Preparation of monodispersed Cu nanoparticles by microwave-assisted alcohol reduction

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作者：
Nakamura, Takashi [1 ]
Tsukahara, Yasunori [3 ]
Sakata, Takao [4 ]
Mori, Hirotaro [4 ]
Kanbe, Yumi [5 ]
Bessho, Hisami [5 ]
Wada, Yuji [2 ,3 ]
机构：
[1] Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871
[2] Department of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Okayama 700-8530
[3] Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871
[4] Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7-1 Mihogaoka, Ibaraki, Osaka 567-0047
[5] Tokai Rubber Industries Ltd., 3-1 Higashi, Komaki 485-8550
来源：
Bulletin of the Chemical Society of Japan | 2007年 / 80卷 / 01期
关键词：
Copper (Cu) nanoparticles were prepared via a microwave-assisted alcohol reduction process. We have succeeded in selectively preparing monodispersed Cu nanoparticles with or without surface plasmon absorption. Monodispersed Cu nanoparticles with average sizes of 5-6 nm (with the surface plasmon absorption) and 2-3 nm (without the surface plasmon absorption) were prepared using copper(II) octanoate and copper(II) myristate; respectively; as the copper precursors by reduction with alcohols under microwave-heating at 443K for 20 min. Noteworthy; Cu2O and CuO were not observed in the electron diffraction patterns of the prepared Cu nanoparticles; demonstrating chemical stability of the nanoparticles against oxidation in air. When using a long-chain carboxylate as an organic moiety bearing a short alkyl chain (copper(II) octanoate); the rate of the reduction was faster than long one (copper(II) myristate). The activation energies for the reduction of Cu2+ using copper(II) octanoate and copper(II) myristate were estimated to be 115 and 124 kJ mol-1; respectively. We have shown that the length of the alkyl chain contained in the copper precursors; heating temperature; and microwave-irradiation time are important for rapidly preparing monodispersed Cu nanoparticles. © 2007 The Chemical Society of Japan;
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页码：224 / 232
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