氮化碳是一種聚合物材料，因其半導體能帶結構和優異的物理化學穩定性質近年來被廣泛在光催化等領域。目前文獻研究大多以氮化碳粉末為主，而為了能更進一步探討其光電化學等應用，氮化碳薄膜的製備在近期開始獲得更多的關注。
本研究以溶液熱法成功製備氮化碳於FTO基板上。實驗中利用KOH/NaCl和LiCl/KCl作為複合劑進行形貌調控，透過XRD、FTIR、SEM和XPS進行材料結構與形貌的鑑定。
本文利用光降解亞甲基藍與羅丹明B來探討可見光下的光催化效能，並且另製備氮化碳與氧化還原石墨烯的複合材料進一步增強光催化效能。另外，透過光電化學分析可得知氮化碳薄膜在可見光下的光電流密度與光電轉換效率。再利用UV-vis和UPS量測可推斷得知能帶結構，其 Ec 和 Ev 橫跨氫氣、氧氣及超氧自由基的氧化還原電位，且用PL量測了解電子電洞對的再結合率。此外，本研究也利用螢光強度的變化來探討氮化碳薄膜對銅離子溶液的濃度偵測。

A polymeric semiconductor of carbon nitride (C3N4) has been regarded as a promising photocatalytic material because of its certain range of visible-light absorption, suitable band structure, and excellent stability. Most of the studies in the literature have been emphasized powder-based C3N4, which is not ideal for the applications of photodegradation, photoelectrochemical (PEC), and ion sensing measurements. The practical applications of C3N4 films and devices are still in the early stages of development due to challenging fabrication methods.
In this study, a low temperature solvothermal process was developed to synthesize various morphologies of C3N4 films on a fluorine-doped tin oxide (FTO) substrate. XRD, FTIR, and XPS were employed to analyze the structure and chemical composition of the C3N4 films. Furthermore, SEM was used to study the morphology variation.
Photocatalytic performance of various melon films and melon/ reduced graphene oxide (rGO) were investigated through photodegradation of Methylene Blue (MB) and Rhodamine B (RhB) and PEC reactions. The sample of melon with KOH/NaCl exhibited superior photodegradation and PEC performances under visible light illumination; however, no substantial performances were observed. The composite sample of melon/rGO exhibited substantially enhanced photodegradation and PEC activities. UV-vis and UPS results were used to deduce the band structures of melon films without any complex agents and with KOH/NaCl. The recombination of electron-hole pairs was also analyzed by PL. The energy band and PL results consistently interpreted the photodegradation and PEC reactions. Moreover, the feasibility of Cu2+ detection using melon films was also studied.

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