Narinder Arora - Academia.edu (original) (raw)
Papers by Narinder Arora
Bulletin of Materials Science, 1992
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Current materials science, Mar 30, 2022
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Surface Innovations, 2018
A cost-effective drop-cast technique has been used to deposit copper phthalocyanine (CuPc) films ... more A cost-effective drop-cast technique has been used to deposit copper phthalocyanine (CuPc) films on a glass substrate. The obtained films have undergone structural, optical and electrical characterization after annealing at different temperatures – that is, 100, 150 and 200°C. The X-ray diffraction spectra confirm the formation of CuPc films. The absorption spectra of the drop-cast CuPc films show two dominant bands – Q-band and Soret band – within wavelengths of 300–800 nm, respectively. Phase transformations from the α-phase to β-phase have been observed from structural and optical characterization. The current–voltage parameters of the films show ohmic contact, and their activation energies lie in the range of 0·21–0·54 eV annealed within temperatures of 100–200°C. The vapor-sensing characteristics of the CuPc-based sensor toward ammonia at different concentrations (15–230 parts per million) have been evaluated. These measurements reveal that CuPc films are a good candidate as am...
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Advances in Applied Science Research, 2016
The titanium dioxide films have been obtained by spray pyrolysis technique on to the glass substr... more The titanium dioxide films have been obtained by spray pyrolysis technique on to the glass substrates kept at different temperature (300- 4000C) .The conditions have been optimized to obtain quality films. Films so obtained have been characterized for their structure through x-ray diffractograms. Optical absorption studies of the films have been made through UV-Visible spectroscopy in the spectral range 300 -1100 nm. Effect of substrate temperature on the structure and optical properties of these films has been studied. Results indicate that the films so obtained are promising candidates for solar cells.
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Emerging Materials Research, 2018
Gum acacia (GA) is a natural gum with a high molecular weight; it is a polysaccharide material th... more Gum acacia (GA) is a natural gum with a high molecular weight; it is a polysaccharide material that is acidic in nature and the least viscous among hydrocolloids. The ion-conducting behavior of water-dissolvable GA-based gel electrolytes has been studied with salt (ammonium chloride (NH4Cl)) concentration, GA content and temperature enhancement. The conductivity of GA-based gel electrolytes without salt has been found to increase with the increase in GA content at low concentrations and reaches a maximum value of 4·99 × 10−3 S/cm at 40 wt.% of GA and then shows a small decrease at higher concentrations of GA. GA-based gel electrolytes show ionic conductivity decrements and indicate negative activation energy with increase in temperature, which contradicts the theoretical explanation – that is, σ = σ o exp(−E a/K b T). An ionic conductivity on the order of 10−1 S/cm has been observed for varying weights percentages of GA-based gel electrolytes containing 5 M ammonium chloride and doe...
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i-manager's Journal on Material Science, 2014
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i-manager's Journal on Material Science, 2014
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Journal of Nanoelectronics and Optoelectronics, 2019
AC transport properties and dielectric response of sandwich geometry (Ag/CuPc/Ag) of CuPc(CuPc) t... more AC transport properties and dielectric response of sandwich geometry (Ag/CuPc/Ag) of CuPc(CuPc) thin films deposited using thermal evaporation technique have been studied within frequency range 1 Hz–10 KHz and in temperature range 303–383 K. Scanning electron microscope (SEM) investigations of these films reveal fiber like morphology. Crystalline natures of CuPc films have been characterized using X-ray diffraction for different temperatures. The molecular orientations in films for different substrate temperatures have been confirmed by Raman spectroscopy. The optical band gaps calculated from the UV–Visible absorption spectra is found to lie in the range 3.01–3.15 eV. Electrical conductivity of CuPc films increases with increase of temperature. The hole mobility values of CuPc films at different temperatures have been calculated using negative differential susceptance (–ΔB) technique. Both capacitance and dielectric constant have been found to decrease with the increase of frequenc...
