| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2004: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2003: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Research Abstract |
The purpose of this study is to realize the platinum nitride which cannot be constructed by usual way. When nitric oxide (NO) adsorbed on Pt(111) is irradiated by ultra-violet (UV) light or electron, it is suggested to be dissociated. For this purpose the adsorption and desorption of NO on Pt(111), and the desorption/dissociation by UV or electron irradiation was studied.
In spite of the catalytic ability of Pt, NO cannot be dissociated on Pt(111), it just adsorbs at low temperature and desorbs by heating. When the NO coverage is increased, NO first adsorbs on the 3-fold fcc hollow site, next on the 1-fold atop site and last on the 3-fold hcp hollow site. The adsorption energy was obtained from the desorption peak in the thermal desorption spectra (TDS). The interaction between the NO species adsorbed on the different sites was precisely studied by using the NO isotopes, 14NO and 15NO. The adsorption structure was observed by the scanning tunneling microscopy (STM) and the effect of electron irradiation was studied by electron injection from the STM tip.
The NO species on the atop site can be desorbed by the electron irradiation from the STM tip, while the NO species on the fcc hollow site is suggested to be dissociated by the electron irradiation above 15 eV. The STM observation after irradiation revealed many small corrugation, which is suggested to be the dissociated products of NO. The occupation of the hcp hollow site by NO species, though its adsorption energy is very small, affects the diffusion of NO on the fcc hollow and atop sites. It is suggested that the activity of NO on the P1(111) can be controlled by the occupation of hcp hollow site by NO.
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