Role of Adsorption Orientation in Surface Plasmon-Driven Coupling Reactions Studied by Tip-Enhanced Raman Spectroscopy
| Autor: | Bin Ren, Jun Cheng, Hai-Sheng Su, Shu Hu, Juan-Juan Sun, Teng-Xiang Huang, Hui-Li Yue, Sheng-Chao Huang, Matthew M. Sartin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Surface plasmon 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Tip-enhanced Raman spectroscopy Photochemistry 01 natural sciences Coupling reaction 0104 chemical sciences Adsorption Photocatalysis General Materials Science Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Physical Chemistry Letters. 10:2306-2312 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.9b00203 |
| Popis: | In the field of surface plasmon-mediated photocatalysis, the coupling reactions of p-aminothiophenol (PATP) and p-nitrothiophenol (PNTP) to produce p, p'-dimercaptoazobenzene (DMAB) are the most widely investigated systems. However, a clear understanding of the structure-function relationship is still required. Here, we used tip-enhanced Raman spectroscopy (TERS) to study the coupling reactions of PATP and PNTP on well-defined Ag(111) and Au(111) surfaces using 632.8 and 532 nm lasers. On Au(111), the oxidative coupling of PATP can proceed under irradiation by a 632.8 nm laser, and the reductive coupling of PNTP can only occur under irradiation by a 532 nm laser. Neither wavelength of laser light can induce the coupling reactions of these two molecules on Ag(111). Density functional theory (DFT) was used to calculate the stable adsorption configurations of PATP and PNTP on Ag(111) and Au(111). Both the adsorption configurations of the two molecules on the surfaces and laser energies were, experimentally and theoretically, found to determine whether the coupling reactions can occur on different substrates. These results may help the rational design of photocatalysts with enhanced reactivity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|