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在含有高浓度的HAuCl4单组份表面活性剂的溶液体系中,研究了由丙酮促进的金纳米棒晶种媒介的光化学生长和溶解。结果表明,在晶种媒介的生长溶液中,当丙酮/生长溶液之比高于0.1/25(V/V)时,高产率的金纳米棒(长径比为3.5,平均直径14 nm)能够快速形成;当丙酮/生长溶液之比等于或低于这一临界值时,在化学陈化阶段已形成的金纳米棒则在紫外光照射下溶解。在溶解过程中,金纳米棒发生一系列的形态变化,包括缩短,形成纳米球和完全溶解。进一步的紫外照射最终使溶液成为无色的初始Au(I)-CTAB络合物溶液状态。
In a solution system containing a high concentration of HAuCl4 one-component surfactant, the photochemical growth and dissolution of the acetone-promoted gold nanorod seed medium was investigated. The results show that high yield gold nanorods (3.5 aspect ratio, 14 nm average diameter) can be obtained at a ratio of acetone / growth solution higher than 0.1 / 25 (V / V) in seed medium growth solutions Rapidly formed; when the acetone / growth solution ratio is equal to or lower than the critical value, gold nanorods formed in the chemical aging stage are dissolved under ultraviolet light irradiation. During the dissolution, gold nanorods undergo a series of morphological changes, including shortening, forming nanospheres and complete dissolution. Further UV irradiation eventually rendered the solution a colorless initial Au (I) -CTAB complex solution state.