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Article

Charge Transfer on the Surface-Enhanced Raman Scattering of Ag/4-MBA/PEDOT:PSS System: Intermolecular Hydrogen Bonding

1
College of Chemistry, Jilin Normal University, Siping 136000, China
2
Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 24341, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Marco Pisco
Chemosensors 2021, 9(5), 111; https://doi.org/10.3390/chemosensors9050111
Received: 14 April 2021 / Revised: 14 May 2021 / Accepted: 14 May 2021 / Published: 17 May 2021
(This article belongs to the Section Optical Chemical Sensors)
A sandwich-structured noble metal-probe molecule-organic semiconductor consisting of Ag nanoparticles (NPs), 4-mercaptobenzoic acid (4-MBA) and different concentrations of poly(styrenesulfonate:poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) was prepared by layer-by-layer assembly. Intermolecular hydrogen bonding was observed to have a significant effect on the surface-enhanced Raman scattering (SERS) of Ag/4-MBA/PEDOT:PSS. Upon increasing the PEDOT:PSS concentration, the characteristic Raman band intensity of 4-MBA was enhanced. In addition, the selected b2 vibration mode was significantly enhanced due to the influence of the charge transfer (CT) mechanism. The CT degree (ρCT) of the composite system was calculated before and after doping with PEDOT:PSS; when the concentration of PEDOT:PSS was 0.8%, the SERS intensity tended to be stable, and ρCT reached a maximum. Compared with that of the undoped PEDOT:PSS system, ρCT was significantly enhanced after doping, which can be explained by the CT effect induced by hydrogen bonds. These results indicate that hydrogen bonding transfers a charge from the Fermi energy level of Ag to the lowest unoccupied molecular orbital (LUMO) of 4-MBA, and due to the resulting potential difference, the charge will continue to transfer to the LUMO of PEDOT:PSS. Therefore, the introduction of organic semiconductors into the field of SERS not only expands the SERS substrate scope, but also provides a new idea for exploring the SERS mechanism. In addition, the introduction of hydrogen bonds has become an important guide for the study of CT and the structure of composite systems. View Full-Text
Keywords: surface-enhanced Raman scattering (SERS); charge transfer (CT); intermolecular hydrogen bonding; organic semiconductors surface-enhanced Raman scattering (SERS); charge transfer (CT); intermolecular hydrogen bonding; organic semiconductors
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MDPI and ACS Style

Pan, Y.; Wang, W.; Guo, S.; Jin, S.; Park, E.; Sun, Y.; Chen, L.; Jung, Y.M. Charge Transfer on the Surface-Enhanced Raman Scattering of Ag/4-MBA/PEDOT:PSS System: Intermolecular Hydrogen Bonding. Chemosensors 2021, 9, 111. https://doi.org/10.3390/chemosensors9050111

AMA Style

Pan Y, Wang W, Guo S, Jin S, Park E, Sun Y, Chen L, Jung YM. Charge Transfer on the Surface-Enhanced Raman Scattering of Ag/4-MBA/PEDOT:PSS System: Intermolecular Hydrogen Bonding. Chemosensors. 2021; 9(5):111. https://doi.org/10.3390/chemosensors9050111

Chicago/Turabian Style

Pan, Yuenan, Wei Wang, Shuang Guo, Sila Jin, Eungyeong Park, Yantao Sun, Lei Chen, and Young Mee Jung. 2021. "Charge Transfer on the Surface-Enhanced Raman Scattering of Ag/4-MBA/PEDOT:PSS System: Intermolecular Hydrogen Bonding" Chemosensors 9, no. 5: 111. https://doi.org/10.3390/chemosensors9050111

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