Adsorption and Electron-Induced Dissociation of Ethanethiol on Au(111)

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• 作者：Fangsen Li ; Lin Tang ; Jianzhi Gao ; Wancheng Zhou ; Quanmin Guo
• 刊名：Langmuir
• 出版年：2012
• 出版时间：July 31, 2012
• 年：2012
• 卷：28
• 期：30
• 页码：11115-11120
• 全文大小：566K
• 年卷期：v.28,no.30(July 31, 2012)
• ISSN：1520-5827

文摘

Dissociation of ethanethiol and the formation of Au-adatom-diethylthiolate rows on the Au(111) surface were investigated using scanning tunneling microscopy (STM) at low temperature. Ethanethiol molecules physisorb on Au(111) at 120 K by sequentially occupation of the elbow site, the fcc domain before covering the whole surface with a semiliquid layer without long-range order. Scanning the physisorbed layer with a sample bias higher than +1.2 V leads to dissociation via cleaving the H鈥揝 bond. One of the dissociation products, ethylthiolate, forms a double-row structure with the rows aligned in one of the 112虆 directions. These double rows arise from the Au-adatom-dithiolate species: CH₃CH₂S鈥揂u鈥揝CH₂CH₃.