کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5423702 | 1507949 | 2010 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
CO adsorption on clean and oxidized Pt3Ti(111)
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
High resolution electron energy loss spectroscopy (HREELS)Titanium oxide - اکسید تیتانیوم CO adsorption - جذب COAuger Electron Spectroscopy (AES) - طیف الکترونی آئور (AES)Thermal desorption spectroscopy (TDS) - طیف سنجی جذب حرارت (TDS)Low energy electron diffraction (LEED) - پراش الکترونی پایین (LEED)
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
CO adsorption on clean and oxidized Pt3Ti(111) surfaces has been investigated by means of Auger Electron Spectroscopy (AES), Thermal Desorption Spectroscopy (TDS), Low Energy Electron Diffraction (LEED) and High Resolution Electron Energy Loss Spectroscopy (HREELS). On clean Pt3Ti(111) the LEED patterns after CO adsorption exhibit either a diffuse or a sharp c(4Â ÃÂ 2) structure (stable up to 300Â K) depending on the adsorption temperature. Remarkably, the adsorption/desorption behavior of CO on clean Pt3Ti(111) is similar to that on Pt(111) except that partial CO decomposition on Ti sites and partial CO oxidation have also been evidenced. Therefore, the clean surface cannot be terminated by a pure Pt plane. Partially oxidized Pt3Ti(111) surfaces (<Â 135Â L O2 exposure at 1000Â K) exhibit a CO adsorption/desorption behavior rather similar to that of the clean surface, showing again a c(4Â ÃÂ 2) structure (stable up to 250Â K). Only the oxidation of CO is not detectable any more. These results indicate that some areas of the substrate remain non-oxidized upon low oxygen exposures. Heavily oxidized Pt3Ti(111) surfaces (>Â 220Â L O2 exposure at 1000Â K) allow no CO adsorption indicating that the titanium oxide film prepared under these conditions is completely closed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 604, Issues 19â20, September 2010, Pages 1637-1644
Journal: Surface Science - Volume 604, Issues 19â20, September 2010, Pages 1637-1644
نویسندگان
Séverine Le Moal, Marco Moors, Jan Markus Essen, Conrad Becker, Klaus Wandelt,