The oscillatory change in the optical absorbance of NiO-TiO2 film containing Au
nanoparticles in the presence of H2S gas are investigated. The oscillatory phenomena could be
monitored by looking at the variation of the surface plasmon resonance peak of the Au
nanoparticles embedded in the TiO2-NiO matrix. Au nanoparticles act as optical probes in the
detection of H2S, while the oxide matrix is responsible for the catalytic oxidation of H2S. To the
best of our knowledge, it is the first time that oscillatory phenomena are monitored by optical
spectroscopy.
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