期刊
ORGANIC ELECTRONICS
卷 14, 期 4, 页码 1189-1196出版社
ELSEVIER
DOI: 10.1016/j.orgel.2013.01.033
关键词
Porphyrin; Chemi-resistive sensor; Thin films; Organic semiconductors
A jaw-like bis-porphyrin (bis-TPP) molecule was synthesized anchoring of two porphyrin molecules to a benzene ring at the meta positions through the ester linkage. The bis-TPP molecule and its zinc-derivative (Zn-bis-TPP) were spin-coated on glass surfaces to construct two chemiresistive room temperature NH3 gas sensors. Both the films showed high selectivity, reproducibility and reversibility in sensing NH3 gas (5-40 ppm) in air. The sensing characteristics of the Zn-bis-TPP films (response (2 s) and recovery (2.5 min) times; linear response (952%)) were better than that of the bis-TPP films (response (8 s) and recovery (7.5 min) times; linear response (131%)). This is attributed to the amorphous nature of the former. (C) 2013 Elsevier B.V. All rights reserved.
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