TY - JOUR
T1 - Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS2
AU - Merida, Cindy S.
AU - Le, Duy
AU - Echeverría, Elena M.
AU - Nguyen, Ariana E.
AU - Rawal, Takat B
AU - Naghibi Alvillar, Sahar
AU - Kandyba, Viktor
AU - Al-Mahboob, Abdullah
AU - Losovyj, Yaroslav B.
AU - Katsiev, Khabiboulakh
AU - Valentin, Michael D.
AU - Huang, Chun-Yu
AU - Gomez, Michael J.
AU - Lu, I-Hsi
AU - Guan, Alison
AU - Barinov, Alexei
AU - Rahman, Talat S
AU - Dowben, Peter A.
AU - Bartels, Ludwig
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: 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.
PY - 2017/12/28
Y1 - 2017/12/28
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/626374
UR - http://pubs.acs.org/doi/10.1021/acs.jpcc.7b07632
UR - http://www.scopus.com/inward/record.url?scp=85040515239&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.7b07632
DO - 10.1021/acs.jpcc.7b07632
M3 - Article
SN - 1932-7447
VL - 122
SP - 267
EP - 273
JO - The Journal of Physical Chemistry C
JF - The Journal of Physical Chemistry C
IS - 1
ER -