

Imperial journal of interdisciplinary research, 2016

Present article deals the detail applications of drug delivery based on nanotechnology and also r... more Present article deals the detail applications of drug delivery based on nanotechnology and also report the investigations on drug delivery based systems. The synthesis of particles using nanotechnology is used for reduction of toxicity of drugs. This review emphasize mainly the role of nanomaterials in drug delivery, kind of hazards that produced for delivery of drugs and highlights the future opportunity of several areas related to drugs.

Research paper thumbnail of Polymer chemistry underpinning materials for triboelectric nanogenerators (TENGs): Recent trends

European Polymer Journal, 2021

Abstract Triboelectric nanogenerators (TENGs) are devices that convert external mechanical energy... more Abstract Triboelectric nanogenerators (TENGs) are devices that convert external mechanical energy into electricity by combining the triboelectric effect and electrostatic induction. As a new mechanical energy harvesting system, TENGs have demonstrated high vitality and great advantage, which hold great promise for applications in various areas of the future society. Over the past few years, the exponential growth of many new classes of polymeric materials for TENGs has been demonstrated. This review presents and evaluates the range of polymer materials for TENGs, and also attempts to assess the influence of modern polymer chemistry on the development of advanced materials for TENGs. Among the most widely used polymer materials for TENGs, polymer-containing electrodes based on metal, carbon and conjugated polymers, as well as polymer triboelectric materials, which are subdivided into synthetic and natural polymers, are identified. The analysis of the use of biocompatible, biodegradable, humidity-resistant and pressure-resistant polymers in TENGs is carried out. Particular attention is paid to the use of self-healing and shape memory polymers as components of TENGs. Finally, the problems and prospects for the development of polymer materials for TENGs are outlined.

Research paper thumbnail of High efficient carbon coated TiO2 electrode for ultra-capacitor applications

Journal of Physics D: Applied Physics, 2021

The present paper reports the investigation of structural, optical, chemical bonding, and electri... more The present paper reports the investigation of structural, optical, chemical bonding, and electrical properties of the carbon black (CB)/TiO2 composite synthesized via the standard sol–gel method. The structural and morphological properties have been investigated using x-ray diffraction and also field emission scanning electron microscopy to confirm the formation of the nanocomposite. The electrochemical performance of the two-electrode symmetric fabricated supercapacitor (SC) has been examined by complex impedance spectroscopy, cyclic voltammetry, and galvanostatic charge–discharge (GCD). The electrode CT15 (15% TiO2 in CB matrix) shows a high specific capacitance of 236 F g−1 at scan rate 10 mV s−1. The GCD illustrates good specific capacitance retention of 90.3% after 10 000 cycles and with energy density and power density values as 22 Wh kg−1 and 625 kW kg−1 respectively (at 1 A g−1) in the voltage window of 1.2 V. The CT15 electrode cell demonstrates superior electrochemical performance as compared to other electrodes. Electrochemical impedance spectroscopy (EIS) demonstrates the capacitive behaviour of the composite electrode with a low value of resistance. The SC cell having optimum performance has been chosen to demonstrate the glowing red light emitting diode. A mechanism has also been proposed based on received data parameters to validate the SC performance.

Research paper thumbnail of The recent development of metal oxide heterostructures based gas sensor, their future opportunities and challenges: A review

Sensors and Actuators A: Physical, 2021

Research paper thumbnail of 2-D self-healable polyaniline-polypyrrole nanoflakes based triboelectric nanogenerator for self-powered solar light photo detector with DFT study

Journal of Colloid and Interface Science, 2021

Research paper thumbnail of Solar light active flexible activated carbon cloth‐based photocatalyst for Markovnikov‐selective radical‐radical cross‐coupling of S ‐nucleophiles to terminal alkyne and liquefied petroleum gas sensing

Journal of the Chinese Chemical Society, 2021

Research paper thumbnail of Fabrication of leaf shaped SnO2 nanoparticles via sol–gel route and its application for the optoelectronic humidity sensor

