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  On the influence of the aliphatic linker on fabrication of highly ordered and orientated self-assembled monolayers of aromatic selenols on AU(111)

Azzam, W., Al-Rawashdeh, N. A., Al-Refaie, N., Shekhah, O., & Bashir, A. (2014). On the influence of the aliphatic linker on fabrication of highly ordered and orientated self-assembled monolayers of aromatic selenols on AU(111). The Journal of Physical Chemistry C, 118(9), 4846-4859. doi:10.1021/jp500069g.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-C0AD-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-C0AE-2
Genre: Journal Article

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 Creators:
Azzam, Waleed1, 2, Author              
Al-Rawashdeh, Nathir A.F.3, 4, Author              
Al-Refaie, Najd5, Author              
Shekhah, Osama6, Author              
Bashir, Asif7, Author              
Affiliations:
1Department of Chemistry, Tafila Technical University, P.O. Box 179, 66110 Tafila, Jordan, ou_persistent22              
2Department of Chemistry, University College in Al-Qunfudah, Umm Al-Qura University, 1109 Makkah Al-Mukarramah, Saudi Arabia, ou_persistent22              
3Department of Applied Chemical Sciences, Jordan University of Science and Technology, P.O. Box 3030, Irbid-22110, Jordan, persistent22              
4Department of Chemistry, College of Science, United Arab Emirates University, P.O. Box 15551, Al Ain, Abu Dhabi, United Arab Emirates, persistent22              
5Department of Chemistry, University College in Al-Qunfudah, Umm Al-Qura University, Makkah Al-Mukarramah, Saudi Arabia, persistent22              
6Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia, persistent22              
7Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              

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Free keywords: Adlayer structures; Adsorption geometries; Au (111) substrates; Molecular packing structure; Near edge x-ray absorption fine structure spectroscopies; Spectroscopic data; Structural transformation; Upright orientations, Adsorption; Low energy electron diffraction; Photoelectrons; Scanning tunneling microscopy; Self assembled monolayers; X ray absorption fine structure spectroscopy; X ray photoelectron spectroscopy, Molecular orientation
 Abstract: Self-assembled monolayers (SAMs) formed by adsorption of 1,2-dibenzyldiselenide (DPMSe) and 1,2-diphenyldiselenide (DBSe) on Au(111) substrates at room temperature have been characterized using scanning tunnelling microscopy, X-ray photoelectron spectroscopy, infrared reflection absorption spectroscopy, near-edge X-ray absorption fine structure spectroscopy, and low-energy electron diffraction. Upon adsorption, the Se-Se bonds in DPMSe and DBSe were cleaved on the gold surface to form phenylmethaneselenolate (PMSe) and benzeneselenolate (BSe) species, respectively. Although both PMSe and BSe molecular entities only differ in their structure (an additional methyl group in PMSe), the resulting monolayer films revealed noteworthy dissimilarities regarding their adlayer SAM structure and surface morphology. The molecular adlayer structure and orientation of PMSe and BSe species were found to vary significantly with the immersion time (IT). The resulting PMSe films were poorly organized, and the structure was described by a (4√3 × 2) rectangular unit cell for the SAMs prepared with 24 h of IT. Moreover, the PMSe-SAMs were found to be unstable upon exposure to air for a long time. Our results showed that exposure to air for 48 h results in the formation of small bright ad-islands, which have a height corresponding to that of a single atomic step on the Au(111). Contrary, BSe-SAMs exhibited densely packed and well-ordered monolayers, and two different structural phases were resolved at short and long ITs. The most densely packed structure was obtained for SAMs prepared with very short ITs (10 min). Upon increasing the IT, the SAMs exhibited structural changes to a lower density of molecular packing structure. The spectroscopic data also confirmed this structural transformation by suggesting an upright orientation for BSe-SAMs prepared after short ITs and strongly inclined adsorption geometry for SAMs prepared after long ITs. © 2014 American Chemical Society.

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Language(s): eng - English
 Dates: 2014-03-06
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp500069g
BibTex Citekey: Azzam20144846
 Degree: -

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Title: The Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 118 (9) Sequence Number: - Start / End Page: 4846 - 4859 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766