期刊
BIOSENSORS & BIOELECTRONICS
卷 24, 期 9, 页码 2804-2809出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2009.02.007
关键词
Gold nanoparticles; Localized SPR biosensor; Absorbance sensor; U-bent fiber optic probe
类别
资金
- NMRL, India
- DIT, Govt. of India
The aim of this study is to develop an optical absorbance based biosensor suitable for wide scale use in resource-poor locales. A sensor for sensitive measurement of refractive index (RI) with the help of optical absorbance properties of gold nanoparticles (GNP) coupled to an efficient optical transducer in the form of a U-bent fiber optic probe is described. A U-bent probe was fabricated by a simple procedure. The absorbance due to the localized surface plasmon resonance (LSPR) of fiber-bound GNP was found to be linear to refractive index changes between 1.33 and 1.35. A U-bent probe of 200 mu m diameter with a bend radius of 0.75 mm gave rise to a sensitivity of 35 Delta A/RIU at 540 nm. The resolution of the sensor probe was 3.8 x 10(-5) RIU. Label-free biosensing was demonstrated using these probes with the help of IgG-anti IgG as bioreceptor-analyte pair. (C) 2009 Elsevier B.V. All rights reserved.
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