Observation of sulfur on the surface of giant aurothiol nanoclusters.
We report the study of aurothiol nanoclusters using high-resolution electron microscopy, energy loss spectroscopy, X-ray photoelectron spectroscopy, Auger spectroscopy, and microscopy. It is concluded that the sulfur atoms are located on the surface of the gold nanoparticles in both (100) and (111) microfacets. The X-ray photoelectron spectroscopy data show that there is a Au-Au bond as well as a Au-S bond. Auger depth profile measurements made by sputtering of the nanoparticles corroborates that the sulfur is located on the surface of the nanoparticle. Quantitative Auger analysis indicates a ratio Au/S between approximately 1.79 and 1.98.
Gutierrez-Wing
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ININ, Km 36.5 Carr. Mexico-Toluca, Ocoyoacac, Estado de México 52045, Mexico.
Ascencio
J A
JA
De la Cruz
W
W
Cota
L
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Jose-Yacaman
M
M
D001665:Binding Sites; D003461:Crystallography / Q000379:methods; D046911:Macromolecular Substances; D008422:Materials Testing / Q000379:methods; D008854:Microscopy, Electron; D008958:Models, Molecular; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013052:Spectrometry, X-Ray Emission; D013438:Sulfhydryl Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*; D013499:Surface Properties
D046911:Macromolecular Substances; D013438:Sulfhydryl Compounds; C013976:dodecylmercaptan; D013455:Sulfur