本研究以烷基化聚乙烯亞胺，合成在親水主鏈上接不同親油基含量之親兩媒性高分子，並應用於在製備金屬奈米粒子，針對奈米粒子的分佈及形狀控制，還有金屬在奈米級的尺度時所展現的催化性質，作為兩大研究主題。本研究利用簡單且溫和的化學濕式法在水相中製備金屬奈米粒子，以烷基化聚乙烯亞胺形成親兩媒性高分子，利用紅外線光譜儀(FT-IR)、核磁共振光譜儀(NMR)、胺基滴定法鑑定所合成之高分子，並測量其在水溶液中的行為，包括表面張力、螢光強度(I1/I3)與動態粒徑分析。藉由聚乙烯亞胺及烷基化聚乙烯亞胺作為還原劑及保護劑，於還原四氯金酸前趨鹽的過程中利用UV-vis吸收光譜儀觀察還原前後吸收曲線的變化，TEM觀察金奈米粒子的之粒徑大小、分佈與形狀。結果顯示改變不同的條件，可以達到控制金奈米粒子分佈情形及形狀控制的目的，如球形奈米粒子的環狀分佈與金奈米平板。金奈米平板為一沿著(111)面成長之單晶結構，研究過程中觀察到聚乙烯亞胺烷基化程度與溶液的pH值都會影響金奈米平板的生成。藉由烷基化聚乙烯亞胺作為保護劑，NaBH4作為還原劑，製備白金與金的合金奈米粒子，使其覆載於碳黑上做為觸媒，探討不同熱處理時間及合金比例對觸媒效能的影響；PtxAuy/C觸媒經由電化學測試分析，隨著隨著PtAu合金中Au所佔比例的增加，越不易起始氧氣還原反應的發生，對甲醇氧化的活性則逐漸衰退；實際使用於DMFC單電池測試，結果顯示以PtxAuy/C做為陰極觸媒，雖然PtxAuy/C觸媒有抗甲醇反應的效果，但起始氧氣還原反應的能力降低造成電池效能不如以Pt/C作為陰極觸媒。

　In this study, the amphiphilic polymers synthesized by alkylated polyethylenimines with different amounts of alkyl-chain were used to prepare shape-controlled metal nanoparticles and to act as catalysts for DMFC. These amphiphilic polymers was characterized by 1H-NMR, and total amine values were estimated by potentiometric titration. The measurements of surface tension, the ratio of the fluorescence intensities of pyrene and dynamic light scattering for polymer solution were used to interpret their behaviors in water. Gold nanoparticles were prepared in the aqueous solution by utilizing HAuCl4 and alkylated polyethylenimines as a precursor and reducing agents, respectively. The polymer stabilized gold nanoparticles were characterized by UV-vis spectrophotometer and TEM. The results showed that ring-like gold nanoparticles and gold nanoplates can be prepared under different conditions. The gold particle shape not only can be easily tuned by varying the alkylation degree of PEI but also the reaction medium such as the solution pH value. Then the amphiphilic polymers were used as a stabilizer to prepare carbon-supported PtAu catalysts through the reduction of NaBH4. As compared to the Pt/C catalyst, the bimetallic alloy catalysts with different Pt/Au atomic ratio exhibited much higher methanol tolerance during the oxygen reduction reaction (ORR) in methanol-containing H2SO4 solution. However, the PtAu/C catalysts showed more negative onset potential for ORR in H2SO4 solution than Pt/C. The Pt/C and PtAu/C catalysts were employed for cathode in direct methanol fuel cell test, PtAu/C showed worse cell performance than Pt/C, logically attributed to its lower ORR reactivity.

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