Abstract
Changes in the surface plasmon resonance (SPR) of a 45 nm thick gold film, thermally evaporated onto one face of a BK7 glass prism, have been used to detect nitrogen dioxide (NO2). The intensity of the reflected light decreases linearly with the concentration of gas, the change being 0.1% per 1 ppm of NO2 with a response time of ~30 s for adsorption and 30–40 s for desorption. The process is highly selective and other gases, e.g. NH3, H2, CO, CO2, SO2, HCl, Cl2 and H2S, have little or no noticeable effect on the SPR at concentrations of 100 ppm. It is also reversible by flushing with air and the NO2 sensor showed only a 10% deterioration in the SPR response after 1500 adsorption/desorption cycles.
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