TY - JOUR
T1 - Combined spectroscopy and microscopy of supported MoS2 nanoparticles
AU - Nielsen, Jane Hvolbæk
AU - Bech, Lone
AU - Nielsen, Kenneth
AU - Tison, Yann
AU - Jørgensen, Kristina Pilt
AU - Bonde, Jacob Lindner
AU - Horch, Sebastian
AU - Jaramillo, Thomas
AU - Chorkendorff, Ib
PY - 2009
Y1 - 2009
N2 - Supported molybdenum-sulfide nanoparticles are known catalysts for petroleum hydrodesulfurization as well as for electrochemical hydrogen evolution. In this study, we investigate molybdenum-sulfide nanoparticles supported on Au(111) using X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM), aiming to correlate spectroscopically determined chemical states with atomically resolved nanostructure. The results of this study allow us to conclude the following: (1) the XPS results from our model system are in good agreement with previously published results on supported MoS2 for industrial applications, validating in part the fidelity of the model system; (2) STM reveals that catalytically active, crystalline MoS2 nanoparticles exhibiting the well-known metallic edge state are only present after a post-deposition annealing step in the synthesis procedure, without which the particles exhibit amorphous shapes and incomplete sulfidation; and (3) the sulfided nanoparticles are found to be stable in air at room temperature.
AB - Supported molybdenum-sulfide nanoparticles are known catalysts for petroleum hydrodesulfurization as well as for electrochemical hydrogen evolution. In this study, we investigate molybdenum-sulfide nanoparticles supported on Au(111) using X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM), aiming to correlate spectroscopically determined chemical states with atomically resolved nanostructure. The results of this study allow us to conclude the following: (1) the XPS results from our model system are in good agreement with previously published results on supported MoS2 for industrial applications, validating in part the fidelity of the model system; (2) STM reveals that catalytically active, crystalline MoS2 nanoparticles exhibiting the well-known metallic edge state are only present after a post-deposition annealing step in the synthesis procedure, without which the particles exhibit amorphous shapes and incomplete sulfidation; and (3) the sulfided nanoparticles are found to be stable in air at room temperature.
KW - Supported nanoparticle
KW - X-ray photoelectron spectroscopy
KW - Au(111)
KW - Scanning tunneling microscopy
KW - Molybdenum-sulfide
U2 - 10.1016/j.susc.2009.02.039
DO - 10.1016/j.susc.2009.02.039
M3 - Journal article
SN - 0039-6028
VL - 603
SP - 1182
EP - 1189
JO - Surface Science
JF - Surface Science
IS - 9
ER -