摘要
本篇論文的研究主要分成兩個部分，第一部分是金奈米粒子的合成與粒徑的控制。利用硫氰化鈉將前驅物四氯金酸還原成金奈米粒子，並利用鍵結在還原金奈米粒子上的硫氰陰離子，使金奈米粒子因帶負電而互相排斥，懸浮在溶液中。金奈米粒子的尺寸最小可控制在4 nm。另外，利用檸檬酸鈉當作還原劑和保護基，進行還原及金奈米粒子的製備，而奈米粒子的尺寸可控制在16~17 nm之間。 研究的第二部分是採用一鍋反應法，合成金-二氧化鈦核-殼奈米粒子，利用維他命C和檸檬酸鈉還原四氯金酸，再將二氧化鈦的前驅物四氟化鈦加入其中，並加以水熱，經過不同條件的測試，可成功製備出兩種形貌的二氧化鈦包覆金奈米粒子並應用於染料敏化太陽能電池。
並列摘要
This thesis included two parts. In the first part, we synthesized the gold nanoparticles (Au-NP) by reducing of hydrogen tetrachloroaurate (HAuCl4) by sodium thiocyanate (NaSCN) and sodium citrate (Na3-citrate). The thiocyanate ions adsorbed on Au-NP form self-assembled monolayers on Au-NP to make dispersion of Au-NP in the solution.. The size of Au-NP was as small as 4 nm. Using Na3-citrate as reducing and stabilizing reagent, the diameter of the Au-NP is about 16 to 17 nm. The second part of the thesis is to apply a one-pot hydrothermal reaction to synthesize the Au-TiO2 core-shell nanoparticles (Au@TiO2) using titanium tetrafluoride as TiO2 precursors and HAuCl4 as Au precursor and ascorbic acid/Na3-citrate mixture as reducing agent. Two different morphology of Au@TiO2 nanostructures were obtained after 48 h hydrothermal reaction at 180 °C . The preliminary trial of Au@TiO2 in dye-sensitized solar cells was performed.