Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9675871 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2005 | 7 Pages |
Abstract
Ag(Au) bimetallic core-shell nanoparticles were prepared by a new seed growth method. Ascorbic acid was used to reduce the complex of HAuCl4 and hexadecyltrimethylammoniumbromide (CTAB). This resulted in the forming of colorless Au(I) (AuCl2â). It was used as the growth solution to prepare these bimetallic core-shell nanoparticles. These nanoparticles were characterized by UV-vis spectroscopy, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results showed these nanoparticles exhibited core-shell shape and there was large amount of Ag in the shell. These nanoparticles could be produced in a few minutes without violent stirring and the method was easy and convenient compared with others. The effect of amount of AuCl2â on the shape of nanoparticles was also studied. Many small gold nanoparticles were formed on the surface of bimetallic core-shell nanoparticles in the presence of excess AuCl2â. The mechanisms were also proposed to explain the process of colloidal preparation.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
Lei Qian, Xiurong Yang,