Syntheses of micrometer-long Pt and Ag nanowires through SBA-15 templating
- 385 Downloads
We synthesized Pt and Ag nanowires using a mesoporous silica, SBA-15, as templates. The obtained nanowires are a few micrometers (~4 μm) long and 7 nm in diameter. The nanowires are free from bundling and, thus, can be separated as single nanowires. The successful synthesis of such nanowires requires a few considerations. In general, SBA-15 has microchannels on the walls through which the mesopores are interconnected when synthesized at 100 °C or higher. We, therefore, synthesized SBA-15 at a low temperature (80 °C) to eliminate the microchannels. Impregnation of the metal precursors and reduction of them into metals forms metal particles outside the pores in addition to the desired metal nanowires inside the pores. Surface alkylation of SBA-15 prohibits the nucleation of metal on the external surface and exclusively forms the nanowires. Finally, the introduction of surface passivating agent, an alkylthiol, during the removal of the template keeps the nanowires from interacting with one another. The Pt and Ag nanowires so-synthesized were characterized by electron microscopy.
KeywordsNanowire Synthesis Template Mesoporous silica
This study was supported by Grants NRF-2011-0031392 (Priority Research Center Program), NRF-2011-0006268 (Basic Science Research Program), and NRF-20090081018 (Basic Science Research Program). We thank KBSI and CCRF for the TEM data.
- Huang MH, Choudrey A, Yang P (2000) Ag nanowire formation within mesoporous silica. Chem Commun 1063–1064Google Scholar
- Kim DJ, Dunn BC, Cole P, Turpin G, Ernst RD, Pugmire RJ, Kang M, Kim JM, Eyring EM (2005) Enhancement in the reducibility of cobalt oxides on a mesoporous silica supported cobalt catalyst. Chem Commun 1462–1464Google Scholar
- Shon JK, Kong SS, Kim JM, Ko CH, Jin M, Lee YY, Hwang SH, Yoon JA, Kim JN (2009a) Facile synthesis of highly ordered mesoporous silver using cubic mesoporous silica template with controlled surface hydrophobicity. Chem Commun 650–652Google Scholar
- Worboys LM, Edwards PP, Anderson PA (2002) Silver nanowires: inclusion in and extrusion from a mesoporous template. Chem Commun 2894–2895Google Scholar