Dr Jalindar AMBEKAR - Academia.edu (original) (raw)

Papers by Dr Jalindar AMBEKAR

Journal of chemical and pharmaceutical research, 2014

Synthesis of nano materials using novel and ecofriendly methods is under expedition. A novel gree... more Synthesis of nano materials using novel and ecofriendly methods is under expedition. A novel green route method has been adopted for the preparation of silver nanoparticles, using Abelmoschus esculentus (Okra) juice as a natural binder. XRD, FTIR, UV-Vis, FE-SEM and TEM have been employed for characterization. UV-Vis analysis of the nanomaterial gave a peak at 445nm indicating a successful green route synthesis. FTIR analysis showed the

RSC Advances, 2022

A novel, highly sensitive gold nanowire (AuNW) resistive sensor is reported here for humidity sen... more A novel, highly sensitive gold nanowire (AuNW) resistive sensor is reported here for humidity sensing in the relative humidity range of 11% to 92% RH as well as for breath sensing.

RSC Advances, 2021

The novel marigold flower like SiO2@ZnIn2S4nano-heterostructure was fabricated using anin situhyd... more The novel marigold flower like SiO2@ZnIn2S4nano-heterostructure was fabricated using anin situhydrothermal method.

Proceedings IMCS 2012, 2012

Ink-Jet Printed, Intrinsically Conducting Polymer (ICP), polyaniline have been used for humidity ... more Ink-Jet Printed, Intrinsically Conducting Polymer (ICP), polyaniline have been used for humidity sensing at room temperature. Polyaniline based, aqueous ink-jet printable ink has been synthesized by single step, chemical oxidative polymerization technique. Sulphonic acids were used as a dopant during the in-situ polymerization process. This is a single step polymerization process for the direct synthesis of conducting emeraldine salt phase of the polymer as an ink formulation. The synthesized polyaniline ink was further characterized by spectroscopic (UV-Vis. and FT-IR) analysis which confirmed the presence of conducting emeraldine salt phase of the polymer. The viscosity of the ink was measured by using Brook-field viscometer. The successive trials were performed for the printing of IDT pattern on the flexible, untreated polymer substrate using HP ink-jet-printer. The printed sensor was subjected for the humidity sensing measurements. The change in the resistance with change in the %RH was observed. It is suggested that the increase in conductivity at high humidity may be related to a vapour-induced change in the transfer of charge carriers between the polymer chains. The synthesized polyaniline based ink can also be considered as a good candidate for variety of ink-jet printed low cost electronics devices.

E3S Web of Conferences, 2020

The synthesis of cost-effective and safe polymeric nanocomposite materials has been a subject of ... more The synthesis of cost-effective and safe polymeric nanocomposite materials has been a subject of interest and study for material science researchers. Poly (N-Methyl Aniline) –Li nanocomposite has been synthesized by a one-pot in-situ method and has been explored as an electrolyte in the battery. Poly (N-Methyl Aniline)-Li nanocomposite prepared, has been characterized by UV-visible, FTIR, FE-SEM, X-ray diffraction techniques. A mechanism of interaction of lithiumion with nitrogen at the imine site has been proposed. The charge-discharge process of poly (N-Methyl Aniline) –Li nanocomposite, when used in the battery, has been discussed.

Journal of Composites Science, 2019

The three-dimensional hierarchical SrS/Bi2S3 heterostructures were synthesized by a template-free... more The three-dimensional hierarchical SrS/Bi2S3 heterostructures were synthesized by a template-free single-step hydrothermal method. The structural and morphological studies revealed the formation of a single crystalline orthorhombic heterostructure with rod-like morphologies possessing a high aspect ratio. The field emission properties of SrS/Bi2S3 nanorods were investigated. J–E and the Fowler–Nordheim (F–N) plot, as well as long-term field emission (FE) stability, were studied. SrS/Bi2S3 nanoflowers have enhanced the FE properties more than the virgin Bi2S3. The observed values of the re-producible turn-on field for SrS/Bi2S3 defined to draw an emission current density of ca. 1 µA/cm2 were found to be ca. 2.50 V/µm, and of the threshold field to draw a current density of ca. 10 µA/cm2 were found to be ca. 3.00 V/µm (without visible light illumination). A maximum emission current density of ca. 527 μA/cm2 was drawn without light and a current density of ca. 1078 μA/cm2 with light, w...

RSC Advances, 2019

A dark coloured effluent called “spent wash” is generated as an unwanted product in sugar based a... more A dark coloured effluent called “spent wash” is generated as an unwanted product in sugar based alcohol distillery which is degraded to less toxic compounds using visible light active Cr–TiO2 photocatalyst under natural sunlight.

New Journal of Chemistry, 2018

SILAR grown nickel nanoparticles are electrocatalytically active for ethanol electrooxidation.

RSC Advances, 2018

The versatile paper template synthesis of LTO has been demonstrated with an interconnected nanopa... more The versatile paper template synthesis of LTO has been demonstrated with an interconnected nanoparticles network. The system exhibits accelerated interfacial charge transfer which in turn confers enhanced stable electrochemical performance in LIBs.

