کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5365634 1388334 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pinning platinum and Pt-oxide nanoparticles on graphite
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Pinning platinum and Pt-oxide nanoparticles on graphite
چکیده انگلیسی

Nanoparticles of platinum oxide are deposited onto a highly oriented pyrolitic graphite (HOPG) substrate. The platinum oxide particles are formed by flowing oxygen gas through a hot (1425 K) platinum capillary tube in vacuum. By controlling the temperature and the gas flow, a condition can be reached so that Pt atoms are evaporated from the inner walls of the tube and subsequently oxidised by oxygen either before or after landing on HOPG. Atomic oxygen, produced inside the tube through thermal cracking of O2, is co-deposited onto HOPG. Atomic oxygen form strong bonds with carbon atoms on the HOPG surface and hence a significant number of pinning sites are created for the incoming platinum and platinum oxide particles.

► A thermal cracking source is used to co-deposit atomic oxygen and PtO nanoparticles on graphite. ► Atomic oxygen attached to surface carbon atoms serve as pinning site for incoming Pt and PtO. ► Highly-dispersed PtO nanoparticles are formed on the flat terraces of highly-oriented pyrolitic graphite surface.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 258, Issue 14, 1 May 2012, Pages 5412-5417
نویسندگان
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