Dependence of the gold nanorod aspect ratio on the nature of the directing surfactant in aqueous solution
Dependence of the gold nanorod aspect ratio on the nature of the directing surfactant in aqueous solution
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DOI：
10.1021/la034919i
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发表时间：
2003-10-14
期刊：
影响因子：
3.9
通讯作者：
Murphy, CJ
中科院分区：
文献类型：
--
作者：
Gao, JX;Bender, CM;Murphy, CJ
采用三步种子介导生长法制备金纳米粒子。选择不同的表面活性剂，烷基三甲基溴化铵（C（n）TAB，n = 10，12，14，16和18）和十六烷基氯化吡啶（C16 PC）作为稳定剂。一般来说，发现随着表面活性剂链的长度增加，所得金纳米粒子的纵横比增加：纵横比为1（对于C（10）TAB）、5 +/-2（C（12）TAB）、17 +/-3（C（14）TAB）和23 +/-4（C（16）TAB）。金纳米颗粒的等离子体吸收最大值随形状的变化而变化，从520 nm（球体）到超过2000 nm（高纵横比纳米棒）。我们建议，表面活性剂结合作为一个双层的增长纳米粒子，并通过“拉链”机制，协助纳米粒子伸长。
A three-step seed-mediated growth method was used to make gold nanoparticles. Different surfactants, alkyltrimethylammonium bromides (C(n)TAB, n = 10, 12, 14, 16, and 18) and cetylpyridinium chloride (C16PC), were chosen as stabilizers. In general, it was found that as the length of the surfactant chain increased, the resulting gold nanoparticles' aspect ratio increased: the aspect ratio was 1 (for C(10)TAB), 5 +/- 2 (C(12)TAB), 17 +/- 3 (C(14)TAB), and 23 +/- 4 (C(16)TAB). The plasmon absorption maxima for the gold nanoparticles varied as a function of the shape, from 520 mn (spheres) to beyond 2000 mn (high aspect ratio nanorods). We propose that the surfactant binds as a bilayer to the growing nanoparticle and assists in nanoparticle elongation via a "zipping" mechanism.