本研究是使用聚乙二胺樹枝狀聚合物(PAMAM)與聚乙二胺樹枝狀聚合物–奈米金粒，利用spin coating技術塗佈於石英晶體振盪微天平(QCM)晶片上，製備成低濕感測器。探討PAMAM的generation數目(generation 1(G1)及generation 5 (G5))、及奈米金修飾聚乙二胺樹枝狀聚合物等因素對低濕感應行為的探討。並利用原子力顯微鏡(AFM)來觀察薄膜的表面特性與成長情形。
實驗的結果可以發現到，G5的PAMAM的低濕感度較G1的PAMAM高，同時利用奈米金修飾G5-PAMAM更提高G5-PAMAM低濕感度。由AFM表面觀察及利用Langmuir isotherm adsorption可以證明薄膜的表面結構及聚乙二胺樹枝狀聚合物的表面官能基(-NH2)的數量及奈米金粒在低濕感測行為上扮演重要的角色。
Low-humidity sensing performance of generation 1 amine terminated polyamidoamine (PAMAM) dendrimer (G1-NH2), generation 5 amine terminated PAMAM dendrimer (G5-NH2) and G5-NH2–Au
nanoparticles (G5-NH2–AuNPs) thin films were investigated by using a quartz crystal microbalance (QCM). The formation of AuNPs was characterized by UV–vis spectrophotometer. The characterizations
of the thin films were analyzed by atomic force microscopy (AFM). Water vapor molecules adsorbed onto the G5-NH2–AuNPs thin film had a larger frequency shift than the G1-NH2 and G5-NH2 thin films.
Adsorption dynamic analysis, molecular mechanics calculation (association constant), was applied to elucidate how number of amine surface functional groups of PAMAM dendrimer and doped AuNPS in
PAMAM dendrimer increase the sensitivity to low-humidity.
