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