Nanosecond Time-Resolution Study of Gold Nanorod Rotation at the Liquid-Solid Interface.
Nanosecond Time-Resolution Study of Gold Nanorod Rotation at the Liquid-Solid Interface.
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DOI：
10.1002/cphc.201600174
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发表时间：
2016-07
期刊：
影响因子：
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通讯作者：
B. Neupane;Fang Chen;Yanli Wei;Ning Fang;F. Ligler;Gufeng Wang
中科院分区：
文献类型：
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作者：
B. Neupane;Fang Chen;Yanli Wei;Ning Fang;F. Ligler;Gufeng Wang
早期的研究表明，纳米棒的吸附可能始于一种特殊的“锚定”状态，在这种状态下，纳米棒失去了平移运动，但保留了旋转自由度。深入了解锚定的纳米棒如何旋转应该为理解颗粒表面相互作用提供额外的维度。基于传统的时间分辨率研究，金纳米棒被认为在与带负电荷的玻璃表面的初始相互作用后连续旋转。然而，这个纳秒时间分辨率的研究表明，明显的连续旋转实际上是由许多快速，间歇性的旋转或少量弱固定状态之间的转换，与粒子静止在固定状态的大部分时间。从一种固定状态到另一种固定状态的实际旋转发生在1 ms的时间尺度上，即比本体溶液中慢约50倍。
Early studies showed that the adsorption of nanorods may start from a special "anchored" state, in which the nanorods lose translational motion but retain rotational freedom. Insight into how the anchored nanorods rotate should provide additional dimensions for understanding particle-surface interactions. Based on conventional time-resolution studies, gold nanorods are thought to continuously rotate following initial interactions with negatively charged glass surfaces. However, this nanosecond time-resolution study reveals that the apparent continuous rotation actually consists of numerous fast, intermittent rotations or transitions between a small number of weakly immobilized states, with the particle resting in the immobilized states most of the time. The actual rotation from one immobilized state to the other happens on a 1 ms timescale, that is, approximately 50 times slower than in the bulk solution.