Materials Letters, 2020

Abstract In this report, synthesis of nanostructured SnO2 via sol–gel technique and its applicati... more Abstract In this report, synthesis of nanostructured SnO2 via sol–gel technique and its application for the detection of humidity level has been studied. Scanning electron microscopy (SEM) micrographs showed the formation of uniform leaf like structured SnO2 nanoparticles. The average crystalline size is discovered as 9 nm calculated by Debye Scherrer’s formula using X-ray diffraction (XRD) which shows tetragonal crystal structure. The crystallite size is further confirmed by transmission electron microscopy (TEM). The optical band gap is estimated as 3.63 eV by UV–Visible absorption spectra. The prepared SnO2 based thin film with leaf like structure enhances the feasibility for the detection of humidity, especially in the high range of 65–90 %RH. The prepared SnO2 samples shows good sensitivity towards the relative humidity. It shows 1.8nW/% RH in the humidity range 65–90% RH at 25 °C.

Research paper thumbnail of In Situ Prepared Solar Light‐Driven Flexible Actuated Carbon Cloth‐Based Nanorod Photocatalyst for Selective Radical–Radical Coupling to Vinyl Sulfides

Photochemistry and Photobiology, 2021

A global challenge faced by light harvesting photocatalyst is how to promote the selective organi... more A global challenge faced by light harvesting photocatalyst is how to promote the selective organic transformation, such as C‐S bond formation via radical–radical coupling under solar light. Here, we report a two‐dimensional covalent organic frameworks (2D‐COFs), poly (perylene‐imide‐benzoquinone) nanorod through in situ condensation on flexible activated carbon cloth (PPIBNR‐FACC) to function as a light harvester material for highly selective radical–radical coupling to vinyl sulfides (i.e. C‐S bond activation). Such a structure supports charge transfer from PPIBNR to FACC, which is essential for the selective radical–radical coupling. Hence, organic transformation is attaining high yields and selectivity (˜99%) under solar light using in situ prepared PPIBNR‐FACC photocatalyst. The structural virtues of PPIBNR‐FACC will trigger the utmost investigations into designable and versatile 2D‐COFs for fine chemical synthesis.

Research paper thumbnail of Non-functionalized Au nanoparticles can act as high-performing humidity sensor

Journal of Materials Science: Materials in Electronics, 2020

We synthesized gold (Au) nanoparticles via a rapid chemical route by reducing chloroauric acid by... more We synthesized gold (Au) nanoparticles via a rapid chemical route by reducing chloroauric acid by trisodium citrate. TEM micrographs revealed that particles were spherical with well-defined lattice structures and most of them were within the size range of 8–12 nm. A single surface plasmon resonance peak observed at 525 nm indicated the uniformness of the spherical morphology of the particles. XRD analysis showed that the particles were well crystalline. An impedance-based humidity sensor device was fabricated for depositing these gold nanoparticles in their non-functionalized state and the sensor revealed fast response time of 54 s, high stability and repeatability, and an impressive average sensitivity of 7.57 MΩ/% RH within the humidity range of 10–95%. SEM micrographs revealed the presence of cracks on the film surface and our analysis of the sensing mechanism correlated the sensitivity and the surface cracks along with smaller particle sizes. Our results show that gold nanoparticles without further functionalization are able to perform as a well-performing humidity sensor.

Research paper thumbnail of Development of an Impedance-Based Electrical Humidity Sensor Using Sb-Doped Ge-Se-Te Chalcogenide Glasses

Journal of Electronic Materials, 2020

The present paper demonstrates the effect of humidity on the (Ge11.5Te12.5Se67.5)80Sb20 and (Ge11... more The present paper demonstrates the effect of humidity on the (Ge11.5Te12.5Se67.5)80Sb20 and (Ge11.5 Te12.5Se67.5)70Sb30 thin film deposited on a glass substrate. The films prepared using a thermal evaporation technique reveal an amorphous nature as observed from the x-ray diffraction (XRD) graph. The light absorption taking place in the UV-visible region was confirmed using a UV–Vis spectrophotometer, and optical bandgap values of 1.46 eV and 1.42 eV were found for (Ge11.5Te12.5Se67.5)80Sb20 and (Ge11.5 Te12.5Se67.5)70Sb30 alloys using Tauc’s plot. The films were investigated for an impedance-based electrical humidity sensor. The maximum sensitivity of the chalcogenide sensing element was 13.86 MΩ/%RH and 15.31 MΩ/%RH for (Ge11.5Te12.5Se67.5)80Sb20 and (Ge11.5 Te12.5Se67.5)70Sb30, respectively, in the range 10–25%RH at room temperature, and the average sensitivity for the entire range of %RH was 7.33 MΩ/%RH and 9.42 MΩ/%RH, respectively, for the two glasses. The aging effect for samples was found to be negligible; hence they are stable against time, which makes them suitable for use as humidity sensors. The repeatability of the sensors was 89% and 94.45%, respectively.

