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Chemiresistive NO Gas Sensor Based on Zinc Oxide Nanorods

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The synthesis of zinc oxide (ZnO) nanorods and their sensing properties with respect to nitric oxide (NO) gas were studied. The ZnO nanorods were grown by the hydrothermal method onto a ZnO thin film (∼150 nm), which was designated as the ZnO thin film/ZnO nanorods. The ZnO thin film was pre-sputtered on the Au interdigitated electrode. By repeating the growth in a fresh precursor from one cycle to four cycles, the aspect ratio of the nanorods increased approximately from 10 to 33. For NO gas sensor application, however, the sensitivity decreased as the aspect ratio of the ZnO nanorods increased. It's very likely that higher density and higher aspect ratio of ZnO nanorods prevent NO gas from penetrating into the ZnO nanorods. The optimal operation temperature for the ZnO thin film/ZnO nanorods with an aspect ratio of 10 was found to be 240 °C for sensing NO gas. The limit of detection reached 2 ppb which is applicable for asthma diagnosis. To simulate human breath, cross-sensitivities with respect to CO2 and O2 have been tested.
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Document Type: Research Article

Publication date: December 1, 2008

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  • Bionanoscience attempts to harness various functions of biological macromolecules and integrate them with engineering for technological applications. It is based on a bottom-up approach and encompasses structural biology, biomacromolecular engineering, material science, and engineering, extending the horizon of material science. The journal aims at publication of (i) Letters (ii) Reviews (3) Concepts (4) Rapid communications (5) Research papers (6) Book reviews (7) Conference announcements in the interface between chemistry, physics, biology, material science, and technology. The use of biological macromolecules as sensors, biomaterials, information storage devices, biomolecular arrays, molecular machines is significantly increasing. The traditional disciplines of chemistry, physics, and biology are overlapping and coalescing with nanoscale science and technology. Currently research in this area is scattered in different journals and this journal seeks to bring them under a single umbrella to ensure highest quality peer-reviewed research for rapid dissemination in areas that are in the forefront of science and technology which is witnessing phenomenal and accelerated growth.
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