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Acta Phys. -Chim. Sin.  2017, Vol. 33 Issue (5): 1010-1016    DOI: 10.3866/PKU.WHXB201702102
Article     
Potential-Induced Phase Transition of N-Isobutyryl-L-cysteine Monolayers on Au(111) Surfaces
CHEN Ai-Xi1, WANG Hong2, DUAN Sai3, ZHANG Hai-Ming1, XU Xin4, CHI Li-Feng1
1 Institute of Functional Nano&Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, Jiangsu Province, P. R. China;
2 Physikalisches Institut, Universität Münster, Wilhelm-Klemm Strasse 10, 48149 Münster, Germany;
3 Department of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden;
4 Department of Chemistry, Fudan University, Shanghai 200433, P. R. China
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Abstract  

Functional solid substrates modified by self-assembled monolayers (SAMs) have potential applications in biosensors, chromatography, and biocompatible materials. The potential-induced phase transition of N-isobutyryl-L-cysteine (L-NIBC) SAMs on Au(111) surfaces was investigated by in-situ electrochemical scanning tunneling microscopy (EC-STM) in 0.1 mol·L-1 H2SO4 solution. The NIBC SAMs with two distinct structures (α phase and β phase) can be prepared by immersing the Au(111) substrate in pure NIBC aqueous solution and NIBC solution controlled by phosphate buffer at pH 7, respectively. The as-prepared α phase and β phase of NIBC SAMs show various structural changes under the control of electrochemical potentials of the Au(111) in H2SO4 solution. The α phase NIBC SAMs exhibit structural changes from ordered to disordered structures with potential changes from 0.7 V (vs saturated calomel electrode, SCE) to 0.2 V. However, the β phase NIBC SAMs undergo structural changes from disordered structures (E < 0.3 V) to γ phase (0.4 V < E < 0.5 V) and finally to the β phase (0.5 V < E < 0.7 V). EC-STM images also indicate that the phase transition from the β phase NIBC SAMs to the α phase occurs at positive potential. Combined with density functional theory (DFT) calculations, the phase transition from the β phase to the α phase is explained by the potential-induced break of bonding interactions between ―COO and the negatively charged gold surfaces.



Key wordsSelf-assembly      Thiol      Phase transition      Potential-induced      Electrochemical scanning tunneling microscopy      Density functional theory     
Received: 19 December 2016      Published: 10 February 2017
MSC2000:  O647  
Fund:  

The project was supported by the National Natural Science Foundation of China (91227201, 21527805).

Corresponding Authors: ZHANG Hai-Ming, CHI Li-Feng     E-mail: hmzhang@suda.edu.cn;chilf@suda.edu.cn
Cite this article:

CHEN Ai-Xi, WANG Hong, DUAN Sai, ZHANG Hai-Ming, XU Xin, CHI Li-Feng. Potential-Induced Phase Transition of N-Isobutyryl-L-cysteine Monolayers on Au(111) Surfaces. Acta Phys. -Chim. Sin., 2017, 33(5): 1010-1016.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201702102     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2017/V33/I5/1010

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