Comparative studies between synthetic routes of SiO2@Au composite nanoparticles

Autor:	Yong-Gang Feng, Dong-Jin Qian, Lu Zhang, Meng Chen, Junyan Zhang, Li-Ying Wang
Rok vydání:	2007
Předmět:	Materials science Mechanical Engineering Nanoparticle Nanotechnology respiratory system Condensed Matter Physics Microsphere chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials Sodium citrate General Materials Science Composite nanoparticles Deposition (law)
Zdroj:	Materials Research Bulletin. 42:1457-1467
ISSN:	0025-5408
Popis:	We studied two different methods for the deposition of Au nanoparticles (Au NPs) onto the functionalized silica microspheres. One method was to mix the two kinds of particles together and react at room temperature overnight. The other one was to reduce hydrochloroauric acid to Au NPs with sodium citrate in the presence of the functionalized silica microspheres (one for the naked silica microspheres, the other for the Au-attached silica microspheres). We investigated the morphologies of SiO2@Au composite nanoparticles synthesized by these two methods, and found that the latter achieved a denser Au coverage on silica microspheres. Furthermore, we studied the effect of the pH values in a wide range, respectively, for the two methods. A possible mechanism was put forward to interpret the formation of SiO2@Au composite nanoparticles and the effects of the synthetic routes and pH values on the morphologies and optical properties.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cde5b0022ce089919aa26c665e7e0dc2 https://doi.org/10.1016/j.materresbull.2006.11.019 Zobrazit plný text záznamu Full Text from ScienceDirect