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Ge‐filled carbon nanotubes (CNTs) with an average diameter of 15–100 nm, and Ge‐filled carbon microtubes (CMTs) with an average diameter of 100‐8000 nm, with diamondlike structures have been prepared by metal‐organic (MO)CVD from organogermanium precursors [(C2H5)4Ge and (n‐C4H9)4Ge]. These new composite structures of arrays of CNTs/germanium nanowires (GeNWs) and CMTs/GeNWs have been characterized by powder X‐ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM), scanning Auger microscopy (SAM), Raman spectroscopy, and field‐emission measurements. The promising field‐emission properties observed for mixtures of CNTs/GeNWs and CMTs/GeNWs form a basis for important applications of these new hybrid nanomaterials.

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