Ultrathin electronic composite sheets of metallic/semiconducting carbon nanotubes embedded in conjugated block copolymers

Jinwoo Sung, June Huh, Ji Hyuk Choi, Seok Ju Kang, Yeon Sik Choi, Geun Tak Lee, Junhan Cho, Jae Min Myoung, Cheolmin Park

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Ultrathin composite films consisting of mixtures of metallic (m-) and semiconducting (s-) single-walled carbon nanotubes (SWNTs) with a conjugated block copolymer are developed from a solution-based process. The electronic properties of the films are precisely controlled from metallic to semiconducting to insulating. The tunability of the electronic composite sheets is mainly attributed to (1) the efficient dispersion of SWNTs with a conjugated block copolymer in solution, (2) the control of the number of nanotubes by centrifugation, and (3) the individually networked deposition of SWNTs embedded in the conjugated block copolymer on the target substrate by spin-coating. A highly reliable field-effect transistor with a networked composite film is realized with a specific range of tube density and a high on/off current ratio of approximately 106 which resulted from the Schottky barriers evolved between the individual m- and s-SWNTs in the network. There is also great freedom when choosing both the gate dielectrics and source-drain electrodes for transistors containing the composite films. Furthermore, the fabricated electronic composites are highly transparent, flexible, and chemically robust and thus, they can be conveniently micropatterned by photolithography, as well as by unconventional transfer printing techniques. Novel ultrathin electronic composite sheets of individually networked SWNTs dispersed and embedded in a conjugated diblock polymer are developed. The electronic properties of the films are precisely controlled. A highly reliable field-effect transistor with a composite film is realized. The fabricated electronic composites are conveniently micropatterned by photolithography, as well as by unconventional transfer printing techniques.

Original languageEnglish
Pages (from-to)4305-4313
Number of pages9
JournalAdvanced Functional Materials
Volume20
Issue number24
DOIs
Publication statusPublished - 2010 Dec 21
Externally publishedYes

Keywords

  • conjugated block copolymer
  • field-effect transistors
  • nanocomposites
  • Schottky barrier transistors
  • SWNTs

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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