Fabrication of a Large-Scale Plasmonic Nanojunction for Chemical Sensing

Wen Yu Liao, Jyue Rong Huang, Su Wen Hsu

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

Plasmonic coupling between nanojunctions showed potential applications in bio/chemical sensing. The most common method of fabricating large-scale ordered arrays was using direct-writing techniques, such as lithography. There were some drawbacks to this approach: it is complicated and expensive, and sub-nanoscale spacing between nanocrystals was poorly controlled. Here, we demonstrated that layer-by-layer deposition and polymer-directed assembly of nanocrystals can be integrated to fabricate large-scale dimer nanojunctions with controllable spacing, conformations, and quantity of dimer nanojunctions. When silver nanocube (AgNC) is used as building blocks to fabricate high-quality dimer nanojunctions in the polymer matrix, the thickness of the polymer matrix played an important role in tuning the interplane and intraplane interactions between nanocrystals, resulting in different conformational dimer nanojunctions: vertical dimers (face-to-face assembly) and horizontal dimers (edge-to-edge assembly). The optical properties of large-scale dimer nanojunctions strongly depended on their conformations, which were caused by electromagnetic field coupling, also known as hot spots, between the nanocrystals. Hot spots in both types of dimer nanojunctions can be used to amplify chemical signals in the Raman spectrum with an enhancement factor (EF) of about 103 compared with the pure polymer film. This high EF in the Raman spectrum made these dimer nanojunctions suitable for sensing applications. This fabrication technique can produce high-quality and quantitatively controllable dimer nanojunction structures with highly sensitive sensing applications in the fields of biology, biomedicine, and chemistry.

原文English
頁(從 - 到)5722-5732
頁數11
期刊ACS Applied Nano Materials
5
發行號4
DOIs
出版狀態Published - 2022 4月 22

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)

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