کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5426464 1395889 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dehydrogenation of oligo-phenylenes on gold surfaces
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Dehydrogenation of oligo-phenylenes on gold surfaces
چکیده انگلیسی

Adsorption of oligo-phenylenes (p-quaterphenyl (p-4P), p-sexiphenyl (p-6P)) on various gold surfaces has been investigated under ultrahigh vacuum conditions. X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED) and thermal desorption spectroscopy (TDS) have been applied to study the adsorbates. We have focused on the dehydrogenation of the organic molecules during thermal desorption. Whereas p-4P exhibits only a small tendency to dehydrogenate on the flat Au(1 1 1) surface, the degree of dehydrogenation on a stepped Au(4 3 3) surface or on a polycrystalline Au surface is considerable. Interestingly, p-6P shows already a strong dehydrogenation even on the flat Au(1 1 1) surface. Dehydrogenation takes place in two successive steps. The first partial dehydrogenation appears at the trailing edge of the oligo-phenyl desorption spectrum. Parallel to that stable polycyclic aromatic hydrocarbons (PAH) are formed on the surface, which eventually dehydrogenate completely at higher temperatures around 850 K. Pure carbon remains on the surface in form of a graphite like layer.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 600, Issue 18, 15 September 2006, Pages 3982-3986
نویسندگان
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