- 學位論文
聚苯胺/銀奈米複合材料之製備與特性分析
Fabrication and characterization of polyaniline/silver nanocomposites
摘要
本文利用化學氧化聚合合成法製備聚苯胺/銀 (Polyaniline/Ag) 奈米複合材料。在固定硫酸濃度 0.2 M，苯胺 (aniline) 單體 0.1 莫耳與過硫酸銨 (Ammonium persulfate, APS) 氧化劑 0.02 莫耳的條件下，藉由改變硝酸銀 (Silver nitrate, AgNO3) 的添加量 (1.8, 3.5, 7.0 毫莫耳)，來得到一系列不同的聚苯胺/銀奈米複合材料樣品。透過掃描式電子顯微鏡 (Scanning electron microscope, SEM)，X-ray 繞射 (X-ray diffraction, XRD)，紫外光-可見光光譜分析 (UV-Vis) 與傅立葉紅外光譜分析 (FTIR)，與變溫之暗電導率量測來探討樣品的表面形貌，結晶性，及光吸收與導電特性。藉由觀察在添加不同重量的硝酸銀之合成條件下所生成的樣品，其奈米銀顆粒密度與粒徑分佈來了解奈米銀在聚苯胺/銀奈米複合材料所扮演的角色，也進一步探討聚苯胺/銀的導電機制。利用三明治與van der Pauw 此兩種不同的電導率量測方法來探討平行於聚苯胺鏈上的載子傳輸與垂直於鏈的載子傳輸機制。
並列摘要
In this study, we prepared the polyaniline/Ag nanocomposites by the chemical oxidation polymerization. We can get a series of different polyaniline/Ag powders by changing the adding amount of silver nitrate (1.8, 3.5, 7.0 mmol) and fixing the concentration of sulfuric acid (0.2 M), aniline (0.1 mol) and Ammonium persulfate (0.02 mol). By using scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis, FTIR and T-dependence of dark electrical conductivity σ(T), we found out the morphology, crystallization, Optical-absorption and mechanism of conductivity. Moreover, by discovering the different amount of silver nitrate in these powders, we found out the role of these polyaniline/Ag nanocomposites by the density of nano-Ag particles and the distribution of particle size; and further, studied more details about the mechanism of conductivity of polyaniline/Ag nanocomposites. And I used sandwich and van der Pauw which are two different method of conductivity measurement to discuss the carrier transmission of parallel and vertical in polyaniline chain.