Showing papers by "Sunkara V. Manorama published in 2000"
181 citations
TL;DR: In this article, a simple technique that does not need any explosive or high-energy reactions to obtain γ-Fe 2 O 3 was reported, which showed a linear response of sensitivity, in the range of 1-1000 ppm ethanol in air, in a logarithmic scale.
36 citations
TL;DR: In this article, a semiconductor gas sensor using tin dioxide along with palladium and lanthanum oxide was found to exhibit high sensitivity and selectivity to hydrogen in air compared to liquefied petroleum gas, carbon monoxide, methane, hydrogen sulfide, and ammonia at room temperature.
Abstract: A semiconductor gas sensor using tin dioxide along with palladium and lanthanum oxide was found to exhibit high sensitivity and selectivity to hydrogen in air compared to liquefied petroleum gas, carbon monoxide, methane, hydrogen sulfide, and ammonia at room temperature. The choice of La 2 O 3 and the noble metal additive and their exact loading were very critical for the detection of hydrogen. 0.5 wt % Pd and 2 wt % La 2 O 3 in tin dioxide was the optimized composition for maximum sensitivity to hydrogen at room temperature.
31 citations
TL;DR: In this paper, the authors investigated the possible chemical species involved in the gas-solid interaction and enhancing mechanism of the Pd-doped SnO 2 sensor element and found that the electronic mechanism is more predominant than the chemical mechanism.
21 citations
TL;DR: In this article, the influence of loading of La2O3 loading on the structural and gas sensing properties of SnO2 have been studied The effect of different weight percentages of La 2O3 (1-10 wt%) in SnO 2, and the effect of calcination temperature on the sensitivity to various reducing gases like LPG, H2 and CH4 has been studied.
Abstract: Influence of La2O3 loading on the structural and gas sensing properties of SnO2 have been studied The effect of different weight percentages of La2O3 (1–10 wt%) in SnO2, and the effect of calcination temperature on the sensitivity to various reducing gases like LPG, H2 and CH4 has been studied The structural characteristics have been investigated by X-ray diffraction, and the corresponding crystallite size estimated In addition to the systematic variation in the crystallite size as a function of the sintering temperature, the role of La2O3 as an effective grain growth inhibitor has been confirmed Increasing the percentage of La2O3 above 2 wt% has no added advantage in terms of improving the gas sensing characteristics and also in stabilizing the SnO2 surface Once the La2Sn2O7 formation temperature is reached, the sensitivity of the sensor decreases marginally At this temperature the crystallite size also increases very abruptly All these have been correlated with the formation of the La2Sn2O7, a new phase with standard pyrochlore structure
11 citations