Two-dimensional self-assembly of melem and melemium cations at pH-controlled aqueous solution–Au(111) interfaces under electrochemical control

doi:10.1007/s11705-016-1564-4

Frontiers of Chemical Science and Engineering

2016, Vol. 10

Issue (2): 294-300 https://doi.org/10.1007/s11705-016-1564-4

本期目录

Two-dimensional self-assembly of melem and melemium cations at pH-controlled aqueous solution–Au(111) interfaces under electrochemical control

Shinobu Uemura^1,^*(

),Kenki Sakata²,Masashi Aono²,Yusuke Nakamura²,Masashi Kunitake^2,^*(

)

¹. Department of Advanced Materials Sciences, Faculty of Engineering, Kagawa University, Kagawa 761-0396, Japan
². Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan

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Abstract：

Two-dimensional self-assembly of melem at pH-controlled aqueous solution-Au(111) interfaces has been investigated by electrochemical scanning tunneling microscopy. In the solutions with pH>pK_b1 of melem, two ordered self-assembled structures (honeycomb and close-packed structures) and one disordered fibrillar structure were observed as a function of the surface coverage of melem controlled by the electrode potential. In contrast, in the acidic solution with pH<pK_b1 of melem, only the self-assembled honeycomb network was observed in a relatively wide potential range probably due to the presence of monoprotonated melem cations. Dots attributed to counteranions were frequently observed in the pores of the honeycomb network. The lack of close-packed and fibrillar structures at low pH (<pK_b1) is attributed to ionic repulsion of melemium cations.

Key words： self-assembly scanning tunneling microscopy electrochemistry structural phase transition melem

收稿日期: 2015-12-19 出版日期: 2016-05-19

Corresponding Author(s): Shinobu Uemura,Masashi Kunitake

引用本文:

. [J]. Frontiers of Chemical Science and Engineering, 2016, 10(2): 294-300.
Shinobu Uemura,Kenki Sakata,Masashi Aono,Yusuke Nakamura,Masashi Kunitake. Two-dimensional self-assembly of melem and melemium cations at pH-controlled aqueous solution–Au(111) interfaces under electrochemical control. Front. Chem. Sci. Eng., 2016, 10(2): 294-300.

链接本文:

https://academic.hep.com.cn/fcse/CN/10.1007/s11705-016-1564-4
https://academic.hep.com.cn/fcse/CN/Y2016/V10/I2/294

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