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Solid State Ionics, 2018
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Solid State Ionics, 2017
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Ionics, 2017
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Ionics, 2016
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Solid State Ionics, 2000
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Nano Tools and Devices for Enhanced Renewable Energy, 2021
Polymer electrolytes (PEs) comprising the polar polymer complexed with ionic salts are important ... more Polymer electrolytes (PEs) comprising the polar polymer complexed with ionic salts are important because of their use in different electrochemical devices such as solid-state batteries, fuel cells, supercapacitors, electrochromic devices, smart windows, and sensors. PEs are generally preferred due to some of their special properties such as good electrode–electrolyte contact, ease of preparation, high conductivity, good mechanical stability, wide range of composition, and hence wider control of properties. The PEs are classified as polymer–salt complexes, plasticized PEs, and nanocomposite PEs. The conductivity of PEs is quite small, which restricts their use in potential applications. The conductivity of the PEs is increased by incorporating suitable plasticizers in them, but the mechanical properties are relatively poor. The plasticizers have high dielectric constant, low viscosity, low freezing point, and high boiling point. The mechanical properties of PEs are improved by adding...
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Ionics, 2018
Gel polymer electrolytes (GPEs) were prepared by dissolving lithium tetrafluoroborate (LiBF4) sal... more Gel polymer electrolytes (GPEs) were prepared by dissolving lithium tetrafluoroborate (LiBF4) salt, poly(methylmethacrylate) (PMMA) polymer and distinct non-volatile solvents propylene carbonate (PC), and -N,N-dimethylformamide (DMF) in single as well as binary solvent mixtures. Ionic conductivities of 8.93 mS/cm and 6.68 mS/cm at 25 °C have been obtained for gel polymer electrolytes for 10 wt% PMMA in the solution of LiBF4 in binary solvent mixture of PC:DMF in (1:1) and (2:1) volume ratios respectively. The dispersion of nano-sized silica in gel polymer electrolyte not only exhibits small change in ionic conductivity but also enhances the mechanical strength as well as viscosity of gel polymer electrolytes. At room temperature, the ionic conductivity has been found to be 8.00 mS/cm for 6 wt% nano-sized silica in GPEs. Fourier-transform infrared (FTIR) spectroscopic studies have been used to scrutinize the corroboration of the complexation between PMMA, LiBF4, PC, DMF, PC:DMF, and SiO2. The interactions between salt and solvents in liquid electrolytes have also been analyzed by FTIR spectroscopy illustrating the strong interaction between lithium salt and solvent molecules. The appearance/disappearance and shifting of some peaks confirm the interaction among the constituents of nano-dispersed gel polymer electrolytes. The mechanical strength was confirmed by dynamic mechanical analysis (DMA) and viscosity [ηPC:DMF (2:1) > ηPC:DMF (1:1) > ηPC] for nano-dispersed silica-based gel polymer electrolytes. The electrical and mechanical stability with high ionic conductivity for such gel polymer electrolytes makes these electrolytes suitable for many device applications like high energy density lithium-ion batteries, super-capacitors, electro-chromic devices etc.
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Polymer Bulletin, 2021
Gum acacia (GA) based gel electrolyte was cross-linked with polyvinyl alcohol (PVA) in the presen... more Gum acacia (GA) based gel electrolyte was cross-linked with polyvinyl alcohol (PVA) in the presence of different concentrations of NaOH salt for the preparation of stable, biodegradable and saprophyte-free gel matrix, and characterized them with ionic conductivity, pH, FTIR and TGA studies. The maximum ionic conductivity (σ = 4.39 mS/cm at 30 °C) has been observed for GA-PVA based gel electrolyte containing lower concentration of NaOH salt and the analyte reaches toward neutral pH region as compared to acidic nature of gum acacia-based gel electrolyte in deionized water having ionic conductivity of 4.99 mS/cm at 30 °C. Physical cross-linking for better jellification has been analyzed through FTIR and thermogravimetric analysis (TGA). FTIR spectra of GA-PVA based gel electrolyte indicate the stability of the gel matrix at nearly neutral pH region and undergo complex decomposition with the influence of higher salt concentrations. Thermal stability and thermal behavior of gel electrolytes were investigated under non-isothermal conditions by thermogravimetric analysis and differential thermogravimetry (DTG), and the obtained results exhibit variations in the glass transition temperature (Tg) suggesting the miscibility of the compositions and also support the existence of compatibility of such system. Gel electrolyte with suitable composition indicates better stability near neutral pH region and small change in ionic conductivity over the temperature range of 10–70 °C make them suitable and applicable for many solid-state ionic device applications.
