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ZIF-Mediated Gold Nanorod Assembly for Surface-Enhanced Raman Scattering Detection of 4‑Nitrobenzenethiol

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posted on 16.12.2021, 13:06 authored by Suhyeon Park, Cheongwon Bae, Jaedeok Lee, Jeongeon Kim, Ming Lin, Juyeong Kim
Nanoparticle assemblies exhibit unique properties compared to single entities due to interactions between their building blocks. Although the development of large-area assemblies has been extensively studied, finite nanoparticle assemblies with tens of building blocks have not been adequately explored. Here, we prepared a finite assembly of anisotropic gold nanorods through encapsulation by a zeolitic imidazolate framework-8 (ZIF). The three-dimensional reconstruction of the ZIF-encapsulated nanorod assembly indicated that the assembled nanorods are separate bundles aligned side-by-side, each of which serves as a nucleation center for a cube-shaped ZIF domain. Further experiments showed that the assembly pattern and the shell dimension can be controlled by the cysteamine and surfactant concentrations. Moreover, the ZIF-encapsulated nanorod assembly had twice the surface-enhanced Raman scattering signal of a single nanorod and showed higher selectivity for 4-nitrobenzenethiol versus rhodamine 6G. Our model system will significantly contribute to the development of finite anisotropic nanoparticle assemblies with microporous metal–organic framework shells and extend their applicability.