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Indexed by:期刊论文

Date of Publication:2017-04-20

Journal:BEILSTEIN JOURNAL OF NANOTECHNOLOGY

Included Journals:SCIE、EI、PubMed、Scopus

Volume:8

Issue:1

Page Number:892-905

ISSN No.:2190-4286

Key Words:organic thin films; selenolates; self-assembled monolayers; thiolates; triptycene

Abstract:To study the implications of highly space-demanding organic moieties on the properties of self-assembled monolayers (SAMs), triptycyl thiolates and selenolates with and without methylene spacers on Au(111) surfaces were comprehensively studied using ultra-high vacuum infrared reflection absorption spectroscopy, X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy and thermal desorption spectroscopy. Due to packing effects, the molecules in all monolayers are substantially tilted. In the presence of a methylene spacer the tilt is slightly less pronounced. The selenolate monolayers exhibit smaller defect densities and therefore are more densely packed than their thiolate analogues. The Se-Au binding energy in the investigated SAMs was found to be higher than the S-Au binding energy.