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The effects of process parameters on hermetically carbon-coated optical fibers prepared by plasma enhanced chemical vapor deposition method
|關鍵字:||hermetically carbon-coated optical fibers|
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|摘要:||本文主要是以電漿輔助化學氣相沉積法製備碳密封鍍層光纖，研究不同的製程參數 (不同的射頻功率、工作壓力以及沉積溫度) 對於碳鍍層光纖性質的影響。結果顯示，當射頻功率小於200 W時，隨著射頻功率下降，碳氫活性物種的黏著係數下降並產生鬆散的碳鍍層結構。當射頻功率大於200 W時，隨著射頻功率上升結構中碳氫鍵角扭曲程度上升。而在射頻功率200 W時，碳鍍層有一最大的水接觸角。當工作壓力由0.12 torr增加至1.2 torr時，電漿中的氣體平均自由路徑變小，導致結構較為無序。當沉積溫度小於300°C時，隨著沉積溫度增加，熱能增加使碳鍍層結構有足夠能量重新組合，造成鍵角扭曲程度和缺陷量下降。當沉積溫度大於300°C時，碳鍍層結構轉變成石墨化現象。在沉積溫度300°C時，碳鍍層結構變成更緻密並擁有最大水接觸角90.1°。綜合水接觸角實驗以及低溫測試後表面形貌的結果發現，在射頻功率200 W、工作壓力0.12 torr以及沉積溫度300°C時所製備的碳鍍層擁有最佳的密封性質。|
In this experiment, the effects of process parameters on hermetically carbon-coated optical fibers prepared by plasma enhanced chemical vapor deposition method are investigated. The process parameters include the radio frequency power, the working pressure and the deposition temperature. First, the experimental results indicate that if the radio frequency power is below 200 W, the stacking coefficient of hydrocarbon radicals is small and the coating structure is loose. Nevertheless, if the radio frequency power is above 200 W, the degree of the hydrocarbon bond angle distortion in the structure increases as the radio frequency power increases. When the radio frequency power is 200 W, the water contact angle of carbon coating reaches the maximum value. Second, if the working pressure increases from 0.12 torr to 1.2 torr, the mean free path of hydrocarbon radicals decreases in the plasma. As a result, the carbon coating structure becomes more disorder as the working pressure increases. Third, if the deposition temperature is below 300C, the bonding defects and degree of bond angle distortion decrease with increasing the deposition temperature. This is because coating structure acquires enough thermal energy. If the deposition temperature is over 300C, the coating film shifts to the graphite-like structure. When the deposition temperature is 300C, the carbon coating has more dense structure and the water contact angle of carbon coating reaches a maximum value 90.1. According to the result of the water contact angle and the surface morphology after the low-temperature test, it is found that the carbon coating prepared at radio frequency power 200 W, working pressure 0.12 torr and deposition temperature 300C is the best one for used as the hermetic optical fiber coating.
|Appears in Collections:||材料科學與工程學系|
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