Combinatorial near-edge x-ray absorption fine structure: Simultaneous determination of molecular orientation and bond concentration on chemically heterogeneous surfaces
Combinatorial near-edge x-ray absorption fine structure: Simultaneous determination of molecular orientation and bond concentration on chemically heterogeneous surfaces
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DOI：
10.1063/1.1535271
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发表时间：
2003-01-13
影响因子：
4
通讯作者：
Efimenko, K
中科院分区：
文献类型：
--
作者：
Genzer, J;Fischer, DA;Efimenko, K
我们发现，结合近边x射线吸收精细结构（NEXAFS）光谱和入射x射线在样品上的光栅化，可以同时获得平面化学非均匀表面的分子取向和键化学。该光栅产生空间和能量的连续二维NEXAFS图像，揭示了有关化学（包括键浓度）和表面结合分子的方向的信息，具有亚毫米平面空间分辨率和亚单层分子灵敏度。我们通过同时探测平面二氧化硅衬底上双SF分子梯度中的半氟化（SF）分子的浓度和分子取向，说明了组合NEXAFS方法的力量。(C) 2003年美国物理研究所。
We show that simultaneous molecular orientation and bond chemistry of planar chemically heterogeneous surfaces can be obtained by combining near-edge x-ray absorption fine structure (NEXAFS) spectroscopy and rastering the incident x-ray beam on the specimen. This rastering produces serially two-dimensional NEXAFS images in space and energy, revealing information about the chemistry (including bond concentration) and orientation of the surface-bound molecules with submillimeter planar spatial resolution and submonolayer molecular sensitivity. We illustrate the power of the combinatorial NEXAFS method by simultaneously probing the concentration and molecular orientation of semifluorinated (SF) molecules in double-SF molecular gradients on flat silica substrates. (C) 2003 American Institute of Physics.