J. Wnuk, J. Gorham, S. G. Rosenberg
Jan 21, 2009
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Journal of Physical Chemistry C
Abstract
The effect of 500 eV electrons on nanometer scale thick films of trimethyl(methylcyclopentadienyl)platinum(IV) (MeCpPtIVMe3), were studied in situ, under ultrahigh vacuum conditions using a combination of temperature-programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), mass spectrometry, and reflection absorption infrared spectroscopy. TPD results revealed the presence of a monolayer state, with a desorption energy >10 kJ mol−1 larger than the multilayer. XPS data indicate that electron beam induced decomposition of adsorbed MeCpPtIVMe3 produced a carbonaceous film that contained Pt atoms in an electronic state intermediate between metallic Pt and Pt(IV). In addition to Pt(IV) reduction, electron beam irradiation was also accompanied by the evolution of methane and hydrogen from the adsorbate layer and the loss of C−H groups. The rate of Pt(IV) reduction and methane production and the loss of C−H groups from the film were all proportional to the MeCpPtIVMe3 coverage and the incident electr...