Abstract
The charge-transfer resonance of Raman measurements in nanosized semiconductor-molecule-metal interfaces as a function of the excitation energy with four models (Cu-ZnO-PATP-Ag, Cu-Ag-PATP-ZnO, Cu-ZnO-Ag-PATP, and Cu-Ag-ZnO-PATP assemblies) to describe this dependence provides a powerful tool to study the chemical mechanism of surface enhanced Raman scattering (SERS). We measured the SERS spectra of self-assembled p-aminothiophenol (PATP) molecule junctions at 488, 514, 633, and 785 nm excitation wavelengths. We followed changes at the molecule junctions during the conditioning and eventually effect of charge-transfer (CT) through molecule-ZnO interfaces. Our results demonstrate that the interaction between the semiconductor bands and molecular energy levels can lead to novel charge behavior. The typical ZnO-PATP interfacial electron-hole recombination causes an increase in the CT resonance enhancement of Raman scattering, which is mainly responsible for the drastic change in molecular polarizability. We also proposed a complementary interpretation of the mechanism responsible for the highly variable enhancement observed in SERS. © 2012 American Chemical Society.
| Original language | English |
|---|---|
| Pages (from-to) | 14701-14710 |
| Journal | Journal of Physical Chemistry C |
| Volume | 116 |
| Issue number | 27 |
| DOIs | |
| Publication status | Published - 12 Jul 2012 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to <a href="mailto:[email protected]">[email protected]</a>.Funding
The Research was supported by the National Natural Science Foundation (Grants 20921003, 20903044, and 20973074) of People' Republic of China; Specialized Research Fund for the Doctoral Program of Higher Education (20110061110017), the 111 project (B06009), and the Development Program of the Science and Technology of Jilin Province (20110338). This project was also supported by Award No. 2006-DN-BX-K034 awarded by the National Institute of Justice, Office of Justice Programs, U.S. Department of Justice. The opinions, findings, and conclusions or recommendations expressed in this publication/program/exhibition are those of the author(s) and do not necessarily reflect those of the Department of Justice.