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Nanostructured carbon films

 
: Schultrich, B.; Scheibe, H.J.; Mai, H.

:

Advanced engineering materials 2 (2000), No.7, pp.419-422
ISSN: 1438-1656
ISSN: 1615-7508
English
Journal Article
Fraunhofer IWS ()
Nanotechnologie; Kohlenstoff-Schichten; Laser-Arc; PVD; Keramik; Kohlenstoff; Schicht; Multischicht; Nanomaterialien; Grenzfläche

Abstract
Carbon materials are distinguished by their unusual variety of structures. They allow the realization of a broad spectrum of properties leading to partially opposite features based on a single element. This manifold stems mainly from the existence of two different types of bonding between the carbon atoms, denoted by the sp3 and the sp2 hybridization of the wavefunctions. The tetrahedral sp3 bonds as in diamond lead to very stiff three-dimensional carbon networks. The trigonale sp2 bonds as in graphite result in layered structures. These graphene layers are only loosely connected with each other and can be easily displaced and bent. In dependence of the growth process they can form turbostratic or even fullerene-like structures with curved or closed lamellae systems. Both types of bonding may be combined in amorphous films [1]or nanodisperse heterostructures [2]. In the following different types of such nanostructured carbon films will be discussed. More detailed structural investigations demand rather expensive surface-analytical methods such as high resolution transmission electron microscopy (HRTEM) or electron energy loss spectroscopy (EELS). As it will be shown a quick valuation of the underlying structure and of relevant properties is possible by laser-acoustics (characterizing the mechanical behavior) [3,4] and spectral ellipsometry (characterizing optical properties).

: http://publica.fraunhofer.de/documents/N-1951.html