Flexible ITO Electrode With Gold Nanostructures for Femtomolar DNA Hybridization Detection

In this article, we report detection of DNA hybridization using a gold nanostructure coated flexible indium tin oxide (ITO) working electrode, aiming at exploring alternate materials for developing low-cost light-weight sensing platforms in the future. Herein, gold nanostructures were electrodeposit...

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Bibliographic Details
Published in:IEEE sensors letters 2018-12, Vol.2 (4), p.1-4
Main Authors: Tripathy, Suryasnata, Joseph, Jose, Vanjari, Siva Rama Krishna, Rao, A.V.S.S. Narayana, Singh, Shiv Govind
Format: Article
Language:English
Subjects:
Biosensors
Chemical and biological sensors
Coated electrodes
Deoxyribonucleic acid
differential pulse voltammetry (DPV)
DNA
DNA hybridization
electrodeposition
flexible substrate
Gold
Hybridization
Indium tin oxides
Nanostructure
Self-assembly
Sensors
Serum albumin
Substrates
Test procedures
Weight reduction
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Summary:In this article, we report detection of DNA hybridization using a gold nanostructure coated flexible indium tin oxide (ITO) working electrode, aiming at exploring alternate materials for developing low-cost light-weight sensing platforms in the future. Herein, gold nanostructures were electrodeposited onto the flexible ITO substrate with HAuCl 4 precursor solution. To prepare the bioelectrode for DNA sensing, thiol-modified single-stranded DNA probes specific to the BRCA1 gene were attached to the nanostructured gold surface via self-assembly. When subjected to hybridization detection in a wide concentration range of 1 fM-1 μM, the bioelectrode resulted in a limiting detection of 0.255 fM (calculated with 3.3σ method), with a sensitivity of 10.94 (μA/mol)/cm 2 . In order to estimate the efficiency of the sensor, we have performed interference analysis in the presence of a noncomplementary target DNA and human serum albumin. Furthermore, the reproducibility of the biosensor was verified using a blind testing protocol.
ISSN:2475-1472
2475-1472
DOI:10.1109/LSENS.2018.2874232