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Observation of Filamentous Nanostructures in Organic-Inorganic Composite Thin Films Deposited by Co-Evaporation

机译:共蒸发沉积有机-无机复合薄膜中丝状纳米结构的观察

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摘要

Nanostructures are important for a wide area of applications, but are very often difficult to fabricate. A novel and basic approach for controlled nanofila-ment growth in an organic/inorganic composite material is demonstrated. Thin films of MoO_3-doped 4'-bis(N-carbazolyl)-1,1‘-biphenyl are grown via vacuum sublimation and analyzed using advanced electron microscopy and spectroscopy techniques. Using electron spectroscopic imaging in the core-loss and low-loss regime, MoO_3 agglomerations are identified for different doping concentrations. A 3D reconstruction of the thin film yielded by electron tomography reveals a filamentous structure of MoO_3 within the organic matrix. These filaments are preferentially oriented along the growth direction and are only a few nanometers in diameter. Furthermore, control of the filament growth is possible by changing the substrate temperature because for composites grown on substrates cooled to 120 K MoO_3 agglomeration cannot be detected.
机译:纳米结构对于广泛的应用很重要,但是通常很难制造。新颖和基本的方法来控制有机/无机复合材料中纳米丝的生长。 MoO_3掺杂的4'-双(N-咔唑基)-1,1'-联苯薄膜通过真空升华生长,并使用先进的电子显微镜和光谱技术进行分析。使用在磁芯损耗和低损耗状态下的电子光谱成像,可以确定不同掺杂浓度的MoO_3团聚体。通过电子断层扫描对薄膜进行的3D重建揭示了有机基质中MoO_3的丝状结构。这些细丝优选沿生长方向取向,并且直径仅几纳米。此外,由于无法检测冷却至120 K MoO_3团聚的基材上生长的复合材料,因此可以通过更改基材温度来控制细丝生长。

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  • 来源
    《Advanced Functional Materials》 |2013年第17期|2130-2136|共7页
  • 作者单位

    Institut Fuer Hochfrequenztechnik Technische Universitaet Braunschweig Schleinitzstrasse 22, 38106 Braunschweig, Germany,InnovationLab GmbH Speyererstrasse 4, 69115 Heidelberg, Germany;

    CellNetworks, BioQuant, Universitaet Heidelberg Im Neuenheimer Feld 267, 69115 Heidelberg, Germany;

    Institut Fuer Hochfrequenztechnik Technische Universitaet Braunschweig Schleinitzstrasse 22, 38106 Braunschweig, Germany,InnovationLab GmbH Speyererstrasse 4, 69115 Heidelberg, Germany;

    Institut Fuer Hochfrequenztechnik Technische Universitaet Braunschweig Schleinitzstrasse 22, 38106 Braunschweig, Germany,InnovationLab GmbH Speyererstrasse 4, 69115 Heidelberg, Germany;

    CellNetworks, BioQuant, Universitaet Heidelberg Im Neuenheimer Feld 267, 69115 Heidelberg, Germany;

    Institut Fuer Hochfrequenztechnik Technische Universitaet Braunschweig Schleinitzstrasse 22, 38106 Braunschweig, Germany;

    Institut Fuer Hochfrequenztechnik Technische Universitaet Braunschweig Schleinitzstrasse 22, 38106 Braunschweig, Germany;

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