Deposition of gold nanoparticles on silica spheres by electroless metal plating technique

作者：Kobayashi Y; Tadaki Y; Nagao D; Konno M^*

来源：Journal of Colloid and Interface Science, 2005, 283(2): 601-604.

DOI：10.1016/j.jcis.2004.09.002

• nanoparticles
• gold
• electroless metal plating
• surface plasmon resonance
• silica
• deposition

A previously proposed method for metal deposition with silver [Kobayashi et al., Chem. Mater. 13 (2001) 1630] was extended to uniform deposition of gold nanoparticles on submicrometer-sized silica spheres. The present method consisted of three steps: (1) the adsorption of Sn2+ ions took place on surface of silica particles, (2) Ag+ ions added were reduced and simultaneously adsorbed to the surface, while Sn2+ was oxidized to Sn4+, and (3) Au+ ions added were reduced and deposited on the Ag surface. TEM observation, X-ray diffractometry, and UV-vis absorption spectroscopy revealed that gold metal nanoparticles with an average particle size of 13 nut and a crystal size of 5.1 nm were formed on the silica spheres with a size of 273 nm at an Au concentration of 0.77 M.

• 出版日期2005-3-15