Measuring surface charge density and particle height using surface plasmon resonance technique

Analytical Chemistry
Xiaonan ShanNongjian Tao

Abstract

We demonstrate a method to measure surface charge density and particle height using surface plasmon resonance (SPR) detection. It is based on two facts: (1) The equilibrium height of a charged particle over a charged surface depends on the electrostatic interaction between the particle and the surface; and (2) SPR is extremely sensitive to the height of the particle. We perform numerical simulations to establish the relations between the SPR signal and the particle height, and between the particle height and the surface charge density, and carry out systematic experiments, including effects of different buffer concentrations, particle sizes, and concentrations, to examine the relations. The simulation and experimental results are in good agreement with each other. Using the method, we determine surface charge density of gold surface functionalized with different molecules. If the surface charge density is known, the method can also be used to determine the charges of the particles.

References

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Citations

Mar 28, 2012·Analytical and Bioanalytical Chemistry·Sabina Rebe RazStefan Weigel
Aug 28, 2012·Nature Nanotechnology·Xiaonan ShanNongjian Tao
Jan 5, 2011·Applied Physics Letters·Xiaonan ShanNongjian Tao
Sep 24, 2016·Accounts of Chemical Research·Yimin FangN J Tao
Dec 1, 2015·Scientific Reports·M RahimiF Rezaee
Apr 26, 2012·Angewandte Chemie·Chuanbo GaoYadong Yin
Feb 28, 2014·Angewandte Chemie·Steven E F KleijnPatrick R Unwin
Feb 8, 2019·Angewandte Chemie·Chen QianXian-Wei Liu
Nov 18, 2020·Nature Communications·Nareg OhannesianWei-Chuan Shih
Oct 17, 2020·Proceedings of the National Academy of Sciences of the United States of America·Yi-Nan LiuXian-Wei Liu
Apr 9, 2010·Analytical Chemistry·Li-Chen SuChien Chou
Jun 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Yi WangHui Wang
Jun 20, 2014·Nano Letters·Xiaonan ShanNongjian Tao
Sep 5, 2014·Analytical Chemistry·Hui YuNongjian Tao
Sep 17, 2019·Journal of the American Chemical Society·Hui WangNongjian Tao
Jan 10, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Marco Frasconi, Franco Mazzei
Jul 3, 2013·Analytical Chemistry·Christopher MacGriffNongjian Tao
Mar 29, 2020·Analytical Chemistry·Hao ZhuNongjian Tao

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