Analysis of dynamic and thermodynamic adsorption of nanoparticles on solid surfaces by dark-field light scattering measurements

作者：Cho Chun Hu; Jia Ching Lin; Wei Lung Tseng^*; Ming Feng Huang; Tai Chia Chiu; Huan Tsung Chang

来源：Journal of the Chinese Chemical Society, 2007, 54(4): 869-878.

DOI：10.1002/jccs.200700126

• dark-field microscope
• nanoparticles
• monolayer
• multilayer
• poly(diallyldimethylammonium)

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(methyl methacrylate) (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 greater 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 greater sensitivity and qualitative surface information.

• 出版日期2007-8
• 单位中山大学