本論文的目的是探討以微米/奈米分散技術製備石墨烯混成材料及其相關應用。結果討論將分成兩個部份探討，第四章主要是以設計及合成高分子型分散劑並控制石墨烯不同的分散程度及薄膜表面粗超度，將可製備出超疏水表面的薄膜；第五章為利用石墨烯混成材料製備染料敏化太陽能電池的對電極之應用研究。
第四章討論分散少層的還原後氧化石墨烯並且製備超疏水薄膜。還原後氧化石墨烯不同的含氧量(oxygen content)、分散溶劑為極性(polar)或非極性(non-polar)以及添加不同比例的星狀油溶性分散劑，對於還原後氧化石墨烯的分散性和疏水性都會有所影響。混合其它奈米尺度的材料，例如奈米碳管(Carbon Nanotubes，CNTs)和碳黑(Carbon Black，CB)，將可以提高薄膜表面的粗糙度，此結果可以仿造荷葉表面微米奈米結構的超疏水表面。最後，再添加聚甲基丙烯酸甲酯( Polymethylmethacrylate，PMMA )，提升微米奈米結構的機械性質。
第五章為選用實驗室中品質較好的rGO，利用rGO本身優異的導電性以及催化特性運用於染料敏化太陽能電池(Dye Sensitive Solar Cell，DSSC)中的對電極(Counter Electrode，CE)。對電極選擇滴落塗佈(drop coating)以及非燒結(non-annealing)低溫( 80 o C )除去溶劑的簡單製程。從結果顯示添加高分子型分散劑可以幫助高品質石墨烯的分散，並進一步混成奈米碳管以及碳黑，優化對電極製備出石墨烯/奈米碳管/碳黑複合電極，期望可以取代傳統昂貴的白金對電極材料。

Nano-manipulation is considered to be very important foundation research in nanotechnology. With the development of technology, the products have become the trend of miniaturization of materials that size from microns to nanometers. Therefore, the dispersion techniques urgently need to promote in order to approach the current demand. In this thesis, there are two parts describing the polymeric dispersants to achieve the nanohybrids of graphene platelets/-particle/-tubes nanomaterials or complexes will be prepared via the geometric shape in-homogeneity factor dispersing method and the corresponding functions including hydrophilic/hydrophobic dispersing properties. According to their functions, it could be searched possible applications, such as superhydrophobic surface and electrodes in dye-sensitized solar cells. The content of study is described as follow:
In this study, the first part we report the micro-/nano- manipulation of highly surface roughness by star-shaped highly hydrophobic polymeric dispersants finely stabilized the nanohybrids of carbon black (CB), carbon nanotubes (CNTs), and reduced graphene oxide (rGO). The star-shaped organic dispersant, namely a polyisobutylene-imide copolymer (PIB-imide), was synthesized via amidation and imidation reactions of polyisobutylene-g-succinic anhydride (PIB-SA) and poly(oxypropylene)-triamine (Jeffamine T403) of approximately 440 average molecular weight (Mw). The dispersion mechanism between the carbon materials and the PIB-imide through non-covalent interactions such as hydrophobic effect. Furthermore, the hybrid films exhibiting a highly water-droplet contact angle of 158o and the sliding angle of 2o. Adding PMMA enhance the mechanism of micro/nanostructure also exhibiting a highly water-droplet CA of 152o and SA of 3o. The organic/inorganic nanohybrids are proven to be a convenient method for mimicking Lotus leaf surfaces and potential useful for manufacturing superhydrophobic coating.
The second part choosing of reduced-grapheme oxide. Graphene has excellent electrical conductivity and catalytic properties. Adding an organic dispersant to help graphene dispersed and fabrication grapheme-carbon nanotubes and grapheme-carbon black composite electrode optimization of counter electrodes replace expensive platinum electrodes in dye-sensitized solar cells.

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