Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 59, Issue -, Pages 438-444Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2015.10.036
Keywords
Ammonia; Hydroxyapatite; Polypyrrole; Polyaniline; Gas sensing property
Categories
Funding
- National Natural Science Foundation of China [51272289]
- Fundamental Research Funds for the Central Universities of Central South University [2015zzts180]
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In order to improve the gas sensing properties, hydroxyapatite (HAp)-based composites were prepared by mixing with different contents of conductive polymers: polypyrrole (PPy) and polyaniline (PAni). The compositions, microstructures and phase constitutions of polymer/HAp composites were characterized, and the sensing properties were studied using a chemical gas sensing (CGS-8) system. The results showed that, compared to pure HAp, the sensitivities of the composites to ammonia were improved significantly. 5%PPy/HAp and 20%PAni/HAp composites exhibited the best sensitivities to ammonia, and the sensitivities at 500 ppm were 86.72% and 86.18%, respectively. Besides, the sensitivity of 5%PPy/HAp at 1 000 ppm was up to 90.7%. Compared to pure PPy and PAni, the response and the recovery time of 5%PPy/HAp and 20%PAni/HAp at 200 ppm were shortened several times, and they were 24 s/245 sand 15 s/54 s, respectively. In addition, the composites showed a very high selectivity to ammonia. The mechanism for the enhancement of the sensitivity to ammonia was also discussed. The polymer/HAp composites are very promising in applications of ammonia sensors. (C) 2015 Elsevier B.V. All rights reserved.
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