Preparation of gold nanopowders and nanoparticles using chitosan suspensions |
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Authors: | Chao-Ming Shih Yeong-Tarng Shieh Yawo-Kuo Twu |
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Institution: | 1. Department of Bioindustry Technology, Dayeh University, Dacun, Changhua 51591, Taiwan, ROC;2. Department of Chemical and Materials Engineering, National University of Kaohsiung, Kaohsiung 81148, Taiwan, ROC |
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Abstract: | Simple methods for preparation of gold nanopowders and nanoparticles are reported. Gold/chitosan nanoparticles were prepared by using basic chitosan suspension as a dispersant and as a reductant. The resulting nanoparticles were processed by pyrolysis and thus obtain black gold nanopowder. The FESEM images indicate that most diameters of the nanopowder prepared were in the range of 50 and 200 nm. Hydrolysis is another quick decomposition method for chitosan. Acetic acid was adopted to implement the hydrolysis. The AEM images of the auberginic suspension show that the average gold nanoparticle diameter was less than 40 nm with good dispersion. Use of chitosan suspensions can produce gold nanopowder as well as gold nanoparticle without using toxic organic chemicals. |
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