Directly Probing Molecular Ordering at the Buried Polymer/Metal Interface 2: Using P-Polarized Input Beams
作者：Xiaolin Lu*, Gi Xue, Xinping Wang, Jianglong Han, Xiaofeng Han, Jeanne Hankett, Dawei Li, Zhan Chen*
關(guān)鍵字：Buried polymer/metal inteface, SFG, p-polarized beam
論文來源：期刊
具體來源：Macromolecules 2012, 45, 6087-6094 ACS Editors’ Choice
發(fā)表時(shí)間：2012年
Previously, we developed several methods to use sum frequency generation (SFG) vibrational spectroscopy to probe buried polymer/metal interfaces in situ by depositing polymer films with different thicknesses on metal surfaces or sandwiching a polymer thin film between a metal surface and a fused silica window. In this study, we developed a new and easier method to directly probe the polymer/metal interface by collecting ppp SFG spectra using a poly(ethyl methacrylate) (PEMA)/silver (Ag) interface as an example. We confirmed that for a thin polymer film on metal, the dominant SFG signals were contributed from the polymer surface in air and/or the polymer metal interface, while the contribution from the polymer bulk could be ignored. Previously, we showed that the ssp spectra were contributed by both the polymer/air and polymer/metal interfaces. Here we demonstrated that the SFG ppp spectra were dominated by signals from the buried polymer/metal interface from which the structural information on the buried interface can be deduced. This method to probe the buried polymer/metal interface via SFG is relatively simple compared to our previous sample preparation techniques and/or data analysis methods.
http://pubs.acs.org/doi/abs/10.1021/ma301088g