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Charge Transfer on the Surface-Enhanced Raman Scattering of Ag/4-MBA/PEDOT:PSS System: Intermolecular Hydrogen Bonding
| Content Provider | MDPI |
|---|---|
| Author | Pan, Yuenan Wang, Wei Guo, Shuang Jin, Sila Park, Eungyeong Sun, Yantao Chen, Lei Jung, Young |
| Copyright Year | 2021 |
| Description | 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 $b_{2}$ vibration mode was significantly enhanced due to the influence of the charge transfer (CT) mechanism. The CT degree $(ρ_{CT}$) 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 $ρ_{CT}$ reached a maximum. Compared with that of the undoped PEDOT:PSS system, $ρ_{CT}$ 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. |
| Starting Page | 111 |
| e-ISSN | 22279040 |
| DOI | 10.3390/chemosensors9050111 |
| Journal | Chemosensors |
| Issue Number | 5 |
| Volume Number | 9 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-05-17 |
| Access Restriction | Open |
| Subject Keyword | Chemosensors Spectroscopy Surface-enhanced Raman Scattering (sers) Charge Transfer (ct) Intermolecular Hydrogen Bonding Organic Semiconductors |
| Content Type | Text |
| Resource Type | Article |
