Large-Scale Synthesis of Gold Nanorods through Continuous Secondary Growth.

Large-Scale Synthesis of Gold Nanorods through Continuous Secondary Growth.
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DOI:
10.1021/cm402277y
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发表时间:
2013-11-26
影响因子:
8.6
通讯作者:
Tracy, Joseph B.
Tracy, Joseph B.
中科院分区:
材料科学2区
文献类型:
--
作者:
Kozek, Krystian A.;Kozek, Klaudia M.;Wu, Wei-Chen;Mishra, Sumeet R.;Tracy, Joseph B.

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金纳米棒(GNR)表现出可调的纵向表面等离子体共振(LSPR),这取决于GNR的纵横比(AR)。独立地控制GNR的AR和尺寸仍然具有挑战性,但这是重要的,因为散射强度强烈地取决于GNR尺寸。在这里,我们报告的二次(播种)生长过程中,其中连续添加抗坏血酸(AA)的GNRs,稳定的十六烷基三甲基溴化铵(CTAB)和合成的一个共同的GNR生长过程中,沉积剩余的(~70%)的Au前体上的GNRs的搅拌溶液。GNR合成的生长阶段通常在没有搅拌的情况下进行,因为据信搅拌会降低棒状纳米颗粒的产率,但我们报告称,在二次生长期间,搅拌与连续添加AA相结合,可以改善对GNR的AR和尺寸的控制。在普通的初级GNR生长程序之后,GNR的LSPR为~820 nm,其可以在次级生长期间通过调节AA添加速率或添加苄基二甲基十六烷基氯化铵水合物(BDAC)在~700-880 nm之间调节。这种用于二次生长的方法也可以与不同AR的初级GNR一起使用,以实现不同的LSPR,并且可能扩展到不同形状的纳米颗粒和其他金属。
Gold nanorods (GNRs) exhibit a tunable longitudinal surface plasmon resonance (LSPR) that depends on the GNR aspect ratio (AR). Independently controlling the AR and size of GNRs remains challenging but is important because the scattering intensity strongly depends on the GNR size. Here, we report a secondary (seeded) growth procedure, wherein continuous addition of ascorbic acid (AA) to a stirring solution of GNRs, stabilized by cetyltrimethylammonium bromide (CTAB) and synthesized by a common GNR growth procedure, deposits the remaining (~70%) of the Au precursor onto the GNRs. The growth phase of GNR synthesis is often performed without stirring, since stirring has been believed to reduce the yield of rod-shaped nanoparticles, but we report that stirring coupled with continuous addition of AA during secondary growth allows improved control over the AR and size of GNRs. After a common primary GNR growth procedure, the LSPR of GNRs is ~820 nm, which can be tuned between ~700–880 nm during secondary growth by adjusting the rate of AA addition or adding benzyldimethylhexadecylammonium chloride hydrate (BDAC). This approach for secondary growth can also be used with primary GNRs of different ARs to achieve different LSPRs and can likely be extended to nanoparticles of different shapes and other metals.
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