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Simple Synthesis of ZnCo2O4 Nanoparticles as Gas-sensing Materials

Sensor and Transducers 01/2011; 134:95-106.
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    ABSTRACT: The preparation, characterization and gas sensing properties of pure nanocrystalline LaCrO3 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). LaCrO3 was observed to be sensitive to acetone gas. Upon exposure to acetone gas, the barrier height of LaCrO3 intergranular regions decreases markedly due to the chemical transformation of LaCrO3 into well conducting electrons leading to a drastic decrease in resistance. The crucial gas response 200 ppm was found to acetone gas at 200 0C 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.
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