Characterization of molybdenum carbide nanoparticles formed on Au(111) using reactive-Layer assisted deposition
Journal of Physical Chemistry B, ISSN: 1520-6106, Vol: 109, Issue: 1, Page: 44-47
2005
- 33Citations
- 29Captures
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Article Description
Temperature programmed desorption (TPD), Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM) have been used to characterize molybdenum carbide nanoparticles prepared on a Au(111) substrate. The MoC , nanoparticles were formed by Mo metal deposition onto a reactive multilayer of ethylene, which was physisorbed on a Au(111) substrate at low temperatures (< 100 K). The resulting clusters have an average diameter of ∼1.5 nm and aggregate in the fcc troughs located on either side of the elbows of the reconstructed Au(111) surface. Core level XPS shows that the electronic environment of the Mo and C atoms in the nanoparticles is similar to that found in Mo C-(0001) single crystals and carburized Mo metal surfaces. Peak intensities in XPS and AES spectra were used to estimate an average Mo/C atomic ratio of 1.2 ± 0.3 for nanoparticles annealed above 600 K.
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