Untitled

Startsev, Yu. K.

doi:10.1023/a:1017576603001

Cited by 3 publications

(2 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Despite the inert basal plane, MoS 2 has been of interest due to its catalytic activity for hydrodesulfurization ͑HDS͒ where organic sulfur is removed from petroleum and coal feedstocks by reaction with hydrogen gas to form H 2 S. 3,4 The catalytic activity of MoS 2 for HDS has been associated with edge sites, which are more numerous on the small particles employed in supported HDS catalysts. 1,2 Sulfur atoms on the basal planes of MoS 2 have a complete coordination below the plane, making them relatively unreactive.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling microscopy investigation of nanostructures produced by Ar+ and He+ bombardment of MoS2 surfaces

Park¹,

France²,

Parkinson³

2005

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

View full text Add to dashboard Cite

Nanostructures were fabricated on natural MoS 2 crystals by bombardment with low doses of Ar + and He + with energies ranging from 100 to 5 keV. The bombarded surfaces were investigated with x-ray photoemission spectroscopy ͑XPS͒ and scanning tunneling microscopy ͑STM͒ in an ultrahigh vacuum environment. The ion exposures were low enough to ensure that the observed nanostructures can be associated with individual ion impacts. Argon ions ͑Ar + ͒ with energies of 100 eV or less remove very few, if any, sulfur atoms from the surface but STM and XPS studies reveal that the electronic structure of the MoS 2 surface is altered. Ar + with energies greater than 100 eV has a higher probability of sputtering sulfur atoms from the surface. The apparent size of the nanostructures in the STM images increased with Ar + energies up to about 1 keV and was dependent on the angle of incidence of the Ar + . Helium ion ͑He + ͒ sputtering of MoS 2 produced similar but smaller nanostructures when compared to Ar + at the same impinged ion energy. STM images showed bright ring-shaped features were created with He + energies greater than 500 eV. On the basis of XPS and current imaging tunneling spectroscopy investigations, the features are assigned to sulfur atom vacancies. A change in the surface doping type from n to p was observed upon light sputtering of the surface.

show abstract

Section: Introductionmentioning

confidence: 99%

Scanning tunneling microscopy investigation of nanostructures produced by Ar+ and He+ bombardment of MoS2 surfaces

Park¹,

France²,

Parkinson³

2005

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

View full text Add to dashboard Cite

show abstract

“…Ion exchange is, for instance, used for the chemical strengthening of glasses [20,21] and for producing optical waveguides [22][23][24]. On the other hand, the study of ion-exchanged glasses should also be instructive in order to obtain a better understanding of the mixed alkali effect.…”

Section: Introductionmentioning

confidence: 99%