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Sensors 2017, 17(3), 530; doi:10.3390/s17030530

Real-Time Sensing of O-Phenylenediamine Oxidation on Gold Nanoparticles

1
Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry & School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
2
College of Chemistry and Chemical Engineering, Qiqihar University, 42 Culture Road, Qiqihar 161006, China
*
Author to whom correspondence should be addressed.
Academic Editor: Huangxian Ju
Received: 14 December 2016 / Revised: 20 February 2017 / Accepted: 21 February 2017 / Published: 7 March 2017
(This article belongs to the Special Issue Nanobiosensing for Sensors)
View Full-Text   |   Download PDF [1889 KB, uploaded 7 March 2017]   |  

Abstract

Real-time monitoring of chemical reactions is still challenging as well as important to study reaction mechanisms and reaction kinetics. Herein, we demonstrated the real-time monitoring of o-phenylenediamine (OPD) oxidation on the surface of gold nanoparticles by surface-enhanced Raman spectroscopy (SERS). The oxidation mechanism and the reaction kinetics were investigated on the basis of the SERS spectrum variation and the related density functionalized theory calculation. It was shown that the oxidation of OPD in the presence of copper ions was a two-step process of the deprotonation of the amino group on the aromatic rings and the rearrangement of the electron cloud to a π-conjugated system, which may open a new door to comprehensively understand the reaction process. View Full-Text
Keywords: surface-enhanced Raman spectroscopy; oxidation of o-phenylenediamine; real-time monitoring surface-enhanced Raman spectroscopy; oxidation of o-phenylenediamine; real-time monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, R.-J.; Sun, J.-J.; Song, H.; Tian, J.-Z.; Li, D.-W.; Long, Y.-T. Real-Time Sensing of O-Phenylenediamine Oxidation on Gold Nanoparticles. Sensors 2017, 17, 530.

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