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Adsorption of carbon monoxide on Pt (335) and (112) stepped surfaces has been investigated by the extended LEPS (London-Eryring-Polanyi-Sato) method which is constructed by the 5-parameter Morse Potential. The calculated results show there have common characteristics of CO adsorption on the two surfaces. On both Pt (335) and (112) stepped surfaces, CO molecules adsorb on the step top site initially. With the coverage increasing, CO molecules diffuse from the step top sites to the stable terrace bridge sites and the terrace top sites sequentially. However, the step bridge site only corresponds to a transition state on the two surfaces. The predictions for vibrational frequency are in good agreement with the experimental results.

Electrophoretic assembly of porous silicon (PS) has been studied in the present paper. A toluene/porous silicon suspension was prepared by the sonication of anodically etched porous silicon wafers and showed a PL property similar to the as-prepared PS, giving 620nm orange-red photoluminescence emissions. A broad optical absorption band about 286nm arising from scattering and absorption of the light by the PS particles has been observed. The PS particles suspended in toluene drifted towards the positive electrode and have been assembled on the surface of P + Si or indium-tin oxide (ITO) electrodes under a electric field of 100~600V/cm. The assembled PS films showed a quite stable PL property after ageing for 280 days even though there were some oxides revealed by XPS analysis.