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    Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS2

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    Type
    Article
    Authors
    Merida, Cindy S.
    Le, Duy
    Echeverría, Elena M.
    Nguyen, Ariana E.
    Rawal, Takat B
    Naghibi Alvillar, Sahar
    Kandyba, Viktor
    Al-Mahboob, Abdullah
    Losovyj, Yaroslav B.
    Katsiev, Khabiboulakh
    Valentin, Michael D.
    Huang, Chun-Yu
    Gomez, Michael J.
    Lu, I-Hsi
    Guan, Alison
    Barinov, Alexei
    Rahman, Talat S
    Dowben, Peter A.
    Bartels, Ludwig
    KAUST Department
    KAUST Solar Center (KSC)
    Physical Sciences and Engineering (PSE) Division
    Date
    2017-12-28
    Online Publication Date
    2017-12-28
    Print Publication Date
    2018-01-11
    Permanent link to this record
    http://hdl.handle.net/10754/626374
    
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    Abstract
    Gold islands are typically associated with high binding affinity to adsorbates and catalytic activity. Here we present the growth of such dispersed nanoscale gold islands on single layer MoS2, prepared on an inert SiO2/Si support by chemical vapor deposition (CVD). This study offers a combination of growth process development, optical characterization, photoelectron spectroscopy at sub-micron spatial resolution, and advanced density functional theory modeling for detailed insight into the electronic interaction between gold and single-layer MoS2. In particular, we find the gold density of states in Au/MoS2/SiO2/Si to be far less well-defined than Au islands on other 2-dimensional materials such as graphene, for which we also provide data. We attribute this effect to the presence of heterogeneous Au adatom/MoS2-support interactions within the nanometer-scale gold cluster. As a consequence, theory predicts that CO will exhibit adsorption energies in excess of 1 eV at the Au cluster edges, where the local density of states is dominated by Au 5dz2 symmetry.
    Citation
    Merida CS, Le D, Echeverría EM, Nguyen AE, Rawal TB, et al. (2017) Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS2. The Journal of Physical Chemistry C. Available: http://dx.doi.org/10.1021/acs.jpcc.7b07632.
    Sponsors
    We gratefully acknowledge joint funding from DOE grant DE-FG02-07ER15842 (UCF, UCR, UNL). DFT calculations were performed using resource from the National Energy Research Scientific Computing Center (NERSC, project 1996) and the Advanced Research Computing Center at UCF. Synchrotron resources were provided by Elettra. A.E.N as well as C.S.N, S.N.A. and A.G. gratefully acknowledges fellowship support through the National Science Foundation of the United States of America via grants DGE 1326120 and DMR 1359136, respectively.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.7b07632
    Additional Links
    http://pubs.acs.org/doi/10.1021/acs.jpcc.7b07632
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpcc.7b07632
    Scopus Count
    Collections
    Articles; Physical Sciences and Engineering (PSE) Division; KAUST Solar Center (KSC)

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