氧化石墨烯製程改善:防蝕性能探討與濕度感測器之應用

本研究係以粉狀石墨透過改良之Hummers法，於製程中比較溫度控制與否，及氧化石墨烯粉體之乾燥方法，對於材料特性之影響。透過X-射線繞射分析、拉曼光譜、傅立葉轉換紅外光譜佐證氧化石墨烯之結晶狀況、缺陷狀態及氧化官能團分布，以掃描式電子顯微鏡觀察其粉體表面型態，再經由氮氣吸附-脫附曲線、界面電位儀比較不同製程造成的表面積及界面電位差異。本研究以氧化石墨烯依電泳沉積方式做應用，披覆氧化石墨烯薄膜於金屬基板上，作為金屬防腐蝕之檔層。氧化石墨烯其豐富的官能團及缺陷令其擁有迥異於石墨烯之電學特性，由電化學實驗結果能看出，氧化石墨烯薄擁有極高的電荷傳遞阻抗，使電子不易於電極表面轉移，抑制化學反應之發生，對比於現行的防蝕塗料更具有價格上的優勢。另一方面，亦將氧化石墨烯親水之特性，應用於石英晶體微天平上，作為濕度感測器之研究。氧化程度較高之氧化石墨烯擁有大量羥基，容易與水分子產生氫鍵結合，提高表面能，能大量捕獲空氣中的水分子，與石英晶體其穩定的諧振頻率結合，作為氧化石墨烯濕度感測器，並以計頻器及阻抗頻譜佐證氧化石墨烯對濕度感測器之靈敏度提升效果。

關鍵字

氧化石墨烯；溫度控制；乾燥方式；防腐蝕；濕度感測器

並列摘要

Graphene oxide (GO) prepared from various modified Hummers method was used as anti-corrosion barrier and humidity sensor. In this study, different manufacturing process and drying method was compared to different material properties. The surface morphology, crystallinity, dispersibility, defect degrees and functional group were observed by using scanning electron microscopy, X-ray diffraction, zeta potential analyzer, RAMAN and FT-IR spectra. The result of material properties showed the oxidation degree difference from manufacture process. Graphene oxide was then deposited on stainless steel substrate by electrophoretic deposition. The graphene oxide film served as a anti-corrosion barrier layer, protecting steel from corrosion media. The high charge transfer impedance of graphene oxide inhibited the occurrence of chemical corrosive reactions. Graphene oxide also had the competitive low price compared to those existing anti-corrosion coating. On the other hand, this study used graphene oxide and quartz crystal microbalance as humidity sensor. Graphene oxide with higher oxidation degrees was full of hydroxyl. It helped capture lots of water molecules that enhance the sensitivity of humidity sensor. The result would be proved by using frequency counter and impedance spectroscopy.

並列關鍵字

graphene oxide ； temperature control ； drying method ； anti-corrosion ； humidity sensor

參考文獻

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[2] S. E. M. Ardakani, B. S. M. Singh, and N. M. Mohammed, "Improving the quality of graphene oxide prepared by Hummer’s method by using centrifugation," Applied Physics Letters, vol. 1669, pp. 020027, 2015.

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氧化石墨烯製程改善:防蝕性能探討與濕度感測器之應用

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