The Efficient Ionization Reaction of DTBA Achieved by Surface Plasmon Catalysis Effect
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The Efficient Ionization Reaction of DTBA Achieved by Surface Plasmon Catalysis Effect Yanqiu Yang 1 & Haoran Zhang 1 & Liping Ma 1 & Xuemei Lu 2 & Shiwei Wu 3 & Peng Song 2 & Lixin Xia 1,4 Received: 30 December 2019 / Accepted: 14 April 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract 4,4’-Dithiobisbenzoic acid (DTBA) is equivalent to two 4-mercaptobenzoic acid (pMBA) molecules connected together after losing H+, and this bimolecular mechanism of DTBA efficiently promotes the ionization reaction. Under the irradiation of laser light, DTBA molecules are broken to form bimolecules similar to pMBA, and this kind of bimolecular coupling greatly increases the probability of binding with Ag NPs. Also, this molecule has the carboxylic acid group, which leads to a certain sensitivity to pH. In this article, through the comparison of DTBA and pMBA parallel experiments, it is clear that DTBA has better Raman activity, higher reaction efficiency, and more stable reaction than pMBA. The occurrence of this highly efficient ionization reaction under the monitoring of surface-enhanced Raman spectroscopy (SERS) provides a certain value for the progress of further related reactions, and it also has a wide range of applications in pH sensors and intracellular pH monitoring. Keywords Surface-enhanced Raman spectroscopy . Surface plasmon-assisted catalytic reaction . Ionization reaction . pH monitoring
Introduction Surface-catalyzed chemical reactions [1–3] driven by surface plasmon have attracted wide attention in recent years. Among them, the surface plasmon can collect a large amount of electromagnetic energy through localized surface plasmon resonance (LSPR) and transform it into reaction molecules to overcome the energy barrier in the reaction to make the catalytic reaction proceed smoothly [4, 5]. When light is incident on nanoparticles made of precious metals, if the frequency of the incident photon matches its
* Peng Song [email protected] * Lixin Xia [email protected] 1
Department of Chemistry, Liaoning University, Shenyang 110036, People’s Republic of China
2
Department of Physics, Liaoning University, Shenyang 110036, People’s Republic of China
3
Experimental Center of Shenyang Normal University, Shenyang 110034, China
4
Yingkou Institute of Technology, Yingkou 115014, China
vibration frequency, the nanoparticle will strongly absorb the photon energy, and the LSPR phenomenon will occur. There is a large number of hot electrons that are generated by plasmon decay in the process, and a large amount of kinetic energy is provided to make some chemical reactions possible [6]. The holes that appear in pairs with electrons are used to complete a large number of oxidation reactions. Since 1974, Fleischmann and others adsorbed pyridine molecules on the roughened silver electrode surface and then carried out Raman spectroscopy [7]. For the first time, Raman spectra of single molecular layers of pyridine molecules were obtained. Van Duyne et al. through a large number of experiments an
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