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Gold Nanoparticles in Ionic Liquids

Ionic liquids exert extremely low vapor pressure, and it is difficult to distill them. Using this property, Au nanoparticles are synthesized by argon sputter deposition onto ionic liquids. This method is reported by Prof. Torimoto (Nagoya Univ.) and Prof. Kuwabata (Osaka Univ.). We can synthesize metal and alloy nanoparticle directly from bulk material by this method.

We have studied about the effects of ionic liquids on the formation of nanoparticles for this method. From previous researches, the effects of alkyl chain length of cation and temperature of ionic liquid have been revealed. Now, we study about further detail of gold nanoparticles by small-angle X-ray scattering, X-ray absorption spectroscopy, and transmission electron microscope.

Y. Hatakeyama, M. Okamoto, T. Torimoto, S. Kuwabata, K. Nishikawa J. Phys. Chem. C, 113, 3917-3922 (2009).
Y. Hatakeyama, S. Takahashi, K. Nishikawa J. Phys. Chem. C, 114, 11098-11102 (2010).
Y. Hatakeyama, K. Onishi, K. Nishikawa RSC Adv., 1, 1815-1821 (2011).

Fig.1 Outline drawing and photograph of sputtering deposition onto ionic liquids.

Fig.2 SAXS patterns and particle size distribution curves.

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