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European Polymer Journal, 2003
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Solid State Ionics, 2000
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Bulletin of Materials Science, 1992
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Current materials science, Mar 30, 2022
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Surface Innovations, 2018
A cost-effective drop-cast technique has been used to deposit copper phthalocyanine (CuPc) films ... more A cost-effective drop-cast technique has been used to deposit copper phthalocyanine (CuPc) films on a glass substrate. The obtained films have undergone structural, optical and electrical characterization after annealing at different temperatures – that is, 100, 150 and 200°C. The X-ray diffraction spectra confirm the formation of CuPc films. The absorption spectra of the drop-cast CuPc films show two dominant bands – Q-band and Soret band – within wavelengths of 300–800 nm, respectively. Phase transformations from the α-phase to β-phase have been observed from structural and optical characterization. The current–voltage parameters of the films show ohmic contact, and their activation energies lie in the range of 0·21–0·54 eV annealed within temperatures of 100–200°C. The vapor-sensing characteristics of the CuPc-based sensor toward ammonia at different concentrations (15–230 parts per million) have been evaluated. These measurements reveal that CuPc films are a good candidate as am...
Bookmarks Related papers MentionsView impact
Advances in Applied Science Research, 2016
The titanium dioxide films have been obtained by spray pyrolysis technique on to the glass substr... more The titanium dioxide films have been obtained by spray pyrolysis technique on to the glass substrates kept at different temperature (300- 4000C) .The conditions have been optimized to obtain quality films. Films so obtained have been characterized for their structure through x-ray diffractograms. Optical absorption studies of the films have been made through UV-Visible spectroscopy in the spectral range 300 -1100 nm. Effect of substrate temperature on the structure and optical properties of these films has been studied. Results indicate that the films so obtained are promising candidates for solar cells.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Emerging Materials Research, 2018
Gum acacia (GA) is a natural gum with a high molecular weight; it is a polysaccharide material th... more Gum acacia (GA) is a natural gum with a high molecular weight; it is a polysaccharide material that is acidic in nature and the least viscous among hydrocolloids. The ion-conducting behavior of water-dissolvable GA-based gel electrolytes has been studied with salt (ammonium chloride (NH4Cl)) concentration, GA content and temperature enhancement. The conductivity of GA-based gel electrolytes without salt has been found to increase with the increase in GA content at low concentrations and reaches a maximum value of 4·99 × 10−3 S/cm at 40 wt.% of GA and then shows a small decrease at higher concentrations of GA. GA-based gel electrolytes show ionic conductivity decrements and indicate negative activation energy with increase in temperature, which contradicts the theoretical explanation – that is, σ = σ o exp(−E a/K b T). An ionic conductivity on the order of 10−1 S/cm has been observed for varying weights percentages of GA-based gel electrolytes containing 5 M ammonium chloride and doe...
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i-manager's Journal on Material Science, 2014
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i-manager's Journal on Material Science, 2014
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Journal of Nanoelectronics and Optoelectronics, 2019
AC transport properties and dielectric response of sandwich geometry (Ag/CuPc/Ag) of CuPc(CuPc) t... more AC transport properties and dielectric response of sandwich geometry (Ag/CuPc/Ag) of CuPc(CuPc) thin films deposited using thermal evaporation technique have been studied within frequency range 1 Hz–10 KHz and in temperature range 303–383 K. Scanning electron microscope (SEM) investigations of these films reveal fiber like morphology. Crystalline natures of CuPc films have been characterized using X-ray diffraction for different temperatures. The molecular orientations in films for different substrate temperatures have been confirmed by Raman spectroscopy. The optical band gaps calculated from the UV–Visible absorption spectra is found to lie in the range 3.01–3.15 eV. Electrical conductivity of CuPc films increases with increase of temperature. The hole mobility values of CuPc films at different temperatures have been calculated using negative differential susceptance (–ΔB) technique. Both capacitance and dielectric constant have been found to decrease with the increase of frequenc...
