Directly Probing Molecular Ordering at the Buried Polymer/Metal Interface 2: Using P-Polarized Input Beams

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• 作者：Xiaolin Lu ; Gi Xue ; Xinping Wang ; Jianglong Han ; Xiaofeng Han ; Jeanne Hankett ; Dawei Li ; Zhan Chen
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：August 14, 2012
• 年：2012
• 卷：45
• 期：15
• 页码：6087-6094
• 全文大小：429K
• 年卷期：v.45,no.15(August 14, 2012)
• ISSN：1520-5835

文摘

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.