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Citation: Fu Xiao-Yi, Mou Tao, Wang Jian, Zhu Tao, Liu Zhong-Fan. pH-Dependent Assembling of ld Nanoparticles on p-Aminothiophenol Modified ld Substrate[J]. Acta Physico-Chimica Sinica, ;1998, 14(11): 968-974. doi: 10.3866/PKU.WHXB19981103 shu

pH-Dependent Assembling of ld Nanoparticles on p-Aminothiophenol Modified ld Substrate

1.
Center for Intelligent Materials Research(CIMR),College of Chemistry Molecular Engineering,Peking University,Beijing 100871

Received Date: 20 January 1998
Available Online: 15 November 1998

Au nanoparticles are assembled on ld substrate modified with p-aminothiophenol. AFM measurements show that the coverage of Au nanoparticles is closely related to the pH value of colloids. The SERS intensity also changes with the pH value, which is well consistent with the pH-dependent change of the coverage. In alkaline solution, the amino group is not protonated, and Au particles can not be adsorbed on the substrate: while under acidic environment, protonation makes the amino group positively charged and the adsorption gets easier. The interaction between the particles and the substrate is considered to be electrostatic. The PH value, which controls the coverage of Au nanoparticles, affects both the protonation of the amino group and the quantity of the negative charge of Au particles.
- Au nanoparticles,
- Self-assembly,
- AFM,
- SERS
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