Abstract
In this work, the effect of amino compounds on the catalytic property of gold nanoparticles (AuNPs) in the luminol-H2O2 chemiluminescence (CL) system was systematically investigated. The experimental results showed that the catalytic ability of AuNPs on luminol-H2O2 system can be changed after AuNPs interacted with the amino compounds. It was found that two main aspects influence the catalytic property of AuNPs: (1) the electron density in conduction bands of AuNPs and (2) the surface negative charge density of AuNPs. Some amino compounds can decrease the electron density in the conduction bands of AuNPs after they reacted with AuNPs, resulting in a decrease of the catalytic property of AuNPs on luminol-H2O2 system. However, some amino compounds can cause AuNPs to aggregate after they reacted with AuNPs. The surface negative charge density of AuNPs would decrease, and zeta potentials were tested to verify the change of the surface negative charge density of AuNPs. As a result, the catalytic property of AuNPs on luminol-H2O2 system increased, and an enhanced CL signal can be obtained after the amino compounds reacted with AuNPs. This work will help people understand the catalytic mechanism of AuNPs and establish the CL method for the determination of amino compounds.
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Effects of amino compound on luminol-H2O2-AuNPs CL system.
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Acknowledgments
We are thankful for the National Natural Science Foundation of China (No. 21005048) and Shaanxi Province Science Foundation (No. 2015JM2066) for funding this work. The authors also thank the Fundamental Research Funds for the Central Universities (No. GK201603049) and Program for Innovative Research Team in Shaanxi Province (No. 2014KCT-28) for supporting this work.
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Published in the topical collection Highlights of Analytical Chemical Luminescence with guest editors Aldo Roda, Hua Cui, and Chao Lu.
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Liu, W., Luo, J., Zhao, M. et al. Effect of amino compounds on luminol-H2O2-gold nanoparticle chemiluminescence system. Anal Bioanal Chem 408, 8821–8830 (2016). https://doi.org/10.1007/s00216-016-9792-5
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DOI: https://doi.org/10.1007/s00216-016-9792-5