Photocurrent measurements of carbon nanotube networks with physical adsorption of oxygen molecules

Donghun Kang, Chanjin Park, Noejung Park, Wanjun Park

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We report persistent photocurrent measurements of carbon nanotube networks with various pressures of hydrogen, ammonia and oxygen gases. The maximum build-up photocurrent drops substantially as the gas pressure is increased. However, the decay time is very sensitive to the gas species. While the decay time increases significantly under oxygen, only a modest increase is observed under H2 and NH3. The ab initio electronic structure calculations show that a physical adsorption of O2 molecules induces a shallow trap level within the band gap of the carbon nanotube, which is associated with an increase in the decay time.

Original languageEnglish
Pages (from-to)3343-3347
Number of pages5
JournalJournal of the Korean Physical Society
Volume53
Issue number6
DOIs
StatePublished - 2008 Dec 1

Keywords

  • Carbon nanotubes
  • Transport

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