Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Nanostructures are important for a wide area of applications, but are very often difficult to fabricate. A novel and basic approach for controlled nanofilament growth in an organic/inorganic composite material is demonstrated. Thin films of MoO<jats:sub>3</jats:sub>‐doped 4′‐bis(<jats:italic>N</jats:italic>‐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<jats:sub>3</jats:sub> agglomerations are identified for different doping concentrations. A 3D reconstruction of the thin film yielded by electron tomography reveals a filamentous structure of MoO<jats:sub>3</jats:sub> 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<jats:sub>3</jats:sub> agglomeration cannot be detected.</jats:p>