The electrodeposition of AuBr4- and PtBr42- onto an adlayer of circobiphenyl-a structurally defined nanographene with low symmetry-on a Au(111) electrode was investigated via electrochemical scanning tunneling microscopy (EC-STM) to control and understand the formation of characteristic nanoclusters. By immersing a circobiphenyl-coated Au(111) substrate in a 0.1 mM aqueous AuBr4- solution, AuBr4- was spontaneously reduced, and a characteristic mixed adlayer consisting of circobiphenyl molecules and Br- ions with monatomic Au islands was produced on the Au(111) surface. A similar electrodeposition process was performed in an aqueous solution of PtBr42-, and an identical mixed adlayer was obtained with Pt nanoclusters. The electrodeposition of Au and Pt complexes was facilitated by the "negatively charged" reconstructed Au(111) surface, which is stabilized by the formation of a highly ordered circobiphenyl adlayer. EC-STM revealed the formation of characteristic dimers of Pt clusters ranging 2-4 nm in diameter on the circobiphenyl adlayer. Thus, Br- metal complexes were found to play an important role in controlling the structure and size of a mixed adlayer containing Br- and the shape of Pt clusters.

中文翻译：

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通过电沉积金属卤化物络合物在Au（111）上调节2D纳米石墨烯添加剂。

通过电化学扫描隧道显微镜（EC-STM）研究了AuBr4-和PtBr42-在Circbibiphenyl-一种结构对称的纳米石墨烯（Au（111））的电极上电沉积AuBr4-和PtBr42-的方法，以控制和理解特征性纳米团簇的形成。通过将涂有环联苯的Au（111）衬底浸入0.1 mM的AuBr4-水溶液中，自发还原AuBr4-，并在Au（111）上制备了由环联苯分子和Br-离子与单原子Au岛组成的特征混合掺合物） 表面。在PtBr42-的水溶液中进行了类似的电沉积过程，并用Pt纳米团簇获得了相同的混合吸附层。“负电荷”重构的Au（111）表面促进了Au和Pt配合物的电沉积，它通过形成高度有序的环联苯吸附剂而稳定。EC-STM揭示了在环联苯吸附层上形成直径范围为2-4 nm的Pt团簇的特征性二聚体。因此，发现Br-金属络合物在控制含有Br-的混合吸附层的结构和尺寸以及Pt簇的形状方面起着重要作用。