Electrical and humidity-sensing properties of 1-(4-carboxylic acid phenyl)-2,5-dimethyl-1H-pyrrole doped with both KOH and K2CO3 salts

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題名:	Electrical and humidity-sensing properties of 1-(4-carboxylic acid phenyl)-2,5-dimethyl-1H-pyrrole doped with both KOH and K2CO3 salts
作者:	Su, PG (Su, Pi-Guey) Syu, HC (Syu, Hong-Ci)
貢獻者:	化學系
關鍵詞:	Humidity sensor N-substituted pyrrole derivative KOH K2CO3 Sensitivity and linearity
日期:	2017-03
上傳時間:	2017-04-28 09:41:13 (UTC+8)
摘要:	Novel impedance-type humidity sensors were made of 1-(4-carboxylic acid phenyl)-2,5-dimethyl-1H-pyrrole that was doped with KOH and K2CO3 salts. The humidity-sensing properties of 1-(4-carboxylic acid phenyl)-2,5-dimethyl-1H-pyrrole were improved by doping with two alkali salts (KOH and K2CO3), whose dissociation constants differed greatly from each other. The electrical properties of 1-(4-carboxylic acid phenyl)-2,5-dimethyl-1H-pyrrole that was doped with KOH or a mixture of KOH and K2CO3 were examined in detail and found to be functions of relative humidity (RH). Additionally, the effects of the salts on the sensing properties (linearity and sensitivity) were elucidated. The sensor that was made of the 1-(4-carboxylic acid phenyl)-2,5-dimethy1-1H-pyrrole/KOH/K2CO3 composite film exhibited favorable impedance, high sensitivity, good linearity, small hysteresis, a short response recovery time, a weak dependence on temperature and high long-term stability over the humidity range studied. The sensing mechanism of the 1-(4-carboxylic acid phenyl)-2,5-dimethyl-1H-pyrrole/KOH/K2CO3 composite film was elucidated using impedance plots. (C) 2016 Elsevier B.V. All rights reserved.
關聯:	SENSORS AND ACTUATORS B-CHEMICAL 卷: 240 頁碼: 595-603
顯示於類別:	[Department of Chemistry & Graduate Institute of Applied Chemistry ] journal articles

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