Precursor Adsorption of SbBr3 on Au(111) and Au(100) for Antimony Underpotential Deposition in a BMIBF4 Ionic Liquid – A Comparison with SbCl3
Precursor Adsorption of SbBr3 on Au(111) and Au(100) for Antimony Underpotential Deposition in a BMIBF4 Ionic Liquid – A Comparison with SbCl3
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DOI：
10.1524/zpch.2007.221.9-10.1109
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发表时间：
2007-10
期刊：
影响因子：
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通讯作者：
Yongchun Fu;Haiming Zhang;Yu-Zhuan Su;Depeng Wu;Zhaoxiong Xie;B. Mao
中科院分区：
文献类型：
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作者：
Yongchun Fu;Haiming Zhang;Yu-Zhuan Su;Depeng Wu;Zhaoxiong Xie;B. Mao
利用STM原位研究了在含SbBr_3的BMIBF_4离子液体中，Sb在Au（111）和Au（100）表面上的吸附和UPD的初始阶段。与SbCl_3相反，SbBr_3选择性地吸附在Au（100）上，形成链状结构和正方形结构。链由成对的SbBr 3分子组成，它们与链中相邻的SbBr 3分子桥接以形成沿Au（100）的两个特征方向之沿着的各向异性。SbBr 3的单聚体和二聚体周期性排列形成正方形结构，并逐渐取代链状结构。然而，无论前体吸附，Sb UPD的初始阶段的特征在于形成原子条带，如在含SbCl 3的系统中，这揭示了Sb（III）从SbCl 3和SbBr 3分子的放电行为的一致性。连同从SbCl 3-含系统的调查结果，结果进行了讨论，鉴于金字塔的三卤化锑和晶体表面之间的结构匹配。离子液体的作用以及带电界面的性质也将被提及。
By employing in-situ STM, we have studied precursor adsorption and initial stage of Sb UPD on Au(111) and Au(100) in a SbBr3-containing BMIBF4 ionic liquid. It has been observed that the adsorption of SbBr3 selectively takes place on Au(100), in contrast to that of SbCl3, with formation of chains with structure as well as squares with structure. The chains are composed of pairs of SbBr3 molecules, which are bridged with the adjacent SbBr3 molecules in the chain to form the anisotropy along either of the two characteristic directions of Au(100). The square configured structure is composed of periodically arranged monomeric and dimeric SbBr3, which will gradually replace the chain structure. Regardless of the precursor adsorption, however, the initial stage of Sb UPD is characterized by the formation of atomic strips, like in the SbCl3-containing system, which reveals the consistency of discharging behavior of Sb(III) from the SbCl3 and SbBr3 molecules. Together with the findings from the SbCl3-containing system, the results are discussed in view of matching of structures between the pyramidal antimony tri-halides and the crystalline surfaces. The role of the ionic liquid as well as properties of the electrified interface will also be mentioned.