本研究中於室溫下水相中合成硒化鎘奈米粒子並使用聚乙烯胺（PVAm）高分子為穩定劑。在這實驗中使用離子沉澱法合成奈米粒子，使用鎘鹽為氯化鎘，而使用硒元素前驅物為硒化氫（H2Se）氣體及其鹼鹽硒氫化鈉（NaHSe），所以利用兩種不同方式添加硒化物於Cd2+-PVAm溶液中合成硒化鎘奈米粒子。在PVAm溶液中，藉由控制溶液酸鹼值以調控高分子鏈上電荷密度，進而改變高分子鏈於溶液中的型態，也藉由改變溶劑比例進而改變高分子鏈之型態。藉由調整酸鹼值及共溶劑可以改變PVAm高分子對於CdSe奈米粒子生成時的氨基的穩定作用及高分子鏈間的生長空間，進而操控所生成奈米粒子其粒徑。並以兩種不同方式添加硒化物於反應溶液，在添加硒氫化鈉採取快速注入方式，而使用硒化氫氣體則採取藉由氮氣緩慢帶入反應溶液，由此改變粒子生長時反應濃度條件，發現使用硒化氫合成可以得到表面缺陷較少且放光強度較高的硒化鎘奈米粒子。由於新鮮製備的硒化鎘奈米粒子具有較弱放光強度，所以採取光活化作用以增強其放光強度，比較兩種不同添加方式所合成硒化鎘奈米粒子經光活化結果，並推論PVAm型態會影響光活化之速率及程度。

In this study, the CdSe nanoparticles (NPs) were synthesized using poly(vinylamine) (PVAm) as the stabilizer in aqueous phase at room temperature. The procedures for the synthesis involve transformation of Se precursors, H2Se or NaHSe, to produce CdSe NPs in the stock solution, which contains Cd2+-PVAm. The size of CdSe NPs could be controlled by varying the pH of the solution and the ratio of the methanol and water co-solvent in the Cd2+-PVAm stock solution. The change of the size of CdSe NPs due to different pH values and the co-solvent is attributed to the variation of the chelating ability of the amine groups and the conformation of the polymer chain. In this study, the methods of adding the Se precursor were to first inject the NaHSe solution to the Cd2+-PVAm solution and to purge slowly the H2Se gass to the solution, that control the concentration of the Se2- for the growth of the CdSe NPs. The CdSe NPs prepared by purging H2Se shows stronger PL intensity, that means the surface defeats were less. Although the pre-prepared CdSe NPs shows weak PL intensity, the photoactivation can enhance the intensity of the PL emission up many times. Compared the results of the CdSe NPs after the photoactivation, the comformation of the PVAm influenced the degree of the photoactivcation.

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