Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 189, Issue -, Pages 399-408Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2012.09.006
Keywords
ZnO; Crystal; Sensor; Microrod; Cu-doping
Funding
- National Science Foundation [NSF-DMR-0906562]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0906562] Funding Source: National Science Foundation
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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 degrees 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 H-2 detectors with low power consumption. (C) 2012 Elsevier B.V. All rights reserved.
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