ACS applied materials & interfaces, Jan 23, 2016

Herein, we demonstrate the synthesis of rGO/BiVO4 hybrid nanostructures by facile hydrothermal me... more Herein, we demonstrate the synthesis of rGO/BiVO4 hybrid nanostructures by facile hydrothermal method. Morphological studies reveal that rGO sheets are embedded in the special dendritic fern-like structures of BiVO4. The rGO/BiVO4 hybrid architecture shows the way to a rational design of supercapacitor, since these structures enable easy access of electrolyte ions by reducing internal resistance. Considering the unique morphological features of rGO/BiVO4 hybrid nanostructures, their supercapacitive properties were investigated. The rGO/BiVO4 electrode exhibits a specific capacitance of 151 F/g at the current density of 0.15 mA/cm(2). Furthermore, we have constructed rGO/BiVO4 symmetric cell which exhibits outstanding volumetric energy density of 1.6 mW h/cm(3) (33.7 W h/kg) and ensures rapid energy delivery with power density of 391 mW/cm(3) (8.0 kW/kg). The superior properties of symmetric supercapacitor can be attributed to the special dendritic fern-like BiVO4 morphology and intr...

Journal of Materials Chemistry A, 2016

Hydrothermally synthesized Ag:BiVO4 with a dendritic structure as an excellent electrode material... more Hydrothermally synthesized Ag:BiVO4 with a dendritic structure as an excellent electrode material for symmetric supercapacitors.

Cellulose Chemistry and Technology

A facile, green route method has been developed for the synthesis of silver nanoparticles. A sing... more A facile, green route method has been developed for the synthesis of silver nanoparticles. A single step ecofriendly approach has been employed usinga natural polymer, okara juice (Abelmoschus esculentus) as a binding agent, along with mandelic acid as reducing agent. UV-visible absorption spectrum recorded for the solution has shown significant bands in the range of 200nm to 600nm.The morphology of silver nanoparticles was observed by FE-SEM and Transmission electron microscopy (TEM). The prepared silver nanoparticles showed unique anti-microbial activity against gram-negative bacteria, such as Escherichia coli, and gram-positive bacteria, such as Staphylococcus aureus. INTRODUCTION Nanoparticles are of extreme research interest, as they bridge the gap between bulk materials and atomic or molecular structures. The synthesis of nanoparticles has been extensively studied mainly owing to their advantageous applications. 1-2 The properties of nanomaterials strongly depend upon the size...

Nanoscience and Nanotechnology Letters, 2014

ABSTRACT Here in, we have synthesized one dimensional CdS nano/micro rods using solvothermal reac... more ABSTRACT Here in, we have synthesized one dimensional CdS nano/micro rods using solvothermal reaction technique at 200 �C for 12 and 48 hrs respectively. The synthesized material was characterized using various spectroscopic techniques such as, X-ray diffraction (XRD), Diffuse reflectance UV-visible absorbance (DRS) and photoluminescence (PL), Field emission scanning electron microscopy (FE-SEM) and Transmission electron microscopy (TEM). The XRD confirms the formation of crystalline CdS having hexagonal structure. The band gap observed to be around ∼2.4 eV in both the cases. FE-SEM indicates the formation of one dimensional CdS nano rods. The CdS synthesized at 200 �C for 12 hrs have diameter ∼15 nm and length ∼150 to 200 nm. Whereas, CdS synthesized for 48 hrs shows increase in length from nanometer to several microns. Overall, with increase in reaction time the aspect ratio increases. TEM also confirms the formation of uniform size one dimensional (1D) CdS nanostructures. The photocatalytic activity was evaluated by following the degradation of 10 ppm methylene blue (MB) solution under 400 W mercury vapor lamp. CdS synthesized with lower reaction time shows less photocatalytic activity as compare to CdS synthesized at higher reaction time. Photocatalytic MB degradation using 1D CdS follows pseudo first order reaction kinetics, the observed apparent rate constant (Kapp) values for MB degradation using CdS synthesized for 12 and 48 hrs are 0�91×10−2 and 1�04×10−2 min−1 respectively. Keywords: Photocatalysis, Dye Degradation, One Dimensional Nanostructures, Methylene Blue

Science of Advanced Materials, 2014

ABSTRACT A highly crystalline ZnO nano pencils/rods were successfully synthesized via low cost an... more ABSTRACT A highly crystalline ZnO nano pencils/rods were successfully synthesized via low cost and template free solvothermal method. The reaction was carried out at 200 °C for 2, 5 and 12 h respectively. The reaction time enhances the photoluminescent properties of ZnO, mainly the intensity of green emission band increased. X-ray diffraction revealed the formed products have a wurtzite structure. The morphology and microstructure analyses of ZnO nano pencils/rods were performed by field emission scanning electron microscopy and transmission electron microscopy. The ZnO nanorods are about 20 to 70 nm in width and length varies from nm to sub-micron size. TEM confirms formation of pencil and rod shaped ZnO nanostructures. ZnO synthesized using different reaction time showed UV-Visible absorbance at 372 nm. Photoluminescence measurement showed UV emission peak and broad yellow–green emission peak centered at 390 and 500 nm respectively. Photocatalytic activity of synthesized ZnO was evaluated by following the degradation of aqueous methylene blue dye. Change in the photocatalytic activity was observed with change in reaction time of ZnO synthesis. ZnO prepared at 2 h of reaction time showed apparent rate constant (K app) of 8.8 × 10–2 min–1 for MB degradation.

