P2.4.9 Synthesis of Au/SnO2 core-shell NPs with thick shell and their CO sensing properties in low temperatures
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Au/SnO2 core-shell structure nanoparticles (NPs) with different shell thicknesses as a CO gas sensing material were synthesized by microwave-assistant hydrothermal method. The thickness of SnO2 shell was controlled from 7 nm to 22 nm. The concentrated Au/SiO2 NPs colloid was loaded on alumina circuit board with interdigitated Pt electrodes for gas sensing test, and then heat-treated 500°C in electric furnace for 24 h. The sensor device showed the highest response for CO gas when the thickness of SnO2 shell was 18 nm and the test temperature was 200°C. This sensor device showed high response even at 100°C of test temperature.The PbS films have been prepared by CMD, and the surface morphology of which is showed, performance and experiment in hydrothermal environment(50±2℃, relative humidity≥95%) are specified. The performances of Pb S photoconductive detectors in hydrothermal environment are analysed, which have not been influenced in hydrothermal environment for 1 h. The Rd has increased by 50% in hydrothermal environment for 24 h, and the average increment of Pb S detector is in direct proportion to the time of hydrothermal environment after 2×24 h、3×24 h、4×24 h、5×24 h. Some samples have been failed after 7×24 h in hydrothermal environment.
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