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In order to investigate the effect of different facets on gas-sensing properties, we compare the gas-sensing performance between the gas sensors made from a-Fe2O3 nanocubes with dominant exposed {012} facets and a-Fe2O3 nanoplates with dominant exposed {001} facets. The nanocube-based gas sensor shows better gas-sensing performance than the nanoplate-based sensor. The difference in the gas-sensing...
The smuggling of liquid precursor chemicals greatly harms social public security. In this paper a method based on principal component analysis (PCA) is presented to recognize the EDXRS spectra of liquid precursor chemicals. Scatter profiles of acetone, acetic anhydride,2-butanone and isosafrole are obtained by using EDXRS. As the similarity of the profiles, it is difficult to identify samples, so...
A novel layer-packed In2O3 nanostructure and its application in gas sensor for the detection of indoor air contaminants were reported. The special In2O3 nanomaterials were prepared by annealing In2S3 precursors synthesized via a surfactant-assisted assembly route. The influencing factors towards the morphology of In2S3 precursors were also investigated. In gas-sensing measurements, typical indoor...
An effort has been made to develop a kind of CuO-doped SnO2 gas sensors for detecting trace amount of H2S gas at relative low temperature. The CuO-doped SnO2 hollow nanospheres are prepared from SnO2 hollow spheres (employing carbon nanospheres as temples) and Cu precursor by dipping method. The sensitivity and selectivity of the sensors based on the as-prepared CuO-doped SnO2 hollow nanospheres have...
To improve the selectivity of the gas sensor, a practical testing system for testing sensor array and discriminating gases in real-time has been developed. Based on the analysis of the temperature dependence characteristic of the semiconductor sensitive material electric conductivity, the hardware control circuit and the software design method of the testing system were discussed in details. According...
In this paper, we present a novel field ionization sensor designed for detecting formic acid in air that utilized ZnO nanorod arrays as anode, tungsten needle as cathode. Through applying a positive bias voltage to ZnO nanorod arrays, high local electric field is generated to ionize the detected gas (formic acid molecules) between the tips of ZnO nanorod arrays and tungsten needle. The experimental...
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