RSC Advances, 2015

Lawesson's reagent (LR) has been effectively exploited for the synthesis of hierarchical arch... more Lawesson's reagent (LR) has been effectively exploited for the synthesis of hierarchical architectures of cadmium sulphide (CdS) nanostructures for the first time.

Materials Chemistry and Physics, 2006

In our pursuit to unravel the materials aspects of photoimageable thick film pastes, we herein fu... more In our pursuit to unravel the materials aspects of photoimageable thick film pastes, we herein furnish a preliminary account of preparation and allied characterization of aqueous developable photoimageable silver conductor paste as a function of weight percentage of glass frit binder. This photoimageable paste is comprised of submicron sized silver powder, micron sized lead borosilicate glass frit, epoxy acrylate resin

Journal of Nanoengineering and Nanomanufacturing, 2013

ABSTRACT Ultra thin single crystalline SnO2 nano rods were synthesized using a novel template fre... more ABSTRACT Ultra thin single crystalline SnO2 nano rods were synthesized using a novel template free chemical method. The prepared SnO2 nano rods were characterized using uv-visible and photoluminescence spectroscopy, BET, XRD, FE-SEM and TEM analysis techniques. The broad XRD peak confirms the formation of nano crystalline SnO2 having tetragonal crystal structure. PL spectra exhibit the broad emission peak at 365 nm corresponding to the band edge excitation. FE-SEM indicates the formation of SnO2 nanostructures having size less than 10 nm. TEM confirms the formation of rod like morphology having diameter 4±1 nm and length around 6 to 10 nm. The observed BET surface area for the SnO2 nanorods is 134 m2/gm and this higher surface area exhibits excellent ability to remove organic pollutant from wastewater by enormous surface adsorption. The photocatalytic activity of prepared SnO2 was studied by observing the degradation of aqueous methylene blue (MB) dye. The rate constant observed for photocatalytic MB degradation using SnO2 was 5.4×10−2 min−1. The photocatalytic activity was compared with P-25 degussa TiO2 under same reaction conditions. KEYWORDS: Tin Oxide, Photocatalysis, Dye Degradation, Methylene Blue.

Science of Advanced Materials, 2013

ABSTRACT Highly crystalline SnS2 nano sheets were synthesized by single step hydrothermal reactio... more ABSTRACT Highly crystalline SnS2 nano sheets were synthesized by single step hydrothermal reaction technique without using any surfactant. The resultant product was characterized using various spectroscopic techniques. XRD confirms the formation of crystalline hexagonal phase of SnS2 with (101) and (110) preferred orientations. FESEM analysis reveales the formation of hexagonal plates having size in the range of 0.5 to 1 �m with thickness of the plates around 10–20 nm. These hexagonal plates are oriented in such a way that they form micron sized rose flower like structure. TEM analysis confirms the formation of uniform sized SnS2 hexagonal plates. The distinct hexagonal ring in SAED pattern substantiates formation of crystalline hexagonal structure. The Diffuse reflactance spectrum (DRS) displayed the absorption edge around 575 nm corresponding to the band gap value of 2.15 eV. Photocatalytic activity of the resultant SnS2 was studied by observing the degradation of aqueous methylene blue (MB) dye under visible light irradiation. The rate constants observed for photocatalytic MB degradation are 17.9×10−3, 3.6×10−3 and 2.2×10−3 min−1 using SnS2, P-25 Degussa TiO2 and anatase TiO2, respectively. The study revealed that the synthesized SnS2 nanoparticles have better photocatalytic activity than that of P-25 Degussa TiO2 towards MB degradation. KEYWORDS: Hydrothermal, 2D Nano Sheets, Photocatalysis, Dye Degradation.

Advanced Science, Engineering and Medicine, 2012

ABSTRACT Highly crystalline wurtzite ZnS nanowires in the form of spheroidal nanowire bundles hav... more ABSTRACT Highly crystalline wurtzite ZnS nanowires in the form of spheroidal nanowire bundles have been synthesized by template free hydrothermal method using zinc nitrate and thiourea as precursors. ZnS microspheres via self assembling of ZnS nanoparticles were obtained within 18 h recation time. The diameter of the nanoparticles of the microspheres was obeserved to be 25–40 nm. Highly crystalline bundles of nanowires are obtained within 48 h reaction time. The size of the short nanowires is in the range of 10–20 nm as observed by the TEM. The band gap of the microspheres and wires has been estimated to be 3.67 and 3.74 eV implying the nanocrystalline nature of the materials. Photoluminiscence study showed the emission peaks at 334, 404 and 429 nm which are attributed to the nanocrystalline nature of ZnS. Being a wide band gap semiconductor, we have used ZnS nanostructures as a photocatalyst for oraganic dye (methylene blue) degradation and found better photocatalytic activity in comparison to the bulk ZnS.