Nano Archive

Electrochemical DNA biosensors based on thin gold films sputtered on capacitive nanoporous niobium oxide

Rho, Sangchul and Jahng, Deokjin and Lim, Jae Hoon and Choi, Jinsub and Chang, Jeong Ho and Lee, Sang Cheon and Kim, Kyung Ja (2007) Electrochemical DNA biosensors based on thin gold films sputtered on capacitive nanoporous niobium oxide. BIOSENSORS & BIOELECTRONICS, 23 (6). pp. 852-856.

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Electrochemical DNA biosensors based on a thin gold film sputtered on anodic porous niobium oxide (Au@Nb2O5) are studied in detail here. We found that the novel DNA biosensor based on Au@Nb2O5 is superior to those based on the bulk gold electrode or niobium oxide electrode. For example, the novel method does not require any time-consuming cleaning step in order to obtain reproducible results. The adhesion of gold films on the substrate is very stable during electrochemical biosensing, when the thin gold films are deposited on anodically prepared nanoporous niobium oxide. In particular, the novel biosensor shows enhanced biosensing performance with a 2.4 times higher resolution and a three times higher sensitivity. The signal enhancement is in part attributed to capacitive interface between gold films and nanoporous niobium oxide, where charges are accumulated during the anodic and cathodic scanning, and is in part ascribed to the structural stability of DNA immobilized at the sputtered gold films. The method allows for the detection of single-base mismatch DNA as well as for the discrimination of mismatch positions.

Item Type:Article
Uncontrolled Keywords:anodization; niobium oxide; porous oxide; electrochemical biosensor; capacitance
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Physical Science > Nano objects
Biomedical Science > Nanotechnology for human health
ID Code:5983
Deposited By:IoN
Deposited On:05 Aug 2009 10:25
Last Modified:05 Aug 2009 10:25

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