Journal
BIOSENSORS & BIOELECTRONICS
Volume 25, Issue 10, Pages 2270-2275Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2010.03.007
Keywords
Surface-enhanced Raman scattering (SERS); Optical fiber; Nanoparticles; Self-assembly; Raman imaging; Remote sensing
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Funding
- NSERC
- NSERC Strategic Network for Bioplasmonic Systems (Biop-Sys), Canada
- Canada Foundation for Innovation (CFI)
- British Columbia Knowledge and Development Fund (BCKDF)
- University of Victoria
- Canadian Bureau for International Education - Department of Foreign Affairs and International Trade (CBIE-DFAIT) of Canada
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This work presents the construction and optimization of nanoparticles-modified optical fiber tip (NPs-MOFT) devices for remote sensing by surface-enhanced Raman scattering (SERS). Silver nanoparticles (Ag-NPs) were self-assembled on optical fiber tips through a layer-by-layer procedure. It is shown that the SEAS performance is at optimum when 5 layers of 50 nm Ag-NPs were deposited on the optical fiber tip. Using the optimized Ag-NPs-MOFT device, it was possible to detect 200 nM of the R6G dye in remote sensing mode (backscattering through the fiber). It was also possible to detect dye molecules with different structures and charges at the micro-molar concentration level, including anions, cations and neutral species. It can be envisioned that the Ag-NPs-MOFT device reported in this work can be further developed for SERS-based remote biosensing. (C) 2010 Elsevier B.V. All rights reserved.
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