NDLI: Optical anisotropy in micromechanically rolled carbon nanotube forest

Content Provider	Springer Nature Link
Author	Razib, Mohd Asyraf bin Mohd Rana, Masud Saleh, Tanveer Fan, Harrison Koch, Andrew Nojeh, Alireza Takahata, Kenichi Muthalif, Asan Gani Bin Abdul
Copyright Year	2017
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°.
Starting Page	442
Ending Page	448
Page Count	7
File Format	PDF
ISSN	17388090
Journal	Electronic Materials Letters
Volume Number	13
Issue Number	5
e-ISSN	20936788
Language	English
Publisher	The Korean Institute of Metals and Materials
Publisher Date	2017-04-20
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	carbon nanotube forest micromechanical rolling micromechanical bending optical anisotropy optical polarization Optical and Electronic Materials Condensed Matter Physics Nanotechnology and Microengineering Characterization and Evaluation of Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials

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