How Sulfur Controls Nucleation of Ag Islands on Ag(111)

作者：Shen Mingmin; Jenks Cynthia J^*; Evans J W; Thiel P A

来源：Topics in Catalysis, 2011, 54(1-4): 83-89.

DOI：10.1007/s11244-011-9627-8

• Hydrodesulfurization
• Sulfur
• Silver
• Ag(111)
• Scanning tunneling microscopy
• STM

Pre-adsorbed sulfur controls nucleation of Ag islands on Ag(111), at coverages above a very small critical value. Sulfur can exert opposite effects: it accelerates mass transfer of Ag to steps and hence inhibits nucleation under some conditions, but it impedes mass transfer and hence enhances nucleation under others. The effect depends upon sulfur coverage and temperature. The inhibition or acceleration of mass transfer correlates with the existence or absence of a semi-static, ordered arrangement of Ag(3)S(3) clusters.

• 出版日期2011-3