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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)

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    Type
    Article
    Authors
    Azzam, Waleed
    Al-Rawashdeh, Nathir A F
    Al-Refaie, Najd
    Shekhah, Osama cc
    Bashir, Asif
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Date
    2014-02-25
    Online Publication Date
    2014-02-25
    Print Publication Date
    2014-03-06
    Permanent link to this record
    http://hdl.handle.net/10754/563435
    
    Metadata
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    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.
    Citation
    Azzam, W., Al-Rawashdeh, N. A. F., 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
    Sponsors
    The author W.A. would like to thank TTU for granting him sabbatical leave to Umm Al-Qurrah University, Saudi Arabia. Also, W.A. and N.A.F.A-R. gratefully acknowledge the short-term research fellowship supported by the DFG. W.A. and N.A.F.A-R. gratefully acknowledge TTU (Tafila Technical University) and JUST (Jordan University of Science and Technology) for their partial support during the DFG visit.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/jp500069g
    ae974a485f413a2113503eed53cd6c53
    10.1021/jp500069g
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center

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