ICCAS OpenIR
Potential-induced phase transition of trimesic acid adlayer on Au(111)
Su, GJ; Zhang, HM; Wan, LJ; Bai, CL; Wandlowski, T
2004-02-12
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
ISSN1520-6106
Volume108Issue:6Pages:1931-1937
AbstractPotential-induced phase transition of trimesic acid (TMA, C6H3(COOH)(3)) on a Au(111) electrode was investigated by in situ scanning tunneling microscopy (STM) and cyclic voltammetry. A pair of peaks, ascribed to structural transformation was observed in the cyclic voltammograms (CVs) of Au(111) in 0.1 M HClO4 + 0.1 mM TMA. The magnitude of the peaks decreased with increasing solution pH. On the basis of highresolution STM images in 0.1 M HClO4, it is proposed that TMA molecules assume a flat-lying and a vertical orientation at 0.25 and 0.85 V, respectively. The coexistence of the two orientations was observed at 0.65 V. The discovered adlayer phases could be represented by (4x4), (5x2root3), and (2root3x 4root3) or (7x2root3) structures. Intriguingly, it is found that TMA molecules bind on Au substrate with one and two deprotonated carboxyl groups with potential shifting, even though the molecules take the same vertical orientation. On the basis of the STM observation, structural models for various adlayers are proposed. Comparing the STM results with those of cyclic voltammetry, we conclude that the potential- induced phase transitions in 0.1 M HClO4 solution result from the interfacial deprotonation/protonation of the TMA molecules.
DOI10.1021/jp035095g
Indexed BySCI
Language英语
WOS IDWOS:000188831700020
PublisherAMER CHEMICAL SOC
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Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/81574
Collection中国科学院化学研究所
Corresponding AuthorWan, LJ
Affiliation1.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
2.Inst Surfaces & Interfaces, Res Ctr, D-52425 Julich, Germany
Recommended Citation
GB/T 7714
Su, GJ,Zhang, HM,Wan, LJ,et al. Potential-induced phase transition of trimesic acid adlayer on Au(111)[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2004,108(6):1931-1937.
APA Su, GJ,Zhang, HM,Wan, LJ,Bai, CL,&Wandlowski, T.(2004).Potential-induced phase transition of trimesic acid adlayer on Au(111).JOURNAL OF PHYSICAL CHEMISTRY B,108(6),1931-1937.
MLA Su, GJ,et al."Potential-induced phase transition of trimesic acid adlayer on Au(111)".JOURNAL OF PHYSICAL CHEMISTRY B 108.6(2004):1931-1937.
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