Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 201, Issue -, Pages 173-176Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.04.091
Keywords
Surface-enhanced Raman spectroscopy; Immunological recognition; Porous anodic alumina; Waveguide resonance; Localized surface plasmons
Funding
- National Natural Science Foundation of China [21373096, 91027010, 21073073]
- National Instrumentation Program of the Ministry of Science and Technology of China [2011YQ03012408]
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A measurement of antigen-antibody binding in the porous anodic alumina (PAA) waveguide layer via waveguide-assisted surface-enhanced Raman spectroscopy (SERS) was demonstrated. The highest SERS signals of dye-labeled antibody molecules were recorded under the waveguide resonance modes, where most of the light is confined in the waveguide layer to generate localized surface plasmon resonance of Ag nanoparticles under the evanescent field, resulting in an enhanced electromagnetic field. It is a useful configuration for biosensing. Results showed that the PAA waveguide is advantageous in sensing biomolecules with high sensitivity. We performed the SERS detection of immune-recognition with a concentration as low as 0.1 ng/ml level through this method. (C) 2014 Elsevier B.V. All rights reserved.
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