Reference

Electrochemical investigation of dynamic interfacial processes at 1-octadecanethiol-modified copper electrodes in halide-containing solutions

Electrochemical investigation of dynamic interfacial processes at 1-octadecanethiol-modified copper electrodes in halide-containing solutions. Ma, H. Y.; Yang, C.; Chen, S. H.; Jiao, Y. L.; Huang, S. X.; Li, D. G.; Luo, J. L. (Department of Chemistry, Shandong University, Jinan 250100, Peop. Rep. China). Electrochimica Acta, 48(28), 4277-4289 (English) 2003 Elsevier Science B.V. CODEN: ELCAAV. ISSN: 0013-4686. DOCUMENT TYPE: Journal CA Section: 72 (Electrochemistry) Section cross-reference(s): 56, 73, 76 1-Octadecanethiol (C18SH) monolayers were self-assembled on the fresh and active Cu surface pretreated by HNO3 etching method. The surface properties of the alkanethiol-modified Cu electrode in halide-contg. solns. were characterized systematically by using several electrochem. methods, including polarization curves, cyclic voltammetry, electrochem. impedance spectroscopy (EIS) and electrochem. noise (EN). C18SH self-assembled monolayers (SAMs) onto Cu provide a flexible method that can protect the underlying Cu against corrosion. With the immersion time of SAMs-coated Cu electrode in NaCl and HCl corrosive solns. increasing, a slow loss of corrosion protection ability of SAMs indicates dynamic processes occurring at the electrode/soln. interface and in the monolayers, such as expansion of the defects and transport of corrosive ions through defects of SAMs.In this experiment, several chemicals are used like 7647-01-0 and 7647-14-5 Electrochem. noise (EN) is employed to detect the alkanethiol-modified Cu surfaces immersed in HCl soln. This observation suggests the pitting process assoc. with dynamic processes in the 1-octadecanethiol layer. .

Effect of Chemically Modified Tips on STM Imaging of 1-Octadecanethiol Molecule

Effect of Chemically Modified Tips on STM Imaging of 1-Octadecanethiol Molecule. Xu, Qing-Min; Wan, Li-Jun; Yin, Shu-Xia; Wang, Chen; Bai, Chun-Li ( Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, Peop. Rep. China). Journal of Physical Chemistry B, 105(43), 10465-10467 (English) 2001 American Chemical Society. CODEN: JPCBFK. ISSN: 1089-5647. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) The effect of chem. modified tips on STM imaging was studied. An electrochem. technique was used to prep. a monolayer of sulfur and iodine on the apex of STM tips. The chem. modified STM tips were 1st employed to image a 1-octadecanethiol (1-C18H37SH) adlayer on a highly oriented pyrolytic graphite (HOPG) surface. The images acquired with S-modified tips could ascertain the structural detail of thiol groups of the adsorbed mols., while that acquired with I-modified tips appeared in a low resoln. The contrast variations of STM images are attributed to the changes of electronic states of the tips.