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標題: | 摻雜氧化石墨烯於聚偏二氟乙烯之焦電特性探討 Study on the influence of graphene-oxdie doping in the pyroelectricity of Poly(vinylidene fluoride) |
作者: | Cheng-Tao Ho 何政道 |
指導教授: | 張培仁 |
關鍵字: | 聚偏二氟乙烯,PVDF,氧化石墨烯,焦電,軟性, PVDF,Graphene oxide,Pyroelectricity,Flexible, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 本文中利用焦電材料聚偏二氟乙烯Poly(vinylidene fluoride) (PVDF)為研究主體,並探討參雜不同重量百分比的氧化石墨烯(Graphene Oxide)於PVDF中對焦電性質之改良,目的為改善全透明軟性紅外線感測器之焦電響應。
過程中主要利用旋轉塗佈(Spin Coating)的方式來成膜,此方法的優點在於便宜、製成速度快,其缺點為薄膜多孔性。實驗中探討不同重量百分比濃度的PVDF對殘留極化率的影響。成膜後利用不同的退火溫度來探討結晶性質受溫度之影響,並利用XRD、FTIR來分析其最佳結晶溫度,後續對薄膜極化以改善其焦電性。找到最佳的結晶退火溫度及PVDF濃度後,利用摻雜不同重量百分比的氧化石墨烯來分別探討焦電性質的影響。 氧化石墨烯分散於PVDF中的均勻度好壞會影響到焦電響應,所以摻雜過程中使用超音波震盪來提升摻雜的均勻度,之後由掃描式電子顯微鏡(SEM)觀察下可發現分散情況良好。從XRD和FTIR檢測中發現,摻雜氧化石墨烯於PVDF有助於提升焦電性質,其中又以摻雜量為1wt%為最佳,於高摻雜量的情況下會造成漏電情況嚴重、脫膜現象產生、焦電響應下降,如摻雜1wt%氧化石墨烯的PVDF焦電流大小為摻雜量2wt%的3倍,比無摻雜氧化石墨烯的PVDF大 10倍。 In this study, we use pyroelectric material Poly(vinylidene fluoride)(PVDF) as research themes to produce transparent and flexible infrared thermal sensor. Then doping with different weight percentages of graphene oxide (GO) in PVDF to improve it’s pyroelectric properties. The whole process to produce PVDF pyroelectric film is used by spin coating method. The advantages of this method are low cost and fast manufacture, but the main disadvantage is porosity of film. In experiment, I investigate the change of the polarization by different weight concentration of PVDF. Use XRD and FTIR to analyze the effect of different annealing temperatures on PVDF β- phase. After find out the best parameters of annealing temperature and PVDF concentration, doping different contents of graphene oxide into PVDF. The uniformity of graphene oxide dispersed in PVDF will affect the pyroelectric response, so the dispersion process using ultrasonic vibration to enhance the uniformity of dispersion. Followed by the scanning electron microscope (SEM) observation can be found in well dispersion. From the XRD and FTIR results found that disperse graphene oxide into PVDF can improve the pyroelectric characteristic and the ideal amount is 1 wt%. High dispersion amount will cause leakage, parting and low pyroelectric response. For instance, the signal experiment find that the quantity of pyroelectric current with graphene oxide doping amount 1wt% is three times larger than doping amount 2wt% and ten times larger than PVDF without doping. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60452 |
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顯示於系所單位: | 應用力學研究所 |
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