Research paper thumbnail of Self-healing and shape memory metallopolymers: state-of-the-art and future perspectives

Dalton Transactions, 2020

Recent achievements and problems associated with the use of metallopolymers as self-healing and s... more Recent achievements and problems associated with the use of metallopolymers as self-healing and shape memory materials are presented and evaluated.

Research paper thumbnail of High-responsivity (Ga2Ge)100−x(Ga3Sb2)x (x = 15, 30, 45, 60) photodetection sensor for optoelectronic applications

Journal of Materials Science: Materials in Electronics

Research paper thumbnail of Design and development of flexible humidity sensor for baby diaper alarm: Experimental and theoretical study

Sensors and Actuators B: Chemical, 2021

Abstract Solvent-free synthesis of nanocomposite for flexible humidity sensor is gaining immense ... more Abstract Solvent-free synthesis of nanocomposite for flexible humidity sensor is gaining immense interest to fulfill the criteria for its practical application. Herein, present paper reports the development of cadmium sulphide/ polyacrylamide nanocomposite as a flexible humidity sensor, which has been fabricated by the facile spin-coating technique on PET (polyethylene terephthalate) substrate. Morphological, optical and crystalline nature of CdS/polyacrylamide nanocomposite were investigated using Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X- ray diffraction (XRD), differential scanning calorimetric (DSC), Fourier transmission infrared spectroscopy (FTIR), UV-Visible, and Particle size analysis. Characteristic surface area and pore volume were estimated using BET analysis whereas the hydrophilicity of the sample was investigated using contact angle measurement. As fabricated sensor showed an outstanding humidity sensing response with good linearity in the humidity ranging from 11 to 95%RH. The sensitivity of nanocomposite at high humidity range (50-95%RH) was calculated as 306.47 nF/%RH and may be utilized for moisture detection of commonly used baby diaper with alarm. The simulated & optimized computer model of the synthesized composite (Cd-S & Polyacrylamide) using density functional theory and performed several analyses. HOMO-LUMO and correspondingly obtained other electronic parameters were studied, which revealed that band gap of the synthesized composite material tends to decrease upon increasing the level of water molecules owing to be better humidity sensing mechanism, and therefore it is applicable for humidity sensor.

Research paper thumbnail of Effect of MWCNTs addition on the wear and compressive deformation behavior of LM13-SiC-MWCNTs hybrid composites

Tribology International, 2018

Research paper thumbnail of Fabrication of tin substituted nickel ferrite (Sn-NiFe2O4) thin film and its application as opto-electronic humidity sensor

Sensors and Actuators A: Physical, 2018

Research paper thumbnail of Temperature Sensors based on Semiconducting Oxides: An Overview

arXiv (Cornell University), Feb 13, 2012

Research paper thumbnail of Existing and Emerging Treatment Technologies for the Degradation and Detoxification of Textile Industry Wastewater for the Environmental Safety

Research paper thumbnail of Synthesis of double perovskite LaMgCo2O5.5 nanopowder and its robust electrical humidity sensing behavior

Ceramics International, 2022

Research paper thumbnail of Fabrication of a novel nanocomposite SiO2–H3BO3–V2O5–Al2O3 via melt-quenching technique: structural and surface morphological characteristics for carbon dioxide gas sensing applications

