A UV-Activated Room-Temperature Gas Sensor Based on Hydrothermally Grown Zinc Oxide Nanowires
Date Issued
2014
Date
2014
Author(s)
Lin, Tsu-Hung
Abstract
In this research, a novel volatile organic compound (VOC) sensing layer was fabricated. The advantage of the fabrication is the low cost and the simple equipment. We use the Zinc Oxide (ZnO) as the sensing material to detect the reduction gas. By the characteristic of oxidation of the surface of ZnO, the oxygen ion will become reduction when the surface is in the environment with volatile organic compound.
ZnO seed layers were deposited by RF Sputter. ZnO nanowires were grown in aqueous of zinc acetate and hexamethylenetetramine. With UV pretreatment, ZnO nanowires change from flower-like to well-aligned and vertical growth nanowires. The different nanowires morphologies can be fabricated by different growth time and high temperature annealing. The ZnO films were characterized by field-emission scanning electron microscopy (FE-SEM) to illustrate the morphologies.
The signal of the nanowires structure was linear with the different concentration. The nanowires structure not only enhances light absorption but also the gas sensing results. On the other hand, we use the hydrothermal method to fabricate nanowires on the metallic interdigitated electrodes and apply this technology to gas sensing area successfully.
Subjects
水熱法
氧化鋅
金屬氧化物氣體感測器
氣體響應
UV光激發
Type
thesis
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