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Optical anisotropy in micromechanically rolled carbon nanotube forest

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Abstract

The bulk appearance of arrays of vertically aligned carbon nanotubes (VACNT arrays or CNT forests) is dark as they absorb most of the incident light. In this paper, two postprocessing techniques have been described where the CNT forest can be patterned by selective bending of the tips of the nanotubes using a rigid cylindrical tool. A tungsten tool was used to bend the vertical structure of CNTs with predefined parameters in two different ways as stated above: bending using the bottom surface of the tool (micromechanical bending (M2B)) and rolling using the side of the tool (micromechanical rolling (M2R)). The processed zone was investigated using a Field Emission Scanning Electron Microscope (FESEM) and optical setup to reveal the surface morphology and optical characteristics of the patterned CNTs on the substrate. Interestingly, the polarized optical reflection from the micromechanical rolled (M2R) sample was found to be significantly influenced by the rotation of the sample. It was observed that, if the polarization of the light is parallel to the alignment of the CNTs, the reflectance is at least 2 x higher than for the perpendicular direction. Furthermore, the reflectance varied almost linearly with good repeatability (~10%) as the processed CNT forest sample was rotated from 0° to 90°.

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Authors and Affiliations

  1. S3CRL Lab (Smart Structure, System, Control Research Laboratory), Mechatronics Engineering Department, Faculty of Engineering, International Islamic University Malaysia, Kuala Lumpur, 50728, Malaysia

    Mohd Asyraf bin Mohd Razib, Masud Rana, Tanveer Saleh & Asan Gani Bin Abdul Muthalif

  2. Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, V6T 1Z4, Canada

    Harrison Fan, Andrew Koch, Alireza Nojeh & Kenichi Takahata

  3. Quantum Matter Institute, University of British Columbia, Vancouver, V6T 1Z4, Canada

    Harrison Fan & Alireza Nojeh

Authors
  1. Mohd Asyraf bin Mohd Razib
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  2. Masud Rana
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  3. Tanveer Saleh
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  4. Harrison Fan
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  5. Andrew Koch
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  6. Alireza Nojeh
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  7. Kenichi Takahata
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  8. Asan Gani Bin Abdul Muthalif
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Correspondence to Harrison Fan.

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Razib, M.A.b., Rana, M., Saleh, T. et al. Optical anisotropy in micromechanically rolled carbon nanotube forest. Electron. Mater. Lett. 13, 442–448 (2017). https://doi.org/10.1007/s13391-017-6422-0

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  • DOI: https://doi.org/10.1007/s13391-017-6422-0

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