Abstract
Sensitivity mechanism of mercury ion microsensors based on AgBr–Ag 2S–As 2S 3 thin films has been investigated using 110 Ag tracer exchange experiments, X-ray photoelectron spectroscopy (XPS) and secondary neutral mass spectroscopy (SNMS). It was found that non-linear sensor response in Hg(NO 3) 2 solutions is caused by at least two principal potential-generating processes: (i) Hg 2+ to Ag + ion exchange, and (ii) chemical reactions at the membrane surface involving silver and mercury species.
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