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Title: Direct current injection and thermocapillary flow for purification of aligned arrays of single-walled carbon nanotubes

Aligned arrays of semiconducting single-walled carbon nanotubes (s-SWNTs) represent ideal configurations for use of this class of material in high performance electronics. Development of means for removing the metallic SWNTs (m-SWNTs) in as-grown arrays represents an essential challenge. Here, we introduce a simple scheme that achieves this type of purification using direct, selective current injection through interdigitated electrodes into the m-SWNTs, to allow their complete removal using processes of thermocapillarity and dry etching. Experiments and numerical simulations establish the fundamental aspects that lead to selectivity in this process, thereby setting design rules for optimization. Single-step purification of arrays that include thousands of SWNTs demonstrates the effectiveness and simplicity of the procedures. The result is a practical route to large-area aligned arrays of purely s-SWNTs with low-cost experimental setups.
Authors:
; ; ; ; ; ; ;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8]
  1. Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
  2. School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907 (United States)
  3. Institute of Solid Mechanics, Beihang University, Beijing 100191 (China)
  4. Department of Electrical Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
  5. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
  6. Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)
  7. Department of Engineering Mechanics and Soft Matter Research Center, Zhejiang University, Hangzhou 310027 (China)
  8. Department of Civil and Environmental Engineering, Department of Mechanical Engineering, Center for Engineering and Health, and Skin Disease Research Center, Northwestern University, Evanston, Illinois 60208 (United States)
Publication Date:
OSTI Identifier:
22399394
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CARBON NANOTUBES; COMPUTERIZED SIMULATION; DIRECT CURRENT; ELECTRODES; OPTIMIZATION; PERFORMANCE; PURIFICATION; SEMICONDUCTOR MATERIALS