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Khetre S.M.,Dahiwadi College Dahiwadi
Sensors and Transducers | Year: 2013

The characterization and ethanol gas sensing properties of nanoporous LaFeO3 thick films were investigated. Thick films of LaFeO3 were prepared by the screen printing technique. Thick films of nanoporous LaFeO3 were observed to be highly sensitive to ethanol vapours at 300 °C. Upon exposure of ethanol vapours, the barrier height would decrease greatly leading to drastic increase in conductance. It is reported that the surface misfits and operating temperature can affect the microstructure and gas sensing performance of the sensor. The quick response and fast recovery are the main features of this sensor. The effects of microstructure and additive concentration on the gas response, selectivity, response time and recovery time of the sensor in the presence of ethanol vapours were studied and discussed. © 2013 IFSA. Source


Khetre S.M.,Dahiwadi College Dahiwadi
Journal of Materials Science: Materials in Electronics | Year: 2013

Nanocrystalline CrFeO3 with particle size of about 83 nm was directly synthesized by sol-gel auto-combustion method at room temperature. The overall process involves three steps: formation of homogeneous sol; formation of dried gel; and combustion of the dried gel. Experiments revealed that CrFeO3 dried gel derived from glycine and nitrate sol exhibits self-propagating combustion at room temperature once it is ignited in air. After auto-combustion, the desired nanocrystalline CrFeO3 was acquired and no further calcination was needed. The auto-combustion was considered as a heat-induced exothermic oxidation-reduction reaction between nitrate ions and carboxyl group. The synthesized powder was characterized by XRD, TG/DTA, IR spectroscopy, SEM and TEM. Nanocrystalline CrFeO3 was p type semiconducting material. Shapes of the particles are nanocoralloids in nature. The superhydrophilicity of the mixed oxide investigated by wetting experiments, by the sessile drop technique were carried out room temperature in air to determine the surface and interfacial interactions. The I-V characteristic and electrical properties of the nanocrystalline CrFeO3 were studied. © 2012 Springer Science+Business Media, LLC. Source


Jadhav H.V.,Kisan Veer Mahavidyalaya | Jadhav S.G.,Shri Shivaji Mahavidhylaya | Khetre S.M.,Dahiwadi College Dahiwadi
Journal of Materials Science: Materials in Electronics | Year: 2014

Nanocrystalline Cu0.5Ni0.5Ce3O5 with particle size of about 28 nm was directly synthesized by sol–gel auto-combustion method at room temperature. The overall process involves three steps: formation of homogeneous sol; formation of dried gel; and combustion of the dried gel. Experiments revealed that Cu0.5Ni0.5Ce3O5 dried gel derived from glycine and nitrate sol exhibits self-propagating combustion at room temperature once it is ignited in air. After auto-combustion, the desired nanocrystalline Cu0.5Ni0.5Ce3O5 was acquired and further calcination was needed. The auto-combustion was considered as a heat-induced exothermic oxidation–reduction reaction between nitrate ions and carboxyl group. The synthesized powder was characterized by XRD, TG/DTA, SEM and TEM. Nanocrystalline Cu0.5Ni0.5Ce3O5 was p type semiconducting material. Shapes of the particles are nanocoralloids in nature. The I–V characteristic and electrical properties of the nanocrystalline Cu0.5Ni0.5Ce3O5 were studied. © 2014, Springer Science+Business Media New York. Source


Khetre S.M.,Dahiwadi College Dahiwadi | Jadhav H.V.,Kisanveer Mahavidhyala | Bamane S.R.,Dr. Patangrao Kadam Mahavidhyala Sangali
Rasayan Journal of Chemistry | Year: 2010

Orthorhombic structure perovskite Lafeo3 nanocrystalline with size ~27 nm were prepared by glycine combustion method. The prepared Lafeo3 nanocrystals were characterized by TG-DTA thermal analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic fluorescence microscopy (AFM) and Brunauer Emmett Teller (BET) nitrogen absorption. The Lafeo3 nanocrystals are more attractive in the field of catalytic application and process can be applied to prepared more other oxide nanocrystals such as LaCrO3, LaMnO3 etc. Source


Khetre S.M.,Dahiwadi College Dahiwadi | Khilare C.J.,Dahiwadi College Dahiwadi | Shivankar V.S.,Modern College Vashi | Bamane S.R.,Metal Oxide Research Laboratory
Sensors and Transducers | Year: 2012

The preparation, characterization and gas sensing properties of pure nanocrystalline LaCrO 3 mixed oxide semiconductors have been investigated. The mixed oxides were obtained by mixing lanthanum nitrate, chromium nitrate and glycine in the 1:1:2 proportions respectively. Synthesized materials were characterized by X-ray diffraction (XRD), Infrared spectroscopy (IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). LaCrO 3 was observed to be sensitive to acetone gas. Upon exposure to acetone gas, the barrier height of LaCrO 3 intergranular regions decreases markedly due to the chemical transformation of LaCrO 3 into well conducting electrons leading to a drastic decrease in resistance. The crucial gas response 200 ppm was found to acetone gas at 200°C and no cross response was observed to other hazardous and polluting gases. The effects of microstructure on the gas response, selectivity, response and recovery of the sensor in the presence of acetone gas were studied and discussed. © 2012 IFSA. Source

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