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In addition, a shift in the SPR band position was observed in the case of H2 exposure, which was not found for CO, thus indicating a different detection mechanism for the two species. The wavelength dependence of OTCR has be exploited to tailor the film’s selectivity towards the detection of H2 with reduced CO interference. For a film containing 6% Au and at 570 nm wavelength, H2 was detected by monitoring the transmittance change, while for CO the change was negligible.