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Solid‐State Oxygen and Hydrogen Sensing Devices Based on Copper Dicyanoanthraquinone Diimines
Author(s) -
Wang Chong Mou,
Lin HuhLerng,
Wang WehnYing,
Cheng Hwang Yaw,
Liu Lilian Kao
Publication year - 1994
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199400047
Subject(s) - chemistry , copper , oxygen , hydrogen , electrode , semiconductor , electrochemistry , band gap , inorganic chemistry , conductance , analytical chemistry (journal) , photochemistry , optoelectronics , physics , mathematics , organic chemistry , combinatorics , chromatography
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 O 2 or H 2 . When the conductance difference, Δσ/σ dark = (σ light ‐ σ dark )σ dark , 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.