Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30223
Title: Label-free, disposable fiber-optic biosensors for DNA hybridization detection
Authors: Yin, MJ
Wu, C
Shao, LY
Chan, WKE
Zhang, AP 
Lu, C 
Tam, HY 
Issue Date: 2013
Source: Analyst, 2013, v. 138, no. 7, p. 1988-1994 How to cite?
Journal: Analyst 
Abstract: A novel and highly sensitive fiber-optic DNA sensor based on a thin-core fiber modal interferometer (TCFMI) is demonstrated by using a layer-by-layer (LbL) self-assembly technology. Poly(ethylenimine) (PEI), poly(acrylic acid) (PAA) and single-stranded DNA (ssDNA) were used for the preparation of a polyelectrolyte multilayer film for DNA detection. The film thickness was measured through a surface profilometer. The surface morphologies of (PEI/PAA)4, (PEI/PAA)4.5 and (PEI/PAA)4(PEI/ DNA)1 multilayer films were characterized by atomic force microscopy. The fabricated DNA sensors were tested with different types of target ssDNA solutions with a concentration of 1 μM. The results show that the sensitivity of the TCFMI-based ssDNA sensor is 0.27 nm/matched-base at the concentration of 1 μM and can even distinguish the number of matched bases of ssDNA chains.
URI: http://hdl.handle.net/10397/30223
ISSN: 0003-2654
DOI: 10.1039/c3an36791f
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