Highly sensitive CO sensor based on Al-doped-ZnO nanorods-coated resonant microcantilevers

Lia Aprilia, Ratno Nuryadi, Makoto Hosoda, Mohammad Abdul Barique, Arief Udhiarto, Djoko Hartanto, Yoichiro Neo, Hidenori Mimura

Research output: Contribution to journalArticlepeer-review

Abstract

A highly sensitive (at the picogram order) Al-doped-ZnO nanorods (AZNRs)-coated resonant microcantilever (MC) for carbon monoxide (CO) gas sensing, operable at ambient temperature and under humid condition was synthesized. The ZnO nanorods were grown on the MC surface by using the hydrothermal method and doped by aluminum (Al). The sensitivities of un-doped and AZNRs for various CO gas concentrations were investigated by measuring the changes in the resonant frequencies and the Q-factor analysis of the vibrating MCs. The mechanisms of the remarkable enhancement of the sensitivity of the AZNRs-coated-microcantilever to CO were thoroughly investigated and discussed on the basis of energy gap between the highest occupied molecular orbital-lowest occupied molecular orbital of AZNRs and CO, active surface area of AZNRs, and the interaction of water vapor on AZNRs surface with CO.

Original languageEnglish
Article number077003
JournalJapanese Journal of Applied Physics
Volume59
Issue number7
DOIs
Publication statusPublished - 1 Jul 2020

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