Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-04-20

Journal: BEILSTEIN JOURNAL OF NANOTECHNOLOGY

Included Journals: Scopus、PubMed、EI、SCIE

Volume: 8

Issue: 1

Page Number: 892-905

ISSN: 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.