Journal of Materials Science: Materials in Electronics, 2021

Herein, a novel nanocomposite 38SiO2–33H3BO3–25V2O5–4Al2O3 (SHV4A) was successfully fabricated us... more Herein, a novel nanocomposite 38SiO2–33H3BO3–25V2O5–4Al2O3 (SHV4A) was successfully fabricated using a melt-quenching technique. The crystalline nature of this nanocomposite was confirmed by X-ray diffraction which revealed a major phase formation of aluminium silicate, Al2SiO5 (triclinic) along with pyrochlore phases of vanadium oxide, V2O5 and boron vanadium, V3B2. Physical parameters such as density and molar volume of this nanocomposite, SHV4A were evaluated and found to be 2.668 g/cm3 and 34.161 cm3/mol. The mesoporous nature of the nanocomposite was studied using BET analysis, and the pore volume and mean pore diameter are 0.1509 cm3/g and 10 nm. Structural characterizations were also carried out using Fourier transform infrared and Raman spectroscopies. Further, to study the surface morphology and particle size the scanning electron microscope was used, the calculated average size of these flower-like petals was found to be 41.52 µm, and the fine grains had an average size of ~ 5.57 µm. To study the internal morphology of the nanocomposite the transmission electron microscope (TEM) was used. Morphological analysis suggested that the formation of interconnected flower-like crystallites is due to the major contribution of V2O5 which is confirmed by the elemental mapping analysis. The elemental constitution and its nanostructured architecture were further described using energy-dispersive X-ray analysis and TEM. This nanocomposite showed an excellent sensing behaviour and therefore a detailed sensing study was carried out to quantify the sensing response, response time, and recovery time for CO2 gas at different concentrations (200–1000 ppm). The highest sensing response was noted to be 2.43 at 1000 ppm with a response time of 24.65 s and a recovery time of 28.45 s. This nanocomposite showed advantages like low cost, easy fabrication, and good sensing response making it potentially good in CO2 gas sensing applications. These applications include detection of CO2 in the atmosphere, production of a permissible amount of CO2 from fuel industries, fermentation monitoring, and many more.

Research paper thumbnail of Synthesis and structural characterizations of HAp–NaOH–Al2O3 composites for liquid petroleum gas sensing applications

Oxford Open Materials Science, 2020

The main objective of present work was to synthesize sodium doped polycrystalline hydroxyapatite ... more The main objective of present work was to synthesize sodium doped polycrystalline hydroxyapatite NaHAp (NaOH-HAp) powder by employing wet chemical precipitation method and its composites with alumina (Al2O3; 0, 10, 40, 70 wt%) using a scalable solid-state reaction method. Detailed investigations of NaHAp and its composites using X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, UV–visible spectroscopy, scanning electron microscopy followed by energy-dispersive X-ray spectroscopy and sensing behaviour is carefully described. XRD results exhibited major and minor phase of HAp, Ca2P2O7 and NaOH for NaHAp sample while for all fabricated composites of HAp–NaOH–Al2O3 and revealed the major phase of hibonite CaO(Al2O3)6 along with secondary phases of Ca2P2O7, Na4[Al(PO4)2(OH)], Na3Al(OH)(HPO4)(PO4), NaAl3(PO4)2(OH)4 and NaOH. The crystallite size of NaHAp-based composites was also determined and lies in the range of 200–2800 nm, which is la...

Research paper thumbnail of Recent Developments in Drug Delivery System via Nanotechnology

Imperial journal of interdisciplinary research, 2016

Present article deals the detail applications of drug delivery based on nanotechnology and also r... more Present article deals the detail applications of drug delivery based on nanotechnology and also report the investigations on drug delivery based systems. The synthesis of particles using nanotechnology is used for reduction of toxicity of drugs. This review emphasize mainly the role of nanomaterials in drug delivery, kind of hazards that produced for delivery of drugs and highlights the future opportunity of several areas related to drugs.

