Simultaneous growth of MWCNTs at different temperatures in a variable gradient furnace

V. Grossi*, A. Urbani, Andrea Giugni, C. Cantalini, S. Santucci, M. Passacantando

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Multi-walled carbon nanotubes (MWCNTs) have been grown, simultaneously at different temperatures (600 °C, 700 °C, 725 °C, and 750 °C), by thermal chemical vapour deposition (CVD) of acetylene (C2H 2) gas, in ammonia (NH3) atmosphere. The samples have been characterized morphologically by scanning electron microscopy (SEM) and a structurally by Raman spectroscopy. These analyses show that, when the temperature of substrate increases, the CNT average diameter and the density distribution decrease, and the CNTs are less defective. However there is a temperature limit (725 °C) for CNT growth. We have grown CNTs onto Si 3N4/Si substrates with Pt electrodes, in order to realize the gas sensing devices. The CNTs grown at 725 °C, exhibit a fast response and a high sensitivity to NO2 gas.

Original languageEnglish (US)
Title of host publicationSmart Materials for Smart Devices and Structures
PublisherTrans Tech Publications Ltd
Pages77-82
Number of pages6
ISBN (Print)3908451701, 9783908451709
DOIs
StatePublished - Jan 1 2009
EventEMRS Symposium C: Smart Materials for Smart Devices and Structures - Warsaw, Poland
Duration: Sep 15 2008Sep 19 2008

Publication series

NameSolid State Phenomena
Volume154
ISSN (Print)1012-0394

Other

OtherEMRS Symposium C: Smart Materials for Smart Devices and Structures
CountryPoland
CityWarsaw
Period09/15/0809/19/08

Keywords

  • Carbon nanotubes
  • Chemical vapour deposition
  • Raman spectroscopy
  • Scanning electron microscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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