Tuning of 2D Nanographene Adlayers on Au(111) by Electrodeposition of Metal Halide Complexes
Tuning of 2D Nanographene Adlayers on Au(111) by Electrodeposition of Metal Halide Complexes
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DOI：
10.1021/acsami.9b15276
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发表时间：
2019-12-11
影响因子：
9.5
通讯作者：
Yoshimoto, Soichiro
中科院分区：
文献类型：
--
作者：
Ogata, Hiroto;Yoshimoto, Soichiro
通过电化学扫描隧道显微镜（ECSTM）研究了在Au(111)电极上具有低对称性的结构明确的纳米石墨烯环联苯吸附层上AuBr₄⁻和PtBr₄²⁻的电沉积，以控制和理解特征纳米团簇的形成。将涂有环联苯的Au(111)基底浸入0.1 mM的AuBr₄⁻水溶液中，AuBr₄⁻自发还原，在Au(111)表面上形成了由环联苯分子和Br⁻离子以及单原子Au岛组成的特征混合吸附层。在PtBr₄²⁻水溶液中进行了类似的电沉积过程，并获得了带有Pt纳米团簇的相同混合吸附层。Au和Pt配合物的电沉积因“带负电荷”的重构Au(111)表面而变得容易，该表面通过形成高度有序的环联苯吸附层而稳定。EC - STM揭示了在环联苯吸附层上形成了直径为2 - 4 nm的Pt团簇特征二聚体。因此，发现Br⁻ - 金属配合物在控制含有Br⁻的混合吸附层的结构和尺寸以及Pt团簇的形状方面起着重要作用。
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 (ECSTM) 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.