Research paper thumbnail of Polymer chemistry underpinning materials for triboelectric nanogenerators (TENGs): Recent trends

European Polymer Journal, 2021

Abstract Triboelectric nanogenerators (TENGs) are devices that convert external mechanical energy... more Abstract Triboelectric nanogenerators (TENGs) are devices that convert external mechanical energy into electricity by combining the triboelectric effect and electrostatic induction. As a new mechanical energy harvesting system, TENGs have demonstrated high vitality and great advantage, which hold great promise for applications in various areas of the future society. Over the past few years, the exponential growth of many new classes of polymeric materials for TENGs has been demonstrated. This review presents and evaluates the range of polymer materials for TENGs, and also attempts to assess the influence of modern polymer chemistry on the development of advanced materials for TENGs. Among the most widely used polymer materials for TENGs, polymer-containing electrodes based on metal, carbon and conjugated polymers, as well as polymer triboelectric materials, which are subdivided into synthetic and natural polymers, are identified. The analysis of the use of biocompatible, biodegradable, humidity-resistant and pressure-resistant polymers in TENGs is carried out. Particular attention is paid to the use of self-healing and shape memory polymers as components of TENGs. Finally, the problems and prospects for the development of polymer materials for TENGs are outlined.

Research paper thumbnail of High efficient carbon coated TiO2 electrode for ultra-capacitor applications

Journal of Physics D: Applied Physics, 2021

The present paper reports the investigation of structural, optical, chemical bonding, and electri... more The present paper reports the investigation of structural, optical, chemical bonding, and electrical properties of the carbon black (CB)/TiO2 composite synthesized via the standard sol–gel method. The structural and morphological properties have been investigated using x-ray diffraction and also field emission scanning electron microscopy to confirm the formation of the nanocomposite. The electrochemical performance of the two-electrode symmetric fabricated supercapacitor (SC) has been examined by complex impedance spectroscopy, cyclic voltammetry, and galvanostatic charge–discharge (GCD). The electrode CT15 (15% TiO2 in CB matrix) shows a high specific capacitance of 236 F g−1 at scan rate 10 mV s−1. The GCD illustrates good specific capacitance retention of 90.3% after 10 000 cycles and with energy density and power density values as 22 Wh kg−1 and 625 kW kg−1 respectively (at 1 A g−1) in the voltage window of 1.2 V. The CT15 electrode cell demonstrates superior electrochemical performance as compared to other electrodes. Electrochemical impedance spectroscopy (EIS) demonstrates the capacitive behaviour of the composite electrode with a low value of resistance. The SC cell having optimum performance has been chosen to demonstrate the glowing red light emitting diode. A mechanism has also been proposed based on received data parameters to validate the SC performance.

Research paper thumbnail of The recent development of metal oxide heterostructures based gas sensor, their future opportunities and challenges: A review

Sensors and Actuators A: Physical, 2021

Research paper thumbnail of 2-D self-healable polyaniline-polypyrrole nanoflakes based triboelectric nanogenerator for self-powered solar light photo detector with DFT study

Journal of Colloid and Interface Science, 2021

Research paper thumbnail of Solar light active flexible activated carbon cloth‐based photocatalyst for Markovnikov‐selective radical‐radical cross‐coupling of S ‐nucleophiles to terminal alkyne and liquefied petroleum gas sensing

Journal of the Chinese Chemical Society, 2021

Research paper thumbnail of Fabrication of leaf shaped SnO2 nanoparticles via sol–gel route and its application for the optoelectronic humidity sensor

Materials Letters, 2020

Abstract In this report, synthesis of nanostructured SnO2 via sol–gel technique and its applicati... more Abstract In this report, synthesis of nanostructured SnO2 via sol–gel technique and its application for the detection of humidity level has been studied. Scanning electron microscopy (SEM) micrographs showed the formation of uniform leaf like structured SnO2 nanoparticles. The average crystalline size is discovered as 9 nm calculated by Debye Scherrer’s formula using X-ray diffraction (XRD) which shows tetragonal crystal structure. The crystallite size is further confirmed by transmission electron microscopy (TEM). The optical band gap is estimated as 3.63 eV by UV–Visible absorption spectra. The prepared SnO2 based thin film with leaf like structure enhances the feasibility for the detection of humidity, especially in the high range of 65–90 %RH. The prepared SnO2 samples shows good sensitivity towards the relative humidity. It shows 1.8nW/% RH in the humidity range 65–90% RH at 25 °C.

