Solid‐State Oxygen and Hydrogen Sensing Devices Based on Copper Dicyanoanthraquinone Diimines

Chong Mou Wang, Huh‐Lerng ‐L Lin, Wehn‐Ying ‐Y Wang, Hwang Yaw Cheng, Lilian Kao Liu

Research output: Contribution to journalArticle

Abstract

Substituted dicyanoanthraqumone diimines (DCNAQI) and their related copper complexes, Cu(DCNAQI), have been synthesized and characterized. Most Cu(DCNAQI) complexes possess an activation energy 80–400 meV and strongly absorb in the IR range. Electrochemical investigations with polycrystailine electrodes as thin films reveal that Cu(DCNAQI) behaves as an n‐type semiconductor. Under bandgap excitation (4000 cm−1), the photoconductance measured with these Cu(DCNAQI) electrodes was greatly promoted under nitrogen, but very sensitive to O2 or H2. When the conductance difference, Δσ/σdark = (σlight ‐ σ darkdark, was plotted vs the partial pressure of the target molecule, a nearly linear relationship was observed. Among Cu(DCNAQI), Cu(β‐methyl‐DCNAQI) gave the greatest senstivity for detection of hydrogen, but Cu(α,α′‐dichloro‐DCNAQI) appeared most sensitive toward oxygen. This remarkable relationship is likely due to retardation of the mobility of electron or hole by interaction with oxygen or hydrogen at the Cu(DCNAQI) electrode surface; a solid‐state oxygen/hydrogen sensing device based on these organic semiconductors is proposed.

Original languageEnglish
Pages (from-to)345-350
Number of pages6
JournalJournal of the Chinese Chemical Society
Volume41
Issue number3
DOIs
Publication statusPublished - 1994 Jun

Keywords

  • Copper dicyanoanthraquinone diimine
  • Gas sensor
  • Organic charge‐transfer complexes
  • Semiconductor

ASJC Scopus subject areas

  • Chemistry(all)

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