Liu Yun, Fu Weihua, Xu Zhongsheng, Zhang Liang, Sun Tao, Du Mengmeng, Kang Xun, Xiao Shilin, Zhou Chunyu, Gong Mingfu, Zhang Dong
Department of Radiology, Xinqiao Hospital, Army Medical University, Chongqing, China.
Department of Urology, Xinqiao Hospital, Army Medical University, Chongqing, China.
Front Chem. 2021 Apr 29;9:675491. doi: 10.3389/fchem.2021.675491. eCollection 2021.
Owing to the localized surface plasmon resonance (LSPR), dynamic manipulation of optical properties through the structure evolution of plasmonic nanoparticles has been intensively studied for practical applications. This paper describes a novel method for direct reversible self-assembly and dis-assembly of Au nanoparticles (AuNPs) in water driven by pH stimuli. Using 3-aminopropyltriethoxysilane (APTES) as the capping ligand and pH-responsive agent, the APTES hydrolyzes rapidly in response to acid and then condenses into silicon. On the contrary, the condensed silicon can be broken down into silicate by base, which subsequently deprotonates the APTES on AuNPs. By controlling condensation and decomposition of APTES, the plasmonic coupling among adjacent AuNPs could be reversible tuned to display the plasmonic color switching. This study provides a facile and distinctive strategy to regulate the reversible self-assembly of AuNPs, and it also offers a new avenue for other plasmonic nanoparticles to adjust plasmonic properties reversible self-assembly.
由于局域表面等离子体共振（LSPR），通过等离子体纳米颗粒的结构演化对光学性质进行动态操纵已针对实际应用进行了深入研究。本文描述了一种由pH刺激驱动的在水中直接可逆地自组装和拆卸金纳米颗粒（AuNPs）的新方法。使用3-氨丙基三乙氧基硅烷（APTES）作为封端配体和pH响应剂，APTES在酸性条件下迅速水解，然后缩合形成硅。相反，缩合的硅可以被碱分解成硅酸盐，随后使AuNPs上的APTES去质子化。通过控制APTES的缩合和分解，可以可逆地调节相邻AuNPs之间的等离子体耦合，以显示等离子体颜色切换。这项研究为调节AuNPs的可逆自组装提供了一种简便且独特的策略，也为其他等离子体纳米颗粒可逆地调节等离子体性质的自组装提供了一条新途径。
