Selective real-time nitric oxide detection by functionalized zinc oxide
Liu, Chien-Cheng; Li, Jan-Hao; Chang, Cheng-Chung; Chao, Yu-Chiang; Meng, Hsin-Fei; Horng, Sheng-Fu; Hung, Cheng-Hsiung; Meng, Tzu-Ching; Liu, Chien-Cheng; Department of Electric Engineering, National Tsing Hua University, Hsinchu 300, Taiwan; Li, Jan-Hao; Department of Electric Engineering, National Tsing Hua University, Hsinchu 300, Taiwan; Chang, Cheng-Chung; Department of Electric Engineering, National Tsing Hua University, Hsinchu 300, Taiwan; Chao, Yu-Chiang; Institute of Physics, National Chiao Tung University, Hsinchu 300, Taiwan; Meng, Hsin-Fei; Institute of Physics, National Chiao Tung University, Hsinchu 300, Taiwan;; Horng, Sheng-Fu; Department of Electric Engineering, National Tsing Hua University, Hsinchu 300, Taiwan; Hung, Cheng-Hsiung; Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan; Meng, Tzu-Ching; Institute of Biological Chemistry, Academia Sinica, Taipei 115, Taiwan
Журнал:
Journal of Physics D: Applied Physics
Дата:
2009-08-07
Аннотация:
Ferriprotoporphyrin IX chloride (haemin)-functionalized Al-doped zinc oxide (ZnO) is used for nitric oxide (NO) sensing at room temperature. The devices show high selectivity to NO against CO<sub>2</sub> and O<sub>2</sub>. There is no such selectivity without haemin. Porous ZnO film made by a polystyrene sphere template is used to provide a high surface area. In comparison with non-porous ZnO film with low surface area, both the sensitivity and the response speed of the sensor made by porous ZnO are clearly improved. NO concentration down to 1 ppm can be detected. The response time is 20 s. The sensor is reversible after purging with pure nitrogen for about 100 s. Such a device is able to detect real-time variation of NO which is a vital physiological signalling molecule.
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