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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 electrodeposited onto the flexible ITO substrate with HAuCl4 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 1fM1M, the bioelectrode resulted in a limiting detection of 0.255fM (calculated with 3.3 method), with a sensitivity of 10.94(Amol)cm2. 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.