pH-Dependent Adsorption of Gold Nanoparticles on p -Aminothiophenol-Modified Gold Substrates
1999; American Chemical Society; Volume: 15; Issue: 16 Linguagem: Inglês
10.1021/la990081g
ISSN1520-5827
AutoresTao Zhu, Xiaoyi Fu, Tao Mu, Jian Wang, Zhongfan Liu,
Tópico(s)Quantum Dots Synthesis And Properties
ResumoColloidal Au nanoparticles were assembled on a gold substrate via a p-aminothiophenol coupling layer. The surface coverage of Au nanoparticles was found to be closely related to the pH value of gold colloids. In alkaline solution, where the amino group was not protonated, Au nanoparticles could not be adsorbed on the substrate, while, under acidic conditions, protonation makes the amino group positively charged and the adsorption becomes easier. The interaction between Au colloids and the substrate is believed to be electrostatic.
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