期刊
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
卷 7, 期 9, 页码 3146-3151出版社
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2007.682
关键词
gold nanoparticles; photoincluced method; synthesis Le Chatelier theory; characterization trisodium citrate
We prepared gold nanoparticles (Au NPs) by only using trisodium citrate as the stabilizer. The detailed reaction mechanisms of S(N)1 and E1 reactions are examined and evidenced in this study by FTIR data. Citric acid is a kind of tertiary substrate, In aqueous solution, the substitution nucleophile path 1 (S(N)1) reaction and Elimination path 1 (E1) reaction usually occur simultaneously. Chloride ions, the substitution nucleophile, play a very important role to launch the mechanisms of S(N)1 and E1 reactions. Controlling the concentration of the chloride ions with the addition of HCI(aq) according to Le Chatelier theory, the average particle size of Au NPs (5.5 nm) was achieved to overcome the minimum limited size (similar to 10 nm). Two stages of the photoinduced method, aggregation into triangular conglomerates and growth into triangular particles, were determined form TEM observations. This preparation of Au NPs has potential in tuning the size, shape, and mechanism of Au NP formation by using only environmentally friendly trisodium citrate and the photoinduced method.
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