J V Lauritsen et al 2003 Nanotechnology 14 385 doi:10.1088/0957-4484/14/3/306
J V Lauritsen1, M Nyberg2, R T Vang1, M V Bollinger2, B S Clausen3, H Topsøe3, K W Jacobsen2, E Lægsgaard1, J K Nørskov2 and F Besenbacher1
Show affiliationsNanostructures often have unusual properties that are linked to their small size. We report here on extraordinary chemical properties associated with the edges of two-dimensional MoS2 nanoclusters, which we show to be able to hydrogenate and break up thiophene (C4H4S) molecules. By combining atomically resolved scanning tunnelling microscopy images of single-layer MoS2 nanoclusters and density functional theory calculations of the reaction energetics, we show that the chemistry of the MoS2 nanoclusters can be associated with one-dimensional metallic states located at the perimeter of the otherwise insulating nanoclusters. The new chemistry identified in this work has significant implications for an important catalytic reaction, since MoS2 nanoclusters constitute the basis of hydrotreating catalysts used to clean up sulfur-containing molecules from oil products in the hydrodesulfurization process.
81.07.-b Nanoscale materials and structures: fabrication and characterization
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
82.20.-w Chemical kinetics and dynamics
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
Surfaces, interfaces and thin films
Issue 3 (March 2003)
Received 23 January 2003
Published 5 February 2003
J V Lauritsen et al 2003 Nanotechnology 14 385
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