- 學位論文
奈米複合材料PANI/Au之電性分析
Electrical Characteristics of PANI/Au Nanocomposites
摘要
摘要 在本研究中，是討論導電高分子和奈米金粒子兩種不同的材料混合形成複合材料，所使用的導電高分子為聚苯胺(PANI)，會分為有摻雜質子酸和未摻雜質子酸的兩種PANI，將這兩種不同的PANI與粒徑大小為20 nm的奈米金膠體溶液均勻混合後，烘乾壓製成圓锭來進行電性量測。 首先利用紫外光-可見光吸收光譜儀(UV-Vis)和掃描式電子顯微鏡(SEM)來確認奈米金的濃度和顆粒大小；再把PANI粉末放入熱重分析儀(TGA)以裂解溫度來檢測其物質組成的情況，同時利用原子力顯微鏡(AFM)來檢查不同熱退火下PANI粉末形貌上的改變。 最後將兩種不同性質的複合材料藉由調控奈米金粒子的數量來進行電性分析，實驗上主要使用四點量測和阻抗分析儀（LCR）來做討論。先測量直流電導率並分析其結果;而另一方面，在交流量測上使用不同頻率，針對下列五個參數: (1)電導率(2)有效介電常數實部(3) 有效介電常數虛部(4)電容值(5)介電損失，討論其差異性並比較兩種複合材料的表現。
並列摘要
Abstract This study aims to the electrical properties of the composite material mixed by Polyaniline (PANI) and gold nanoparticles. We used two kinds of PANI which were doped or dedoped with proton acid. These two different PANI samples were mixed with gold nanoparticles of which particle size is about 20 nm. After mixed uniformly in liquid phase, the samples were dried and pressed into pellets for electrical analysis. The concentration of gold nanoparticles and their particle size were confirmed by ultraviolet–visible absorption spectroscopy (UV-Vis) and scanning electron microscope (SEM). The composition of PANI power was analyzed by thermal gravimetric analyzer (TGA). Atomic force microscopy (AFM) was used to check the morphology of the samples annealed at different temperatures. Finally, two different types of composite materials including different amount of gold nanoparticles were proceeded to electrical analysis. The four-point measurement and impedance analyzer (LCR) were used in the analysis. The difference of their DC conductivity was measured and discussed. On the other hand, the AC measurement at different frequencies was proceeded to get the following five parameters: (1) AC conductivity (2) the real part of the effective relative complex permittivity (3) the imaginary part of the effective relative complex permittivity (4) capacitance (5) dielectric loss. The performance differences of the two composites were compared and discussed.