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Ultra-sensitive hydrogen gas sensing using DNA-templated palladium nanowires

Lookup NU author(s): Professor Nick Wright, Dr Alton Horsfall, Dr Reda Hassanien, Dr Ben Horrocks, Professor Andrew Houlton

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Abstract

This paper focuses on an ultra-sensitive H-2 sensor fabricated using a time and cost-effective method. The sensor is comprised of Pd nanowires fabricated using lambda-DNA templates. The morphology and the electrical characterisation of the metalized DNA nanowires (diameter = 5-45nm) were investigated by AFM and conductive AFM (cAFM). The conductivity of a single Pd-DNA nanowire, 127 Scm(-1) was substantially lower than that of bulk Pd (9.5x10(4) Scm(-1)). However, the sensor shows high sensitivity towards hydrogen evaluated by recording the change in the resistance on exposure to cycles of different concentrations of H-2 in N-2 flow at 330K. The sensor showed a reversible response to H-2 concentrations between 2300 -12500 ppm and a response time of similar to 85 s. These results indicate that using DNA as a template is a promising method for the fabrication of low cost and rapid response sensors.


Publication metadata

Author(s): Al Hinai M, Wright N, Horsfall A, Hassanien R, Horrocks B, Houlton A

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: IEEE Sensors

Year of Conference: 2011

Pages: 1-4

ISSN: 1930-0395

Publisher: IEEE

URL: http://dx.doi.org/10.1109/ICSENS.2011.6127155

DOI: 10.1109/ICSENS.2011.6127155

Library holdings: Search Newcastle University Library for this item

ISBN: 9781424492909


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