Growth of carbon nanowalls at atmospheric pressure for one-step gas sensor fabrication

Kehan Yu, Zheng Bo, Ganhua Lu, Shun Mao, Shumao Cui, Yanwu Zhu, Xinqi Chen, Rodney S. Ruoff, Junhong Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

Carbon nanowalls (CNWs), two-dimensional "graphitic" platelets that are typically oriented vertically on a substrate, can exhibit similar properties as graphene. Growth of CNWs reported to date was exclusively carried out at a low pressure. Here, we report on the synthesis of CNWs at atmosphere pressure using "direct current plasma-enhanced chemical vapor deposition" by taking advantage of the high electric field generated in a pin-plate dc glow discharge. CNWs were grown on silicon, stainless steel, and copper substrates without deliberate introduction of catalysts. The as-grown CNW material was mainly mono- and few-layer graphene having patches of O-containing functional groups. However, Raman and X-ray photoelectron spectroscopies confirmed that most of the oxygen groups could be removed by thermal annealing. A gas-sensing device based on such CNWs was fabricated on metal electrodes through direct growth. The sensor responded to relatively low concentrations of NO2 (g) and NH3 (g), thus suggesting high-quality CNWs that are useful for room temperature gas sensors.

Original languageEnglish (US)
Article number202
JournalNanoscale Research Letters
Volume6
Issue number1
DOIs
StatePublished - Jan 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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