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Letter

Synthesis of Silica−Gold Nanocomposites and Their Porous Nanoparticles by an In-Situ Approach

Supporting Info

Ashavani Kumar,^†* Victor L. Pushparaj,^†* Saravanababu Murugesan,^‡ Gunaranjan Viswanathan,^† Rohit Nalamasu,^†^§ Robert J. Linhardt,^‡ Omkaram Nalamasu,^† and Pulickel M. Ajayan^†

Department of Materials Science and Engineering and Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 and Niskayuna High School, Ball Town Road, Niskayuna, New York 12309

Langmuir, 2006, 22 (21), pp 8631–8634

DOI: 10.1021/la060869g

Publication Date (Web): September 7, 2006

†

Department of Materials Science and Engineering, Rensselaer Polytechnic Institute.

Corresponding authors. E-mail: kumara4@rpi.edu (A. Kumar), pushpv@rpi.edu (P. Victor). Tel: 001-518-2768703. Fax: 001-518-2768554.

‡

Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute.

Niskayuna High School.

Abstract

We demonstrate the one-step synthesis of a silica−gold nanocomposite by simultaneous hydrolysis and reduction of gold chloride. The aminophenyl group was used as a reducing agent, and the trimethoxy silane group acts a precursor for the formation of silica. The porous gold nanoparticles were formed by etching out the silica−gold nanocomposite by hydrofluoric acid. The electron diffraction of porous gold nanoparticles showed that the particle are polycrystalline with FCC structure. The silica−gold nanocomposite exhibited nonlinear current−voltage behavior, and the porous gold nanoparticles displayed linear current−voltage behavior.

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