Site-Selective Deposition of Metal–Organic Frameworks on Gold Nanobipyramids for Surface-Enhanced Raman Scattering,Nano Letters

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Site-Selective Deposition of Metal–Organic Frameworks on Gold Nanobipyramids for Surface-Enhanced Raman Scattering
Nano Letters ( IF 9.6 ) Pub Date : 2021-09-17 , DOI: 10.1021/acs.nanolett.1c02649
Xueqing Yang _{1,

2} , Yi Liu ₂ , Shiu Hei Lam ₂ , Jing Wang ₁ , Shizheng Wen ₁ , ChiYung Yam _{1,

3} , Lei Shao _{1,

3} , Jianfang Wang ₂

Affiliation

Site-selective deposition of metal–organic frameworks (MOFs) on metal nanocrystals has remained challenging because of the difficult control of the nucleation and growth of MOFs. Herein we report on a facile wet-chemistry approach for the selective deposition of zeolitic imidazolate framework-8 (ZIF-8) on anisotropic Au nanobipyramids (NBPs) and nanorods. ZIF-8 is selectively deposited at the ends and waist and around the entire surface of the elongated Au nanocrystals. The NBP-based nanostructures with end-deposited ZIF-8 exhibit the best surface-enhanced Raman scattering (SERS) performance, implying that molecules can be concentrated by ZIF-8 at the hot spots. In addition, the SERS signal exhibits good selectivity for small molecules because of the molecular sieving effect of ZIF-8. This study opens up a promising route for constructing plasmonic nanostructures with site selectively deposited ZIF-8, which hold enormous potential for molecular sensing, optical switching, and plasmonic catalysis.

中文翻译：

用于表面增强拉曼散射的金纳米双锥体上金属-有机骨架的位点选择性沉积

由于 MOF 的成核和生长难以控制，金属有机骨架 (MOF) 在金属纳米晶体上的位点选择性沉积仍然具有挑战性。在此，我们报告了一种简便的湿化学方法，用于在各向异性 Au 纳米双锥 (NBP) 和纳米棒上选择性沉积沸石咪唑酯骨架 8 (ZIF-8)。ZIF-8 选择性地沉积在拉长的 Au 纳米晶体的末端和腰部以及整个表面周围。末端沉积 ZIF-8 的基于 NBP 的纳米结构表现出最佳的表面增强拉曼散射 (SERS) 性能，这意味着分子可以被 ZIF-8 聚集在热点处。此外，由于 ZIF-8 的分子筛作用，SERS 信号对小分子表现出良好的选择性。

更新日期：2021-10-13

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