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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 proposed a novel non-invasive electronic nose for detection and diagnosis of lung cancer based on an electronic nose instrument which includes a gas extraction and capillary column to concentrate, desorb and separate volatile organic compounds (VOCs) in patientspsila breath, respectively. Surface Acoustic Wave (SAW) gas sensors was used to detect chemical compounds. The specific...
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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