Synthesis of Absorption-Dominant Small Gold Nanorods and Their Plasmonic Properties
Synthesis of Absorption-Dominant Small Gold Nanorods and Their Plasmonic Properties
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DOI：
10.1021/acs.langmuir.5b01444
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发表时间：
2015-07-07
期刊：
影响因子：
3.9
通讯作者：
Wang, Jianfang
中科院分区：
文献类型：
--
作者：
Jia, Henglei;Fang, Caihong;Wang, Jianfang
采用简单的种子介导生长方法制备了直径小于10 nm的吸收主导的小Au纳米棒。小的金纳米棒的直径范围从6到9 nm，并且它们的长度从16到45 rim变化。它们的纵横比可以从2.7到4.7定制。结果，通过改变生长溶液中的晶种与Au（III）的摩尔比，可以容易地将纵向等离子体共振波长从近似720 nm调谐到近似830 nm。在小Au纳米棒的总消光中的散射的分数被发现是在0.005至0.025的范围内与有限差分时域模拟，确认这些小Au纳米棒的消光值主要由光吸收贡献。而且，小的Au纳米棒样品被涂有致密的二氧化硅层，用于三种细胞系的光热治疗。对于相同的细胞Au含量，与大的Au纳米棒样品相比，其显示出改善的光热治疗性能。我们的研究表明，小Au纳米棒是有前途的光吸收剂和光热治疗剂。
Absorption-dominant small Au nanorods with diameters of less than 10 nm are prepared using a facile seed-mediated growth method. The diameters of the small gold nanorods range from 6 to 9 nm, and their lengths vary from 16 to 45 rim. Their aspect ratios can be tailored from 2.7 to 4.7. As a result, the longitudinal plasmon resonance wavelengths are readily tunable from similar to 720 nm to similar to 830 nm by changing the seed-to-Au(III) molar ratio in the growth solution. The fractions of the scattering in the total extinction of the small Au nanorods are found to be in the range of 0.005 to 0.025 with finite-difference time-domain simulations, confirming that the extinction values of these small Au nanorods are dominantly contributed to by the light absorption. Moreover, the small Au nanorod sample is coated with a dense silica layer for photothermal therapy with three cell lines. It shows improved photothermal therapy performance compared to a large Au nanorod sample for the same cellular Au contents. Our study suggests that small Au nanorods are promising light absorbers and photothermal therapy agents.