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首页> 外文会议>Reflection, scattering, and diffraction from surfaces II >Reflectance Measurements for Black Absorbers Made of VerticallyAligned Carbon Nanotubes
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Reflectance Measurements for Black Absorbers Made of VerticallyAligned Carbon Nanotubes

机译：垂直 r n对准的碳纳米管制成的黑色吸收体的反射率测量

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摘要

Black coatings have important applications in space-borne infrared systems, absolute radiometers, and radiometric temperature measurements. Recently, researchers have demonstrated close-to-unity absorptance, with diffuse reflection, by using vertically aligned carbon nanotube (VACNT) arrays. The present study deals with the optical properties of highly absorbing VACNT arrays, with surface features from diffuse to specular. Three CNT arrays were fabricated using a thermal chemical vapor deposition (CVD) technique with different growth conditions to produce highly aligned multi-walled CNT arrays. The bidirectional reflectance distribution functions (BRDFs) were measured with a laser scatterometer at a wavelength of 635 nm. Sharp specular peaks can be seen from the BRDF plots for the relatively smooth sample; while for the relatively diffuse samples, the specular peaks are significantly lower. The directional-hemispherical reflectance (DHR) at wavelengths from 400 to 1000 nm was measured with an integrating sphere and a monochromator. Based on Kirchhoff s law, the absorptance was obtained from the DHR to be between 99.5% and 99.9% for all samples in the measured spectral region.
机译：黑色涂料在星载红外系统，绝对辐射计和辐射温度测量中具有重要应用。最近，研究人员已经证明，通过使用垂直排列的碳纳米管（VACNT）阵列，具有近距离的吸收率和漫反射性。本研究涉及高吸收性VACNT阵列的光学特性，其表面特征从漫反射到镜面反射。使用热化学气相沉积（CVD）技术以不同的生长条件制造了三个CNT阵列，以生产高度对齐的多壁CNT阵列。双向反射率分布函数（BRDF）是用激光散射仪在635 nm波长下测量的。从相对平滑的样本的BRDF图可以看到尖锐的镜面反射峰。而对于相对分散的样本，镜面反射峰明显较低。用积分球和单色仪测量400至1000 nm波长处的定向半球反射率（DHR）。根据基尔霍夫定律，从DHR获得的吸收率在所测光谱区域中的所有样品都在99.5％和99.9％之间。

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  • 来源
  • 会议地点 San Diego CA(US)
  • 作者

    X. J. Wang; O. S. Adewuyi; L. P. Wang; B. A. Cola; Z. M. Zhang;

  • 作者单位

    George W. Woodruff School of Mechanical EngineeringrnGeorgia Institute of TechnologyrnAtlanta, GA 30332, USA;

    George W. Woodruff School of Mechanical EngineeringrnGeorgia Institute of TechnologyrnAtlanta, GA 30332, USA;

    George W. Woodruff School of Mechanical EngineeringrnGeorgia Institute of TechnologyrnAtlanta, GA 30332, USA;

    George W. Woodruff School of Mechanical EngineeringrnGeorgia Institute of TechnologyrnAtlanta, GA 30332, USA;

    George W. Woodruff School of Mechanical EngineeringrnGeorgia Institute of TechnologyrnAtlanta, GA 30332, USA;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;
  • 关键词

    Black Absorber; BRDF; Carbon Nanotubes; Reflectance;

    机译：黑色吸收剂； BRDF；碳纳米管；反射率;

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