Theoretical consideration on preparing silver particle films by adsorbing nanoparticles from bulk colloids to an air-water interface

Langmuir : the ACS Journal of Surfaces and Colloids
Jiawen HuZhong-Qun Tian

Abstract

In our previous paper, a method for preparing enormous surface-enhanced Raman scattering (SERS) active substrates through the aggregation of silver particles trapped at an air-water interface was reported. Here, further efforts were devoted to investigate the origin of assembling silver particle films by adsorbing nanoparticles from bulk colloids to the air-water interface. It was revealed that it is thermodynamically favorable for a colloidal particle in bulk colloids to adsorb to the air-water interface; however, a finite sorption barrier between it and the nearby particles usually restrains the adsorption process. When an electrolyte such as KCl, which is commonly used as an activating agent for additional SERS enhancement, was added into silver colloids, it largely reduced the sorption barrier. Thus, silver nanoparticles can break through the sorption barrier, pop up, and be trapped at the air-water interface. The trapped silver particles are more inclined to aggregate at the interface than those in bulk colloids due to the increase of van der Waals forces and the reduction of electrostatic forces. The morphology of the as-prepared silver particle films was characterized by scanning electron microscope, and their SERS activ...Continue Reading

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Citations

Sep 1, 2006·The Journal of Chemical Physics·Yuling WangErkang Wang
May 4, 2011·Journal of Colloid and Interface Science·Yu-Rong ZhangZe-Lin Li
Apr 2, 2015·The Science of the Total Environment·Samuel K KumahorHans-Jörg Vogel
Jan 2, 2007·Advances in Colloid and Interface Science·R MillerM Michel
Jul 22, 2005·Angewandte Chemie·Wolfgang H Binder
Aug 5, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Navid Bizmark, Marios A Ioannidis
Oct 15, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Patrick DegenHeinz Rehage
Nov 16, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Pascal BertschPeter Fischer
Aug 26, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Shuman Li, Hong-Guo Liu

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