Stimuli-responsive self-assembly of nanoparticles represents a powerful strategy to achieve reconfigurable materials with novel functionalities and promising applications. In this regard, light-induced reversible self-assembly (LIRSA) of nanoparticles is most attractive but it is usually limited by the prerequisite yet cumbersome chemical functionalizations of the particle surface. Here we describe an innovative method to realize LIRSA of gold nanorods (GNRs) without surface functionalization through photoswitchable adsorption of an anionic azobenzene derivate AzoNa. The LIRSA of GNRs is caused by the reversible change between a nearly neutral state and a highly charged state of the GNRs arising from the photoswichable adsorption of AzoNa triggered by photoisomerization. The LIRSA behavior can be readily adjusted by changing the concentration of AzoNa and the aspect ratio of the GNRs. This new LIRSA strategy may provide a convenient and efficient route toward light-triggered reversibly reconfigurable nanomaterials.

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纳米粒子的刺激响应自组装代表了一种强大的策略，可实现具有新颖功能和有前途应用的可重构材料。在这方面，纳米粒子的光诱导可逆自组装（LIRSA）最有吸引力，但通常受到粒子表面先决条件但繁琐的化学功能化的限制。在这里，我们描述了一种创新的方法，可通过阴离子偶氮苯衍生物AzoNa的光转换吸附来实现金纳米棒（GNR）的LIRSA，而无需进行表面功能化。GNRs的LIRSA是由GNRs的中性状态和高电荷状态之间的可逆变化引起的，该变化是由光异构化引发的偶氮钠的光固吸附引起的。通过改变AzoNa的浓度和GNR的长宽比，可以很容易地调节LIRSA的行为。这种新的LIRSA策略可为光触发可逆可重构纳米材料提供便捷有效的途径。

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