Beyond ?- C3 N4 -Fullerene-like carbon nitride : A promising coating material
Beyond ?- C3 N4 -Fullerene-like carbon nitride : A promising coating material
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DOI：
10.1116/1.2738505
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发表时间：
2007-05
期刊：
影响因子：
--
通讯作者：
J. Neidhardt;L. Hultman
中科院分区：
文献类型：
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作者：
J. Neidhardt;L. Hultman
即使合成超硬晶？- C3 - N4仍然难以捉摸，由于其竞争性质，非晶碳- Nx化合物越来越重要。特别是类富勒烯同素异形体的碳纳米管具有优异的弹性和低压痕功。这种新型固体薄膜材料的特点是具有弯曲和相交基底面的微观结构。与纯碳材料相比，将氮代入以sp2为主的杂化石墨层中，以低得多的能量成本触发了曲率诱导五边形和面间交联的形成。“类富勒烯”一词的产生是为了反映弯曲结构单元的纳米尺度。因此，类富勒烯C Nx通过键角偏转和石墨面间晶格间距的压缩而变形，而s p2键的优越强度抑制了塑性变形，使材料具有极好的弹性特性。合成条件可调节基面取向、曲率半径和交联密度。在这里，大量前体分子的存在是一个决定因素。材料的固有弹性与碳基有益摩擦相结合，有望产生许多摩擦学应用。©2007美国真空学会。
Even though the synthesis of super-hard-crystalline ?- C3 N4 remains elusive, noncrystalline C Nx compounds are of increasing importance owing to their competitive properties. Especially the fullerene-like allotrope of C Nx exhibits outstanding elasticity in combination with low work of indentation. This new class of thin solid film materials is characterized by a microstructure of bent and intersecting basal planes. Substitutional incorporation of nitrogen into the predominantly s p2 hybridized graphitic layer triggers the formation of curvature-inducing pentagons and interplanar cross-links at a much lower energy cost as compared to carbon-only materials. The term "fullerene- like" was coined to reflect the nanometer scale of curved structural units. Thus, fullerene-like C Nx deforms by bond angle deflection and compression of the graphitic interplanar lattice spacing, whereas the superior strength of the s p2 bonds inhibits plastic deformation giving the material an extremely resilient character. The orientation, radius of curvature of basal planes, and density of cross-linking can be adjusted by the synthesis conditions. Here, the existence of significant numbers of precursor molecules is a determining factor. The inherent resiliency of the material in combination with the carbon-based beneficial friction promises to give rise to numerous tribological applications. © 2007 American Vacuum Society.