多層複合奈米結構材料應用於環境微汙染氣體之化學感測系統研製(2/2)

Nano-porous ZnO are utilized as the sensing material on quartz crystal microbalance (QCM) for volatile organic compounds (VOCs) detection. The Nano-porous ZnO were synthesized by co-precipitation and followed by firing at 950oC to control the porosity and morphology. The porous structure of ZnO provides high surface area for organic vapor adsorption and accessible channels for vapor diffusion. A thin layer of poly vinyl chloride (PVC) serves as the adhesion layer between ZnO and the gold surface of QCM electrodes. The rapid and reversible response signals suggest that sensing process involved only physical adsorption. Four volatile organic compounds with various functional groups were tested to demonstrate the selectivity differences between polyvinylchloride (PVC) and porous ZnO. The finding in this work demonstrated that nano-porous ZnO can be used as a sensing material that can provide alternative selectivity and rapid response.