頁籤選單縮合
題名 | Analysis of Dynamic and Thermodynamic Adsorption of Nanoparticles on Solid Surfaces by Dark-field Light Scattering Measurements |
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作者 | 胡焯淳; 林家慶; 曾韋龍; 黃銘峯; 邱泰嘉; 張煥宗; | 書刊名 | Journal of the Chinese Chemical Society |
卷期 | 54:4 2007.08[民96.08] |
頁次 | 頁869-878 |
分類號 | 341 |
關鍵詞 | Dark-field microscope; Nanoparticles; Monolayer; Multilayer; Poly(diallyldimethylammonium); |
語文 | 英文(English) |
英文摘要 | We have constructed a dark-field light scattering microscope using a very low-cost digital camera to investigate the adsorption of gold nanoparticles (AuNPs) on four different substrates at various pH values. The substrates used are glass, polycarbonate (PC), poly (dimethylsiloxane) (PDMS), and poly (methylmethacrylate) (PMMA). The coverage of AuNPs on hydrophobic substrates such as PDMS is greater than that on hydrophilic substrates like glass. The adsorption and aggregation of AuNPs on a particular substrate increased upon decreasing the pH (from 9.0 to 4.0). A grater coverage percentage of AuNPs, but less aggregation, occurs on glass treated with poly(diallyldimethylammonium)(PDDA) than on bare glass. The scattering intensity increases upon increasing the number of layers of adsorbed AuNPs on glass that was treated sequentially with AuNPs and PDDA. When compared to UV-Vis absorption, dark-field microscope provides grater sensitivity and qualitative surface information. |
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