Synthesis of Nanorattles Composed of Gold Nanoparticles Encapsul

Synthesis of Nanorattles Composed of
Gold Nanoparticles Encapsulated in
Mesoporous Carbon and Polymer Shells

Minsuk Kim, Kwonnam Sohn, Hyon Bin Na, and Taeghwan Hyeon*
National CreatiVe Research InitiatiVe Center for Oxide Nanocrystalline Materials and
School of Chemical Engineering, Seoul National UniVersity, Seoul 151-744, Korea
Received September 27, 2002; Revised Manuscript Received October 7, 2002

ABSTRACT

In this study, we fabricated new spherical silica templates with submicrometer sized solid cores containing an encapsulated Au nanoparticle
surrounded by a mesoporous shell structure. Hollow spherical carbon and polymer capsules, containing gold nanoparticles, were synthesized
using these silica templates. The resulting carbon capsules inversely replicated the structure of the silica template and contained uniform
pores with a narrow pore size distribution centered at 3.8 nm. These carbon capsules exhibited a BET surface area of >1000 m2 g-1 and a total
pore volume of >1.0 cm3 g-1. In addition, hollow polymer capsules having a well-defined pore size were fabricated using a similar synthetic
procedure.

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