Abstract
The nanocrystalline porous silicon was prepared by the electrochemical etching of Si in a HF solution. A semi-transparent palladium layer was thermally deposited on its surface. Micro-Raman spectra were recorded in air and in the presence of hydrogen. Different SiH X stretching and wagging vibrational modes, a SiH stretching mode modified by the presence of three oxygen atoms in the Si backbonds (O 3SiH unit) and a SiOSi vibration were readily revealed. Their behavior under laser irradiation and towards the hydrogen atoms dissociated from hydrogen molecules by palladium is reported.
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