Citation: Xue-diao Cai, Ru Huang, Ya-nan Guo. PREPARATION AND CHARACTERIZATION OF HUMIDITY SENSOR BASED ON POLY(3-ALKYL)PYRROLE CONTAINING PHOSPHONIC ACID GROUPS[J]. Chinese Journal of Polymer Science, ;2013, 31(10): 1443-1450. doi: 10.1007/s10118-013-1341-5 shu

PREPARATION AND CHARACTERIZATION OF HUMIDITY SENSOR BASED ON POLY(3-ALKYL)PYRROLE CONTAINING PHOSPHONIC ACID GROUPS

1.
Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710062, China

Corresponding author: Xue-diao Cai,
Received Date: 2 November 2012
Revised Date: 15 February 2013

Fund Project: the Fundamental Research Funds for the Central Universities, China (No. GK 200902008).

Poly(3-alkyl)pyrroles containing phosphonic acid groups with different alkyl segment lengths were chemical synthesized and the properties were measured by FTIR and UV-Vis spectroscopy. FTIR and UV-Vis results showed that the synthesized polymers were in a low doping level through chemical polymerization. By spin-coating on the surface of substrates, the polymer can be used as a humidity sensor. The change of DC electric current of the polypyrroles varies with the chain length of the alkyl substituents. The capacitance increases with the increase of the humidity and resistance decreases with the increase of humidity. This result is different from that of polypyrrole without alkyl substituents due to the influence of the phosphonic acid group. The sensor showed the resistive-type at high relative humidity, and the capacitivetype at the low relative humidity. The sensor exhibited very fast response to the change of environment humidity.
- Poly(3-alkyl)pyrrole,
- Humidity sensor,
- Phosphonic acid group,
- Capacitive-type,
- Resistive-type
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