Directly Probing Molecular Ordering at the Buried Polymer/Metal Interface
Directly Probing Molecular Ordering at the Buried Polymer/Metal Interface
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DOI：
10.1021/ma901757w
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发表时间：
2009-10
期刊：
影响因子：
5.5
通讯作者：
Xiaolin Lu;Dawei Li;Cornelius B Kristalyn;Jianglong Han;N. Shephard;S. Rhodes;G. Xue;Zhan Chen
中科院分区：
文献类型：
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作者：
Xiaolin Lu;Dawei Li;Cornelius B Kristalyn;Jianglong Han;N. Shephard;S. Rhodes;G. Xue;Zhan Chen
我们开发了一种方法来直接探测在掩埋的聚合物/金属界面的分子有序。利用和频产生（SFG）振动光谱，我们观察到了在埋置的聚（丙烯酸甲酯）（PMA）/银（Ag）界面上酯甲基的有序化。为了直接探测PMA/Ag界面，我们从夹在熔融石英衬底和银表面之间的薄PMA膜收集SFG信号。结果发现，所观察到的SFG信号强度不依赖于PMA膜的厚度。通过计算不同PMA膜厚度的熔融石英/PMA和PMA/Ag界面的菲涅耳系数，表明SFG信号仅由PMA/Ag界面贡献。进一步的研究表明，PMA/Ag界面上的酯甲基基团向远离Ag表面的方向倾斜。
We developed a methodology to directly probe molecular ordering at the buried polymer/metal interface. Using sum frequency generation (SFG) vibrational spectroscopy, we observed ordering of ester methyl groups at the buried poly(methyl acrylate) (PMA)/silver (Ag) interface. In order to directly probe the PMA/Ag interface, we collected SFG signal from a thin PMA film sandwiched between a fused silica substrate and a silver surface. It was found that the observed SFG signal intensity does not depend on the PMA film thickness. According to the calculated Fresnel coefficients of the fused silica/PMA and PMA/Ag interfaces with PMA films of different thicknesses, it was shown that SFG signals are solely contributed by the PMA/Ag interface. Further studies indicated that the ester methyl groups at the PMA/Ag interface tilt away from the Ag surface.