ZnO thin film with nanorod arrays applied to fluid sensor

Walter Water; Shih-En Chen; Teen-Hang Meen; Liang-Wen Ji

doi:10.1016/j.ultras.2012.02.001

ZnO thin film with nanorod arrays applied to fluid sensor

Ultrasonics. 2012 Aug;52(6):747-52. doi: 10.1016/j.ultras.2012.02.001. Epub 2012 Feb 15.

Authors

Walter Water¹, Shih-En Chen, Teen-Hang Meen, Liang-Wen Ji

Affiliation

¹ Department of Electronic Engineering, National Formosa University, Yunlin 632, Taiwan. wwater@nfu.edu.tw

PMID: 22406131
DOI: 10.1016/j.ultras.2012.02.001

Abstract

A ZnO guiding layer with nanorod arrays grown on a 90°-rotated ST-cut (42°45) quartz substrate was used to fabricate a Love wave fluid sensor. ZnO nanorod arrays synthesized on the guiding layer enhance the sensitivity of the flow rate. ZnO thin films were deposited by radio frequency magnetron sputtering and ZnO nanorod arrays were then synthesized on the thin films via the hydrothermal method. The crystalline structure and surface morphology of ZnO thin films and nanorod arrays were examined by X-ray diffraction and scanning electron microscopy. The effects of the thickness of ZnO thin film and the surface morphology of ZnO nanorod arrays on the sensitivity of flow rate were investigated. A linear response between flow rate and the return loss of the sensor with one-port resonator type can be obtained by adjusting the thickness of ZnO thin film and the length of nanorod arrays.