Sulfur adsorption on Au(100): XPS, LEED and STM study

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/60730

Title:	Sulfur adsorption on Au(100): XPS, LEED and STM study
Authors:	江岳;Jiang,Yue
Contributors:	物理學系
Keywords:	掃描穿隧顯微鏡;低能量電子繞射;X-ray 光電子能譜;Scanning Tunneling Microscopy;Low Energy Electron Diffraction;X-ray Photoemission Spectroscopy
Date:	2013-07-23
Issue Date:	2013-08-22 11:47:01 (UTC+8)
Publisher:	國立中央大學
Abstract:	在本論文中，我們在超高真空的環境下，透過固態電化學的方式產生硫分子（S2）氣體，使其吸附於金(100)表面上，並利用X光光電子能譜術、低能量電子繞射、掃描穿隧顯微鏡來研究硫在金(100)上隨溫度的結構變化。當硫在室溫下的覆蓋率達到飽和時，由低能量電子繞射觀察到c(4x2)的重構，同時由X光光電子能譜術量測到三種不同硫的電子態。經過加熱至不同溫度後，除了電子態的變化外，隨著覆蓋率的降低，也依序觀察到c(4x4)與(6x6)的共存態、(6x6)、c(2x2)與(2x2)共存態、(2x2)等重構，直到加熱至550℃時可觀察到乾淨金(100)表面(5x20)之重構，顯示硫已從表面完全脫附（desorption）。硫在不同溫度下的重構，也經由掃描穿隧顯微鏡得到其原子排列情形，而S 2p和Au 4f電子能譜也被量測及分析。根據這些結果，我們提出了各個重構可能的原子模型。 The temperature-dependent adsorption of S on a clean Au(100)- (5x20) surface has been studied with X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED), and scanning tunneling microscopy (STM), using a beam of S2 molecules generated by electrochemical decomposition of Ag2S. For the S adsorption at room temperature, a c(4x2) surface reconstruction is observed with LEED for saturation coverage, and the XPS study of S 2p from the S adlayer reveals the presence of three components. As the S coverage decreases during annealing, the surface undergoes a series of transformations, in the order of the coexistence of c(4x4) and (6x6), (6x6), coexistence of c(2x2) and (2x2) ,(2x2) the S adlayer desorbs completely at 550℃. Each reconstruction structure was investigated with STM, and the corresponding photoemission spectra of the S and Au core levels were measured and analyzed. Combining these results, the atomic models for the varied reconstructions were proposed.
Appears in Collections:	[Graduate Institute of Physics] Electronic Thesis & Dissertation

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