Seed-Mediated Growth of Ultra long Gold Nanorods and Nanowires with a Wide Range of Length Tunability
Seed-Mediated Growth of Ultra long Gold Nanorods and Nanowires with a Wide Range of Length Tunability
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DOI：
10.1021/la400985n
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发表时间：
2013-08-20
期刊：
影响因子：
3.9
通讯作者：
Huang, Michael H.
中科院分区：
文献类型：
--
作者：
Wang, Yu-Ning;Wei, Wen-Tsing;Huang, Michael H.
本研究报道了一种利用种子介导生长方法合成超长金纳米棒和纳米线的系统方法。在第一个系列中，研究了生长溶液pH对制备的纳米棒长度的影响。有趣的是，虽然在碱性溶液环境中产生的纳米棒（230-310 nm）比在酸性条件下（330-410 nm）产生的短，但纳米棒的产率大大提高，形成的纳米板副产物相对较少。纳米棒在碱性溶液中的生长速度很快，这可以从溶液颜色的快速变化中得到证明。通过调整几个实验参数，以可调的方式延长纳米棒的长度，逐步增加最终生长溶液中HNO3的浓度，可以合成平均长度为580 ~ 2850 nm的金纳米棒和纳米线。纳米线在高酸性溶液中的生长速度较慢，并且需要更长的时间才能达到较长的长度。进一步延长纳米线长度可以简单地通过减少转移到最终生长溶液的第二生长溶液的体积来实现。在这一系列的实验条件下，制备了长度从700 nm到4.5 μ m的纳米棒和纳米线。最长的纳米线可以达到6 pm的长度。纳米线的平均直径仍然保持在33-53纳米之间。在如此宽且有用的长度范围内制造金纳米棒和纳米线的能力是令人兴奋的，因为使用最合适长度的超长金纳米棒和纳米线的应用和演示现在是可能的。
This study reports a systematic approach to synthesize ultralong gold nanorods and nanowires using a seed-mediated growth approach. In the first series, the effect of growth solution pH on the lengths of nanorods prepared was investigated. Interestingly, although shorter rods (230-310 nm) were produced in a basic solution environment than in an acidic condition (330-410 nm), the nanorod yield is greatly improved with relatively few nanoplate byproducts formed. Nanorod growth proceeds quickly in a basic solution as evidenced by the fast solution color changes. By adjusting several experimental parameters with the aim to elongate the nanorod length in a tunable fashion, gold nanorods and nanowires with average lengths from 580 to 2850 nm can be synthesized by progressively increasing the HNO3 concentration in the final growth solution. Nanowire growth in a highly acidic solution is slower, and a substantially longer time is needed to reach long lengths. Further extension of the nanowire length can be achieved simply by reducing the volume of second growth solution transferred to the final growth solution. Nanorods and nanowires with lengths spanning from 700 nm to 4.5 mu m were prepared in this series of experimental conditions. The longest nanowires can reach a length of up to 6 pm. The nanowires still maintain thin average diameters of 33-53 nm. The ability to make gold nanorods and nanowires over this exceptionally wide and useful length range is exciting because applications and demonstrations using ultralong gold nanorods and nanowires of most suitable lengths are now possible.