Proceedings of the Korean Institute of Surface Engineering Conference (한국표면공학회:학술대회논문집)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effects of pH on Preparation of Au-Coated $TiO_2$ Nanoparticles by Deposition-Precipitation Method

  • Nguyen, Dung The (Department of Chemical Engineering, Kangwon National University) ;
  • Kim, Dong-Joo (Department of Chemical Engineering, Kangwon National University) ;
  • Kim, Kyo-Seon (Department of Chemical Engineering, Kangwon National University)
  • Published : 2009.05.27
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Abstract

We prepared the Au-coated $TiO_2$ (Au/$TiO_2$) nanoparticles by deposition-precipitation (DP) method with and without bases (urea or NaOH) and investigated the effects of pH on the preparation of Au/$TiO_2$ nanoparticles for various kinds of bases. For the DP method without bases, the Au nanoparticles in the diameter of about 50 nm were generated in the solution by the reduction reaction with trisodium citrate and they did not deposit on the surface of $TiO_2$. For the DP method with bases, Au precursors deposited on the surface of $TiO_2$ and then reduced to the Au nanoparticles in the diameter of 4-5 nm on the surface of $TiO_2$ by the reaction with trisodium citrate.

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