Abstract
Detection of chemicals species such as industrial toxic and inflammable gasses, chemical warfare agents, disease related chemicals, is of paramount importance to public safety and health. The driving force is to develop highly sensitive, selective, and stable sensors with rapid detection and recovery time. Metal oxide thin films have long been used as chemical sensors due to the rich oxygen vacancies on the surface that are electrically and chemically active. The chemical adsorption induces redox reactions and consequently alters the electrical conductance. However, there have been a number of limitations: relatively high operation temperature, indirect and inefficient refreshing method, and lack of chemical selectivity. In the surge of quasi-one-dimensional (Q1D) metal oxide nanowire research, it is demonstrated that the unique shape anisotropy significantly enhances the sensor performances due to the large surface-to-volume ratio and size comparable to the Debye screening length. This not only enhances the sensitivity at room temperature, but provides efficient modulation of the surface detection and desorption processes. More importantly, it opens a pathway for developing wireless low-power sensor network to transmit information from a remote site. This chapter provides a review of the state-of-the-art research covering the synthesis and fundamental properties of Q1D metal oxide systems, and focusing on their applications as chemical sensors.
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Acknowledgments
The authors thank Dr. Dongdong Li at Shanghai Advanced Research Institute, Chinese Academy of Sciences and Mr. Miao Yu at Hong Kong University of Science and Technology for technical assistance on this chapter.
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Fan, Z., Lu, J.G. (2013). Metal Oxide Nanowires: Fundamentals and Sensor Applications. In: Carpenter, M., Mathur, S., Kolmakov, A. (eds) Metal Oxide Nanomaterials for Chemical Sensors. Integrated Analytical Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5395-6_9
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