奈米碳管具有優異的導電特性、熱性質及機械性質,是一個具有良好潛力的奈米添加材料,而石墨烯為近年來所發現的新型奈米材料來自於石墨的剝層,但由於奈米碳管及石墨烯在高分子基材間的介面相容性不佳,易導致其團聚發揮其預期效果,因此在應用上必須對奈米碳管及石墨烯進行改質。本實驗是將奈米碳管及石墨烯利用不同分散劑來比較其分散效果,沒有用化學改質法分散的目的,是希望保留多壁奈米碳管優良的高長徑比(aspect ratio),首先將多壁奈米碳管與石墨烯兩者製成薄膜,之後利用溶液法將多壁奈米碳管混摻至聚丙烯中塗佈之,將其製成替代染料敏化太陽能電池的反電極。 本實驗使用熱重損失分析儀(TGA)及熱差分析儀(DSC)探討複材的熱穩定性質,多點探針高阻儀(megohmmeter)觀測複材的導電性,掃描式電子顯微鏡(SEM)及穿透式電子顯微鏡(TEM)進行表面分析。藉由奈米碳管的高長徑比可在聚丙烯基材中形成網狀分布的結構,有效的提升聚丙烯複合材料的導電度,進一步的提升其熱穩定性及機械性質。
Carbon Nanotubes (CNTs) with excellent electrical conductivity, mechanical and thermal properties can be potentially used as nano-reinforcements in polymer composite. Graphene (GP) is layers of exflorated graphite. The lack of interfacial interactions between CNTs and GP with polymer matrix causes their agglomeration; therefore, it is necessary to modify CNTs to enhance the compatibility within a polymer matrix. We dispersing CNTs and GP by physical dispersion, without chemical dispersion causes CNTs has high aspect ratio. First, prepared the CNTs and GP's film. Then we made solution of polypropylene (PP) with CNTs to coat on the beter electrical film, which could be them need as antielectrode on the dye solar cell. The thermal properties were analyzed by Thermogravimetric analysis (TGA) and Differential scanning calorimetry(DSC). The electrical conductivity properties of CNTs film and electrical substrate were obtained by multi-sensers Super Megohmmeter. We used Scanning electron microscope(SEM) and Transmission electron microscopy (TEM) to examine the morphology of materials. Due to the high aspect ratio of CNTs, the formation of a network structure between PP and physically modified MWNTs significantly improves electrical conductivity, thereby increasing its thermal and mechanical properties.
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