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Solid State Ionics, 2018
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Solid State Ionics, 2017
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Ionics, 2017
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Ionics, 2016
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Solid State Ionics, 2000
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Nano Tools and Devices for Enhanced Renewable Energy, 2021
Polymer electrolytes (PEs) comprising the polar polymer complexed with ionic salts are important ... more Polymer electrolytes (PEs) comprising the polar polymer complexed with ionic salts are important because of their use in different electrochemical devices such as solid-state batteries, fuel cells, supercapacitors, electrochromic devices, smart windows, and sensors. PEs are generally preferred due to some of their special properties such as good electrode–electrolyte contact, ease of preparation, high conductivity, good mechanical stability, wide range of composition, and hence wider control of properties. The PEs are classified as polymer–salt complexes, plasticized PEs, and nanocomposite PEs. The conductivity of PEs is quite small, which restricts their use in potential applications. The conductivity of the PEs is increased by incorporating suitable plasticizers in them, but the mechanical properties are relatively poor. The plasticizers have high dielectric constant, low viscosity, low freezing point, and high boiling point. The mechanical properties of PEs are improved by adding...
Bookmarks Related papers MentionsView impact
Ionics, 2018
Gel polymer electrolytes (GPEs) were prepared by dissolving lithium tetrafluoroborate (LiBF4) sal... more Gel polymer electrolytes (GPEs) were prepared by dissolving lithium tetrafluoroborate (LiBF4) salt, poly(methylmethacrylate) (PMMA) polymer and distinct non-volatile solvents propylene carbonate (PC), and -N,N-dimethylformamide (DMF) in single as well as binary solvent mixtures. Ionic conductivities of 8.93 mS/cm and 6.68 mS/cm at 25 °C have been obtained for gel polymer electrolytes for 10 wt% PMMA in the solution of LiBF4 in binary solvent mixture of PC:DMF in (1:1) and (2:1) volume ratios respectively. The dispersion of nano-sized silica in gel polymer electrolyte not only exhibits small change in ionic conductivity but also enhances the mechanical strength as well as viscosity of gel polymer electrolytes. At room temperature, the ionic conductivity has been found to be 8.00 mS/cm for 6 wt% nano-sized silica in GPEs. Fourier-transform infrared (FTIR) spectroscopic studies have been used to scrutinize the corroboration of the complexation between PMMA, LiBF4, PC, DMF, PC:DMF, and SiO2. The interactions between salt and solvents in liquid electrolytes have also been analyzed by FTIR spectroscopy illustrating the strong interaction between lithium salt and solvent molecules. The appearance/disappearance and shifting of some peaks confirm the interaction among the constituents of nano-dispersed gel polymer electrolytes. The mechanical strength was confirmed by dynamic mechanical analysis (DMA) and viscosity [ηPC:DMF (2:1) > ηPC:DMF (1:1) > ηPC] for nano-dispersed silica-based gel polymer electrolytes. The electrical and mechanical stability with high ionic conductivity for such gel polymer electrolytes makes these electrolytes suitable for many device applications like high energy density lithium-ion batteries, super-capacitors, electro-chromic devices etc.
Bookmarks Related papers MentionsView impact
Polymer Bulletin, 2021
Gum acacia (GA) based gel electrolyte was cross-linked with polyvinyl alcohol (PVA) in the presen... more Gum acacia (GA) based gel electrolyte was cross-linked with polyvinyl alcohol (PVA) in the presence of different concentrations of NaOH salt for the preparation of stable, biodegradable and saprophyte-free gel matrix, and characterized them with ionic conductivity, pH, FTIR and TGA studies. The maximum ionic conductivity (σ = 4.39 mS/cm at 30 °C) has been observed for GA-PVA based gel electrolyte containing lower concentration of NaOH salt and the analyte reaches toward neutral pH region as compared to acidic nature of gum acacia-based gel electrolyte in deionized water having ionic conductivity of 4.99 mS/cm at 30 °C. Physical cross-linking for better jellification has been analyzed through FTIR and thermogravimetric analysis (TGA). FTIR spectra of GA-PVA based gel electrolyte indicate the stability of the gel matrix at nearly neutral pH region and undergo complex decomposition with the influence of higher salt concentrations. Thermal stability and thermal behavior of gel electrolytes were investigated under non-isothermal conditions by thermogravimetric analysis and differential thermogravimetry (DTG), and the obtained results exhibit variations in the glass transition temperature (Tg) suggesting the miscibility of the compositions and also support the existence of compatibility of such system. Gel electrolyte with suitable composition indicates better stability near neutral pH region and small change in ionic conductivity over the temperature range of 10–70 °C make them suitable and applicable for many solid-state ionic device applications.
Bookmarks Related papers MentionsView impact
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European Polymer Journal, 2003
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Solid State Ionics, 2000
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