Selective real-time nitric oxide detection by functionalized zinc oxide

Chien Cheng Liu, Jan Hao Li, Cheng Chung Chang, Yu Chiang Chao, Hsin-Fei Meng*, Sheng Fu Horng, Cheng Hsiung Hung, Tzu Ching Meng

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

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 2 and O 2 . 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.

Original languageEnglish
Article number155105
JournalJournal of Physics D: Applied Physics
Volume42
Issue number15
DOIs
StatePublished - 17 Sep 2009

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