Direct growth of horizontally aligned carbon nanotubes between electrodes and its application to field-effect transistors

Yasuhiko Hayashi, B. Jang, T. Iijima, T. Tokunaga, A. Hayashi, M. Tanemura, G. A.J. Amaratunga

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper presents direct growth of horizontally-aligned carbon nanotubes (CNTs) between two predefined various inter-spacing up to tens of microns of electrodes (pads) and its use as CNT field-effect transistors (CNT-FETs). Using the conventional photolithography technique followed by thin film evaporation and lift off, the catalytic electrodes (pads) were prepared, consisting of Pt, Al and Fe triple layers on SiO 2/Si substrate. The grown CNTs were horizontally-aligned across the catalytic electrodes on the modified gold image furnace hot stage (thermal CVD) at 800 °C by using an alcohol vapor as the carbon source. Scanning and transmission electron microcopies (SEM/TEM) were used to observe the structure, growth direction and density of CNTs, while Raman spectrum analysis was used to indicate the degree of amorphous impurity and diameter of CNTs. Both single-and multi-wall CNTs with diameters of 1.1-2.2 nm were obtained and the CNT density was controlled by thickness of Fe catalytic layer. Following horizontally-aligned growth of CNTs, the electrical properties of back-gate CNT-FETs were measured and showd p-type conduction behaviors of FET.

Original languageEnglish
Pages (from-to)11011-11014
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number12
DOIs
Publication statusPublished - Dec 1 2011
Externally publishedYes

Keywords

  • CNT field-effect transistors (CNTFETs)
  • Horizontally-aligned carbon nanotubes (CNTs)
  • Raman spectroscopy
  • Scanning and transmission electron microcopies (SEM/TEM)
  • Thermal CVD

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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