Seedless Synthesis of Single Crystalline Au Nanoparticles with Unusual Shapes and Tunable LSPR in the near-IR
Seedless Synthesis of Single Crystalline Au Nanoparticles with Unusual Shapes and Tunable LSPR in the near-IR
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DOI：
10.1021/cm3004479
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发表时间：
2012-04-10
影响因子：
8.6
通讯作者：
Liz-Marzan, Luis M.
中科院分区：
文献类型：
--
作者：
Angelome, Paula C.;Mezerji, Hamed Heidari;Liz-Marzan, Luis M.
金属纳米粒子的等离子体激元性质由于其在非常广泛的领域中的潜在应用而获得了极大的重视。在近红外（NIP.，750-1300 nm）是特别令人感兴趣的，因为组织、血液和水在该光谱范围内显示出低吸收，从而有利于生物医学应用。十六烷基三甲基氯化铵（CTAC）是用来诱导种子形成高度各向异性，扭曲的单晶Au纳米粒子在一个单一的步骤。通过简单地改变反应温度或试剂浓度，可以将所获得的颗粒的LSPR从600 nm调谐到1400 nm。LSPR的可调性与最终颗粒形态的显著变化密切相关，这是通过先进的电子显微镜技术（3D断层扫描和HAADF-STEM）研究的。动力学实验进行了建立的生长机制，这表明，缓慢的动力学与络合的金盐前体的CTAC是有利于形成这些各向异性颗粒的关键因素。
The plasmonic properties of metal nanoparticles have acquired great importance because of their potential applications in very diverse fields. Metal nanoparticles with localized surface plasmon resonances (LSPR) in the near-infrared (NIP., 750-1300 nm) are of particular interest because tissues, blood, and water display low absorption in this spectral range, thus facilitating biomedical applications. Cetyltrimethylammonium chloride (CTAC) was used to induce the seedless formation of highly anisotropic, twisted single crystalline Au nanoparticles in a single step. The LSPR of the obtained particles can be tuned from 600 nm up to 1400 nm by simply changing the reaction temperature or the reagents concentrations. The tunability of the LSPR is closely associated with significant changes in the final particle morphology, which was studied by advanced electron microscopy techniques (3D Tomography and HAADF-STEM). Kinetic experiments were carried out to establish the growth mechanism, suggesting that slow kinetics together with the complexation of the gold salt precursor to CTAC are key factors favoring the formation of these anisotropic particles.