Selective deposition of a MOF at the spikes of Au nanostars for SERS detection  

作　　者：Yi Liu Ka Kit Chui Xinyue Xia Han Zhang Xiaolu Zhuo Jianfang Wang 

机构地区：[1]School of Science and Engineering,The Chinese University of Hong Kong,Shenzhen 518172,China [2]Department of Physics,The Chinese University of Hong Kong,Shatin,Hong Kong 999077,China [3]School of Materials Science and Engineering,Zhejiang Sci-Tech University,Hangzhou 310000,China

出　　处：《Nano Research》2024年第10期9166-9173,共8页纳米研究（英文版）

基　　金：supported by Hong Kong Innovation and Technology Commission(Innovation and Technology Support Programme(Seed),No.ITS/176/22);Shenzhen Science and Technology Innovation Commission(No.JSGGKQTD20221101115701006);the University Development Fund(No.UDF01002665);the Program of Guangdong Introducing Innovative and Entrepreneurial Teams(No.2019ZT08L101).

摘　　要：In the pursuit of advancing molecular sensing through surface-enhanced Raman spectroscopy(SERS),the combination of plasmonic nanoparticles and metal-organic frameworks(MOFs)has emerged as a highly effective approach to enhance the sensitivity and selectivity of SERS substrates.However,most prior investigations have predominantly focused on MOF-coated plasmonic nanoparticles in core@shell or layer-by-layer configurations,leaving a notable knowledge gap in exploring alternative configurations.Herein we present a facile method to construct a particle-on-mirror architecture by selectively coating a MOF,zeolitic imidazolate framework-8(ZIF-8),onto the tips of Au nanostars and subsequently depositing the resultant nanoparticles onto a Au film.This design integrates the electric field enhancement at the sharp tips and nanogaps,along with the molecular enrichment function within the porous MOF immobilized at the tips and nanogaps,leading to a substantial boost in the SERS signal intensity.Such a unique SERS platform enables consistent and outstanding SERS performance for analytes of different sizes.This work opens up a promising strategy for constructing multifunctional nanostructures for sensitive SERS detection in real-life scenarios.

关 键 词：electric field enhancement gold nanostars metal-organic frameworks molecular enrichment plasmon coupling surfaceenhanced Raman spectroscopy(SERS)substrates 

分 类 号：O65[理学—分析化学]