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Infrared vibrational nanocrystallography and nanoimaging

机译：红外振动纳米晶体学和纳米成像

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Molecular solids and polymers can form low-symmetry crystal structures that exhibit anisotropic electron and ion mobility in engineered devices or biological systems. The distribution of molecular orientation and disorder then controls the macroscopic material response, yet it is difficult to image with conventional techniques on the nanoscale. We demonstrated a new form of optical nanocrystallography that combines scattering-type scanning near-field optical microscopy with both optical antenna and tip-selective infrared vibrational spectroscopy. From the symmetry-selective probing of molecular bond orientation with nanometer spatial resolution, we determined crystalline phases and orientation in aggregates and films of the organic electronic material perylenetetracarboxylic dianhydride. Mapping disorder within and between individual nanoscale domains, the correlative hybrid imaging of nanoscale heterogeneity provides insight into defect formation and propagation during growth in functional molecular solids.
机译：分子固体和聚合物可以形成低对称性晶体结构，在工程设备或生物系统中表现出各向异性的电子和离子迁移率。分子取向和无序的分布随后控制了宏观材料的响应，但是很难用常规技术在纳米尺度上成像。我们展示了一种新形式的光学纳米晶体学，它结合了散射型扫描近场光学显微镜与光学天线和尖端选择性红外振动光谱仪。从具有纳米空间分辨率的分子键取向的对称选择性探测中，我们确定了有机电子材料per四羧酸二酐的聚集体和薄膜中的晶相和取向。映射各个纳米级域内和各个域之间的无序，纳米级异质性的相关混合成像为洞察功能分子固体中的缺陷形成和扩散提供了见识。

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