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Patil L.A.,Nanomaterials Research Laboratory
Technical Proceedings of the 2011 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2011 | Year: 2011

Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500°C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO(Pt-ZnO) films was tested on exposure of CWA (chemical warfare agents) simulants, such as, dimethyl methyl phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt-ZnO films showed higher response to DMMP than the responses to CEES and CEPS. Enhanced oxygen adsorption capability due to surface platinum would be the reason of higher response and good selectivity to DMMP. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the simulant sensing performance is discussed. Source


Deo V.V.,Nanomaterials Research Laboratory | Patil D.M.,Nanomaterials Research Laboratory | Patil L.A.,Nanomaterials Research Laboratory | Kaushik M.P.,Defence Research and Development Establishment
Sensors and Actuators, B: Chemical | Year: 2014

The nanostructured CdSnO3 thin films with particle size smaller than 5 nm were prepared by simple and cost effective ultrasonic spray pyrolysis (USP) technique. The structure, morphology and thickness of the films were analyzed by using XRD, SEM/EDS, TEM and Surface profiler. Experimental conditions were carefully optimized. Thin film based sensors were fabricated. The sensors were observed to be highly sensitive and selective toward VOC (volatile organic compound) - 100 ppm of isopropanol vapors (S = 35,463) at 300 C. Such a high isopropanol vapor response at relatively low temperature is an important finding of present investigation. Results are interpreted and discussed. © 2014 Published by Elsevier B.V. Source


Patil L.A.,Nanomaterials Research Laboratory | Bari A.R.,Nanomaterials Research Laboratory | Shinde M.D.,Nanomaterials Research Laboratory | Deo V.,Nanomaterials Research Laboratory | Kaushik M.P.,Defence Research and Development Establishment
Sensors and Actuators, B: Chemical | Year: 2012

Nanocrystalline ZnO powder was prepared using ultrasonic atomization technique. Thick films of this powder were prepared using simple screen printing technique. Pt-modified-ZnO (platinum activated) films were obtained by dipping pure ZnO films into an aqueous solution of chloroplatnic acid for different intervals of time, followed by firing at 500 °C for 30 min. The sensing performance of the unmodified (pure) and Pt-modified ZnO (Pt-ZnO) films was tested on exposure of CWAs (chemical warfare agents) simulants, such as, dimethyl methyl phosphonate (DMMP), 2-chloroethyl ethyl sulfide (CEES) and 2-chloroethyl phenyl sulfide (CEPS). Both pure ZnO and Pt-ZnO films showed higher response to DMMP than their responses to CEES and CEPS. The simulant response, selectivity, response time and recovery time of the sensors were measured and presented. The role played by surface platinum species in the better simulant sensing performance is discussed. © 2011 Elsevier B.V. All rights reserved. Source


Patil L.A.,Nanomaterials Research Laboratory | Deo V.V.,Nanomaterials Research Laboratory | Shinde M.D.,Nanomaterials Research Laboratory | Bari A.R.,Nanomaterials Research Laboratory | Kaushik M.P.,Defence Research and Development Establishment
Sensors and Actuators, B: Chemical | Year: 2011

Nanostructured perovskite CdSnO3 and Pt-CdSnO3 thin films were prepared using ultrasonic spray pyrolysis technique. The nozzle (driven by ultrasonic frequency of 120 kHz) fixed on microprocessor controlled motorized arm could move in X-Y direction and spray onto heated (300 °C) glass substrate to give the films of repeatable thickness and microstructure. Structural and microstructural properties of the films were studied using X-ray diffraction and transmission electron microscopy (TEM), respectively. The sensing performance of the films was tested for CWA simulants, such as, CEES (2-chloroethyl ethyl sulfide C4H9ClS), DMMP (dimethyl methyl phosphonate C3H9O3P) and CEPS (2-chloroethyl phenyl sulfide C8H9ClS). Both CdSnO 3 and Pt-CdSnO3 showed higher response, better selectivity and faster speed of response to CEES as compared to their responses of DMMP and CEPS. CEES response of Pt-CdSnO3 is larger than the response of CdSnO3. The results are discussed and interpreted. © 2011 Elsevier B.V. All rights reserved. Source


Patil L.A.,Nanomaterials Research Laboratory | Shinde M.D.,Nanomaterials Research Laboratory | Bari A.R.,Nanomaterials Research Laboratory | Deo V.V.,Nanomaterials Research Laboratory | And 2 more authors.
Sensors and Actuators, B: Chemical | Year: 2011

Nanostructured hollow spheres of SnO2 with fine nanoparticles were synthesized by ultrasonic atomization. Thick film gas sensors were fabricated by screen printing technique. Different surface modified films (Fe2O3 modified SnO2) were obtained by dipping them into an aqueous solution (0.01 M) of ferric chloride for different intervals of time followed by firing at 500 °C. The structural and microstructural studies of the samples were carried out using XRD, SEM, and TEM. The sensing performance of pure and modified films was studied by exposing various gases at different operating temperatures. One of the modified sample exhibited high response (1990) to 1000 ppm of LPG at 350 °C. Optimum amount of Fe2O3 dispersed evenly on the surface, adsorption and spillover of LPG on Fe2O3 misfits and high capacity of adsorption of oxygen on nanostructured hollow spheres may be the reasons of high response. © 2010 Elsevier B.V. All rights reserved. Source

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