Observation of Sulfur on the Surface of Giant Aurothiol Nanoclusters
Authors: C. Gutierrez-Wing1; J.A. Ascencio2; W. De la Cruz3; L. Cota3; M. Jose-Yacamand4
Source: Journal of Nanoscience and Nanotechnology, Volume 2, Number 1, February 2002 , pp. 101-105(5)
Publisher: American Scientific Publishers
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Abstract:
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
1.79 and 1.98.
Keywords: AUROTHIOL NANOCLUSTERS; SULFUR; AUGER ANALYSIS; HREM; EELS; XPS; MICROSCOPY
Document Type: Research article
DOI: 10.1166/jnn.2002.069
Affiliations: 1: ININ, Km 36.5 Carr. Mexico-Toluca; Ocoyoacac, Estado de México 52045, Mexico; Facultad de Quimica, UNAM, México, D.F. 04510, Mexico 2: ININ, Km 36.5 Carr. Mexico-Toluca; Ocoyoacac, Estado de México 52045, Mexico 3: Centro de Ciencias de la Materia Condensada, UNAM 4: Department of Chemical Engineering, Texas Materials Institute and Center for Nano and Molecular Technology, University of Texas, Austin, USA; Instituto de Fisica, UNAM, Apdo. Postal 20-364, 01000 Mexico, D.F. Mexico
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