Balzer Frank, Fratschko Mario, Resel Roland, Schiek Manuela
SDU Centre for Photonic Engineering, University of Southern Denmark, Alsion 2, 6400 So̷nderborg, Denmark.
Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria.
Langmuir. 2024 Dec 10;40(49):25862-25870. doi: 10.1021/acs.langmuir.4c03073. Epub 2024 Nov 23.
Organic molecular beam deposition (OMBD) of -hexaphenylene (p6P) on polycrystalline platinum results in the formation of unique nanoaggregates, predominantly as nanofibers and nanoribbons. These aggregates exhibit distinct morphological properties, as revealed by atomic force microscopy (AFM). Grazing incidence X-ray diffraction (GIXD) confirms the p6P herringbone structure as partially oriented aggregates with a bias of previously observed contact planes parallel to the substrate. The optical properties of the aggregates are analyzed using polarization microscopy, fluorescence microscopy, and Raman microscopy to distinguish three different aggregate types with a focus on aspects such as molecule orientation within the aggregates, including those lying and standing upright. Polarized microscopy indicates that the molecular orientation within the fluorescing, fiber-like aggregates is generally perpendicular to the long fiber axis and parallel to the substrate, which seems not to be the case for the other two types. This finding is crucial for applications utilizing p6P's polarized emission, such as in photonic and optoelectronic devices.
在多晶铂上通过有机分子束沉积（OMBD）法沉积六苯并苯（p6P）会形成独特的纳米聚集体，主要为纳米纤维和纳米带。原子力显微镜（AFM）显示，这些聚集体呈现出独特的形态特性。掠入射X射线衍射（GIXD）证实，p6P的人字形结构为部分取向的聚集体，其先前观察到的接触面平行于基底存在一定偏向。利用偏光显微镜、荧光显微镜和拉曼显微镜分析聚集体的光学性质，以区分三种不同的聚集体类型，重点关注聚集体内部分子取向等方面，包括平躺和直立的分子。偏光显微镜表明，在发荧光的纤维状聚集体中，分子取向通常垂直于长纤维轴且平行于基底，其他两种类型似乎并非如此。这一发现对于利用p6P偏振发射的应用至关重要，例如在光子和光电器件中。