Research paper thumbnail of In Situ Prepared Solar Light‐Driven Flexible Actuated Carbon Cloth‐Based Nanorod Photocatalyst for Selective Radical–Radical Coupling to Vinyl Sulfides

Photochemistry and Photobiology, 2021

A global challenge faced by light harvesting photocatalyst is how to promote the selective organi... more A global challenge faced by light harvesting photocatalyst is how to promote the selective organic transformation, such as C‐S bond formation via radical–radical coupling under solar light. Here, we report a two‐dimensional covalent organic frameworks (2D‐COFs), poly (perylene‐imide‐benzoquinone) nanorod through in situ condensation on flexible activated carbon cloth (PPIBNR‐FACC) to function as a light harvester material for highly selective radical–radical coupling to vinyl sulfides (i.e. C‐S bond activation). Such a structure supports charge transfer from PPIBNR to FACC, which is essential for the selective radical–radical coupling. Hence, organic transformation is attaining high yields and selectivity (˜99%) under solar light using in situ prepared PPIBNR‐FACC photocatalyst. The structural virtues of PPIBNR‐FACC will trigger the utmost investigations into designable and versatile 2D‐COFs for fine chemical synthesis.

Research paper thumbnail of Non-functionalized Au nanoparticles can act as high-performing humidity sensor

Journal of Materials Science: Materials in Electronics, 2020

We synthesized gold (Au) nanoparticles via a rapid chemical route by reducing chloroauric acid by... more We synthesized gold (Au) nanoparticles via a rapid chemical route by reducing chloroauric acid by trisodium citrate. TEM micrographs revealed that particles were spherical with well-defined lattice structures and most of them were within the size range of 8–12 nm. A single surface plasmon resonance peak observed at 525 nm indicated the uniformness of the spherical morphology of the particles. XRD analysis showed that the particles were well crystalline. An impedance-based humidity sensor device was fabricated for depositing these gold nanoparticles in their non-functionalized state and the sensor revealed fast response time of 54 s, high stability and repeatability, and an impressive average sensitivity of 7.57 MΩ/% RH within the humidity range of 10–95%. SEM micrographs revealed the presence of cracks on the film surface and our analysis of the sensing mechanism correlated the sensitivity and the surface cracks along with smaller particle sizes. Our results show that gold nanoparticles without further functionalization are able to perform as a well-performing humidity sensor.

Research paper thumbnail of Development of an Impedance-Based Electrical Humidity Sensor Using Sb-Doped Ge-Se-Te Chalcogenide Glasses

Journal of Electronic Materials, 2020

The present paper demonstrates the effect of humidity on the (Ge11.5Te12.5Se67.5)80Sb20 and (Ge11... more The present paper demonstrates the effect of humidity on the (Ge11.5Te12.5Se67.5)80Sb20 and (Ge11.5 Te12.5Se67.5)70Sb30 thin film deposited on a glass substrate. The films prepared using a thermal evaporation technique reveal an amorphous nature as observed from the x-ray diffraction (XRD) graph. The light absorption taking place in the UV-visible region was confirmed using a UV–Vis spectrophotometer, and optical bandgap values of 1.46 eV and 1.42 eV were found for (Ge11.5Te12.5Se67.5)80Sb20 and (Ge11.5 Te12.5Se67.5)70Sb30 alloys using Tauc’s plot. The films were investigated for an impedance-based electrical humidity sensor. The maximum sensitivity of the chalcogenide sensing element was 13.86 MΩ/%RH and 15.31 MΩ/%RH for (Ge11.5Te12.5Se67.5)80Sb20 and (Ge11.5 Te12.5Se67.5)70Sb30, respectively, in the range 10–25%RH at room temperature, and the average sensitivity for the entire range of %RH was 7.33 MΩ/%RH and 9.42 MΩ/%RH, respectively, for the two glasses. The aging effect for samples was found to be negligible; hence they are stable against time, which makes them suitable for use as humidity sensors. The repeatability of the sensors was 89% and 94.45%, respectively.

Research paper thumbnail of Self-healing and shape memory metallopolymers: state-of-the-art and future perspectives

Dalton Transactions, 2020

Recent achievements and problems associated with the use of metallopolymers as self-healing and s... more Recent achievements and problems associated with the use of metallopolymers as self-healing and shape memory materials are presented and evaluated.