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首页> 外文会议>Symposium on Covalently Bonded Disordered Thin-Film Materials held December 2-4, 1997, Boston, Massachusetts, U.S.A. >Optical properties of carbon thin films containing nanoparticles
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Optical properties of carbon thin films containing nanoparticles

机译：含纳米颗粒的碳薄膜的光学性质

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摘要

The incorporation of carbon nanoparticles in the forms of nanotubes and bucky onions have shown to improve the mechanical properties of amorphous carbon (a-C) thin films. In this paper we report on the change in the optical properties of a-C films containg nanoparticles. The optical band gap, index of refraction and extinction coefficient are studied. The optical band gap in highly tetrahedral amorphous carbon (ta-C) is found to be around 2 eV. It decreases almost linearly with the sp~2 fraction. It is theorized that the clustering of the sp~2 sites leads to a reduction in the band gap. In this theorized that the clustering of the sp~2 sites leads to a reduction in the band gap. In this paper, we study the influence of large sp~2 clusters in forms of graphitic nanoparticles on the optical of ta-C. We find that the optical gap remains around 1.8 eV even with the large inclusions of clustered nanoparticles. Furthermore, the gap remains close to 1.8 eV even when the sp~2 fraction in the amorphous matrix is increased. The index of refraction however is found to decrease with the sp~2 fraction indicating a reduction in density.
机译：已显示以纳米管和布基洋葱的形式掺入碳纳米颗粒可改善非晶碳（a-C）薄膜的机械性能。在本文中，我们报告了包含纳米颗粒的a-C膜的光学性质的变化。研究了光学带隙，折射率和消光系数。发现高四面体无定形碳（ta-C）的光学带隙约为2 eV。它几乎随sp〜2分数线性减小。从理论上讲，sp〜2位点的聚簇导致带隙的减小。在这种理论上，sp〜2位点的聚簇导致带隙的减小。在本文中，我们研究了石墨纳米颗粒形式的大sp〜2团簇对ta-C光学的影响。我们发现，即使存在大量簇状纳米颗粒，光学间隙仍保持在1.8 eV左右。此外，即使增加非晶基质中的sp〜2分数，间隙仍保持接近1.8 eV。但是，发现折射率随sp〜2分数而降低，表明密度降低。

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