In Situ STM Elucidation of the Adsorption and Polymerization of Alkyl Ring-Substituted Aniline on Au(111) Electrode

NCU Institutional Repository > 理學院 > 化學學系 > 期刊論文 > Item 987654321/50730

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/50730

题名:	In Situ STM Elucidation of the Adsorption and Polymerization of Alkyl Ring-Substituted Aniline on Au(111) Electrode
作者:	Chen,SZ;Tu,HL;Wu,CG;Yau,SL;Fan,LJ;Yang,YW
贡献者:	化學學系
关键词:	SCANNING-TUNNELING-MICROSCOPY;SINGLE-CRYSTAL SURFACES;DIRECT VISUALIZATION;CONDUCTING POLYMER;CYCLIC VOLTAMMETRY;CHEMICAL SENSORS;TORSION ANGLE;INDEX FACES;POLYANILINE;ELECTROPOLYMERIZATION
日期:	2010
上传时间:	2012-03-27 18:08:54 (UTC+8)
出版者:	國立中央大學
摘要:	Cyclic voltammetry (CV) and in situ scanning tunneling microscopy (STM) were used to examine the adsorption and electropolymerization of 3-methylaniline (3-MA) and 3-ethylaniline (3-EA) on Au(111) single-crystal electrode in 0.5 M H(2)SO(4) + 6 mM 3-MA and 3-EA, respectively. 3-MA admolecules were adsorbed in a Au(111) (5 x 2 root 3)rect structure (theta = 0.2) at 0.5 V (vs reversible hydrogen electrode, RHE), but rearranged into two less compact adlattices, (5 x 2 root 3)rect, theta = 0.10 and (3 root 3 x 2 root 3), theta = 0.11, when the potential was increased from 0.5 to 0.8 V. In comparison, 3-EA admolecules were adsorbed in Au(111) (4 x 2 root 3)rect, theta = 0.125 at the onset potential (0.9 V) for electropolymerization. Raising the potential in excess of 0.9 V resulted in oxidation and polymerization of 3-MA and 3-EA molecules. The poly(3-MA) molecules produced in the early stage (<1 monolayer) assumed linear conformation, but became predominantly crooked upon the increase of overpotential. In contrast, poly(3-EA) molecules were mostly straight and aligned preferentially in the < 121 > directions of the Au(111) electrode. Linear poly(3-EA) chains continued to thrive with time and stacked up to produce a smooth polymeric film. Possible reasons for this sharp contrast in molecular conformation are discussed.
關聯:	JOURNAL OF PHYSICAL CHEMISTRY C
显示于类别:	[化學學系] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	544	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....