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  Functional group selective STM Imaging in self-assembled monolayers: Benzeneselenol on Au(111)

Azzam, W., Zharnikov, M., Rohwerder, M., & Bashir, A. (2018). Functional group selective STM Imaging in self-assembled monolayers: Benzeneselenol on Au(111). Applied Surface Science, 427(Part B), 581-586. doi:10.1016/j.apsusc.2017.08.141.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E857-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E85B-4
Genre: Journal Article

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 Creators:
Azzam, Waleed1, 2, Author              
Zharnikov, Michael3, Author              
Rohwerder, Michael4, Author              
Bashir, Asif4, 5, 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              
3Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, Heidelberg, Germany, persistent22              
4Corrosion, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2074315              
5Thyssenkrupp Bilstein GmbH, Niederkell 25, D-54429 Mandern, Germany, persistent22              

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Free keywords: Molecular orientation; Molecules; Monolayers; Organic polymers; Scanning tunneling microscopy, Adlayer structures; Au (111) substrates; Benzeneselenol; High resolution scanning tunneling microscopy; Large unit cell; Molecular length; Molecular tilt; Selective imaging, Self assembled monolayers
 Abstract: Benzeneselenol (PSe) self-assembled monolayers (SAMs) formed on Au(111) substrate by the immersion procedure with an immersion time of 24 h and 4 weeks were studied by high-resolution scanning tunneling microscopy (STM). The short molecular rows, which have been previously attributed to irregular translational domains, were found to be regularly repeated within a single domain in the SAMs fabricated upon the immersion for 4 weeks, forming adlayer structure with a very large unit cell. This structure could be assigned as a (27 × 5) superlattice (α phase) containing 36 molecules in the oblique unit cell. This phase coexisted with a different phase having a commensurate (83×4) superstructure (β phase) containing 28 protrusions per rectangular unit cell. Analysis of the STM images suggested that each PSe molecule in the β phase was imaged not as one but as a pair of protrusions, which were attributed to the benzene ring and the selenium headgroup of the PSe molecule. At the given molecular length, the spacing between the protrusions defined the molecular tilt, allowing us to derive the orientation of the SAM constituents directly from the STM image. © 2017 Elsevier B.V.

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Language(s): eng - English
 Dates: 2018-01-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.apsusc.2017.08.141
BibTex Citekey: Azzam2018581
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Title: Applied Surface Science
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 427 (Part B) Sequence Number: - Start / End Page: 581 - 586 Identifier: ISSN: 0169-4332
CoNE: /journals/resource/954928576736