Synthesis and characterization of Cu-doped ZnO one-dimensional structures for 
miniaturized sensor applications with faster response

Chow, Lee; Lupan, Oleg; Chai, Guangyu; Khallaf, Hani; Ono, Luis Katsuya; Roldan Cuenya, Beatriz; Tiginyanu, Ion; Ursaki, Veaceslav V.; Sontea, Victor; Schulte, Alfons

doi:10.1016/j.sna.2012.09.006

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Synthesis and characterization of Cu-doped ZnO one-dimensional structures for miniaturized sensor applications with faster response

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Chow, L., Lupan, O., Chai, G., Khallaf, H., Ono, L. K., Roldan Cuenya, B., et al. (2013). Synthesis and characterization of Cu-doped ZnO one-dimensional structures for miniaturized sensor applications with faster response. Sensors and Actuators A, 189, 399-408. doi:10.1016/j.sna.2012.09.006.

Cite as: https://hdl.handle.net/21.11116/0000-0006-CD06-D

Abstract

Detection of chemicals and biological species is an important issue to human health and safety. In this paper, we report the hydrothermal synthesis at 95 °C of Cu-doped ZnO low-dimensional rods for room-temperature (RT) sensing applications and enhanced sensor performances. X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman and photoluminescence are used to characterize the material properties. To demonstrate the suitability of the Cu-doped ZnO rods for gas sensor applications and for comparison with pure ZnO, we fabricated a double rod device using Focused Ion Beam. The responses of pure-ZnO and Cu-doped ZnO rods studied in exactly the same condition are reported. We found that Cu-ZnO sensors have enhanced RT sensitivity, faster response time, and good selectivity. Miniaturized Cu-ZnO rod-based sensors can serve as a good candidate for effective H₂ detectors with low power consumption.