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We demonstrate how to establish reliable contacts to SnO2 nano-wires by growing these nano-wire on-chip on gold contacts deposited on alumina. The sensor device is used to sense the concentrations of acetone and ethanol in air and their reaction kinetics. Acetone molecules have higher adsorption and desorption rates on SnO2 nanowires than ethanol molecules which leads to a lower critical acetone concentration...
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