In situ STM imaging of polyethylene glycol adsorbed on an Au(111) electrode in pH 3

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101853

Title:	In situ STM imaging of polyethylene glycol adsorbed on an Au(111) electrode in pH 3
Authors:	姚學麟;Li, Lai-Han;Yau, Shuehlin;Dow, Wei-Ping
Contributors:	理學院化學學系
Keywords:	Adsorption;In situ STM;Polyethylene glycol
Date:	2016-09-01
Issue Date:	2026-04-21 14:48:15 (UTC+8)
Publisher:	Elsevier Inc.;Elsevier B.V
Abstract:	摘要： In situ scanning tunneling microscopy (STM) is used to examine the electrified interface of Au(111) immersed in a pH3 sulfate medium containing polyethylene glycol (PEG) with an average molecular weight of 6000. The cyclic voltammograms thus obtained show two sharp peaks at −0.35 and −0.38V (vs. reversible hydrogen electrode), which correlates with the STM observation of a highly ordered (2×2√3)rect structure and the adsorption of PEGs. X-ray photoelectron spectroscopy is used to examine the film formed at −0.4V, revealing prominent C–C and C–O–C structures, thereby supporting the view of adsorption and reduction PEGs on the Au(111) electrode. STM imaging at the initial stage of PEG's adsorption reveals winding linear segments 0.6nm wide and 20–40nm long, implying helical conformations of PEGs. The PEG film dissolves and yields a high density of nanoclusters, as the potential is switched stepwise from −0.4 to 0.9V. [Display omitted] •Polyethylene glycol (PEG) adsorbed on Au(111) in pH3 sulfate media is imaged by STM.•PEG6000 admolecules appear as winding linear segments spanning ~40nm.•A smooth PEG film completely covers the Au(111) electrode before hydrogen evolves.•PEG film dissolves and leaves a high density of clusters on Au(111) at positive potential. 出版者： Elsevier B.V 出版日期： 2016-09 出處： Electrochemistry communications, 2016-09, Vol.70, p.1-4 資源來源： Elsevier ScienceDirect Journals Complete - Autoholdings 版權： 2016 Elsevier B.V. 識別號： ISSN: 1388-2481 識別號： ISSN: 1873-1902 識別號： EISSN: 1873-1902 識別號： DOI: 10.1016/j.elecom.2016.06.007
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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