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The adsorption of hydrogen on Au nanoparticles (NPs) of size of the order of10 nm has been investigated by use of localised surface plasmon resonances(LSPR) in the NPs. The samples, formed by Au NPs obtained by oblique angledeposition on glass substrates, display a strong optical dichroism due to twodifferent plasmon resonances dependent on the polarisation of light. Thisensured the use of Transmittance Anisotropy Spectroscopy, a sensitivederivative optical technique, which permitted one to measure shifts of the LSPRas small as 0.02 nm upon H adsorption, which is not accessible by conventionalplasmonic methods. The measured signal is proportional to the area of the NPs,which shows that H atoms diffuse on their facets. A negative charge transferfrom Au to H is clearly demonstrated

Mechanism of hydrogen adsorption on gold nanoparticles and charge transfer probed by anisotropic surface plasmon resonance