Citation: 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[J]. Acta Physico-Chimica Sinica, ;2017, 33(5): 1010-1016. doi: 10.3866/PKU.WHXB201702102 shu

Potential-Induced Phase Transition of N-Isobutyryl-L-cysteine Monolayers on Au(111) Surfaces

CHEN Ai-Xi ^1, ,
WANG Hong ² ,
DUAN Sai ³ ,
ZHANG Hai-Ming ¹ ,
XU Xin ⁴ ,
CHI Li-Feng ¹

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

Received Date: 19 December 2016
Revised Date: 10 February 2017

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

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.
- Self-assembly,
- Thiol,
- Phase transition,
- Potential-induced,
- Electrochemical scanning tunneling microscopy,
- Density functional theory
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