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Optical Anisotropy in Micromechanically Rolled Carbon Nanotube Forest
Mohd Asyraf bin Mohd Razib,Masud Rana,Tanveer Saleh,Harrison Fan,Andrew Koch,Alireza Nojeh,Kenichi Takahata,Asan Gani Bin Abdul Muthalif 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.5
The bulk appearance of arrays of vertically aligned carbonnanotubes (VACNT arrays or CNT forests) is dark as theyabsorb most of the incident light. In this paper, two postprocessingtechniques have been described where the CNTforest can be patterned by selective bending of the tips of thenanotubes using a rigid cylindrical tool. A tungsten tool wasused to bend the vertical structure of CNTs with predefinedparameters in two different ways as stated above: bendingusing the bottom surface of the tool (micromechanicalbending (M2B)) and rolling using the side of the tool(micromechanical rolling (M2R)). The processed zone wasinvestigated using a Field Emission Scanning ElectronMicroscope (FESEM) and optical setup to reveal the surfacemorphology and optical characteristics of the patterned CNTson the substrate. Interestingly, the polarized optical reflection from the micromechanical rolled (M2R) sample was found to besignificantly influenced by the rotation of the sample. It was observed that, if the polarization of the light is parallel to thealignment of the CNTs, the reflectance is at least 2 x higher than for the perpendicular direction. Furthermore, the reflectancevaried almost linearly with good repeatability (~10%) as the processed CNT forest sample was rotated from 0° to 90°.