Visible‐Light‐Induced Reversible Self‐Assembly of Gold Nanorattles Using Anionic ortho‐Fluoroazobenzene
Visible‐Light‐Induced Reversible Self‐Assembly of Gold Nanorattles Using Anionic ortho‐Fluoroazobenzene
复制标题
使用阴离子邻氟偶氮苯可见光诱导金纳米摇铃的可逆自组装
DOI：
10.1002/ppsc.202200123
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发表时间：
2022
影响因子：
2.7
通讯作者：
Norikane Yasuo
中科院分区：
文献类型：
--
作者：
Saito Koichiro;McGehee Keegan;Norikane Yasuo
等离子体激元粒子的受控组装对于催化剂和传感器应用至关重要。由于光被认为是一种有前途的外部刺激，各种方法组装等离子体粒子使用光开关分子进行了研究。然而，用于光异构化这些分子的光通常限于UV区域。在这项研究中，合成了阴离子邻氟偶氮苯，以可逆地控制等离子体纳米粒子在绿色和蓝色可见光下的自组装。这种偶氮苯通过可见光照射改变了由阳离子表面活性剂保护的立方体金纳米晶体的结晶，导致溶液颜色的可见变化。阳离子表面活性剂和阴离子偶氮苯相互作用可能中和了金纳米晶格的表面电荷。由于偶氮苯的光致异构作用改变了相互作用，金纳米柱的聚集和再分散具有可重复性。通过这种方法，可以仅使用可见光照射来控制非球形等离子体激元粒子的散射。
Controlled assembly of plasmonic particles is vital for catalyst and sensor applications. Because light is considered a promising external stimulus, various methods for assembling plasmonic particles using photoswitching molecules are investigated. However, the light used to photoisomerize such molecules is often limited to the UV region. In this study, anionicortho‐fluoroazobenzene is synthesized to reversibly control the self‐assembly of plasmonic nanoparticles under only green and blue visible light. This azobenzene alters the dispersibility of cubic gold nanorattles protected by a cationic surfactant via visible‐light irradiation, causing a visible change in the solution color. It is possible that the cationic surfactant and anionic azobenzene interact to neutralize the surface charge of the gold nanorattles. Because the interaction is changed by the photoisomerization of azobenzene, the aggregation and redispersion of the gold nanorattles are repeatable. Through this method, the dispersibility of nonspherical plasmonic particles can be controlled using only visible‐light irradiation.