氧化鋅/二氧化錫空心球複合材料應用於 高靈敏度及低檢測限的乙醇氣體感測器

Abstract

利用溶液法合成了具有中空奈米結構的異質結構ZnO/SnO2 複合材料。通過X射線繞射（XRD）、場發射電子掃描顯微鏡（FESEM）、透射電子顯微鏡（TEM）和X射線光電子顯微鏡（XPS）進行材料分析。結果表明，在SnO2空心球表面可以清晰地觀察到ZnO奈米顆粒，ZnO / SnO2複合材料的表面氧化學吸附能力比單一成分的SnO2高得多。對合成後的複合材料作為感測材料進行了研究，結果表明，這種複合材料對乙醇具有優異的感測性能，在最佳溫度下，對30ppm乙醇的應答比原始SnO2的應答高達將近7倍。 此外，值得注意的是，這種氣體感測器顯示出低檢測限（ppb級）。增強的感測性能可能歸因於異質結構的形成和SnO2與ZnO之間的協同作用。

Heterostructure ZnO/SnO2 composites material with a hollow nanostructure was synthesized by solution method. The obtained products were characterized by X-ray diffraction (XRD), field-emission electron scanning microscopy (FESEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results indicated that ZnO nanoparticles could be clearly observed on the surface of SnO2 hollow spheres and the surface oxygen chemisorbed ability of ZnO/SnO2 composites was much higher than that of single-component SnO2. The as-synthesized composites as sensing material was investigated and the results revealed that such composites had an excellent sensing performance to ethanol, and the response to 30 ppm ethanol was nearly 7-times higher than that of pristine SnO2at its optimum temperature. Moreover, it is noteworthy that such gas sensor showed a low detection limit (ppb-level). The enhanced sensing properties might be attributed to the formation of heterojunction and synergistic effect between SnO2 and ZnO.