Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 185, Issue -, Pages 225-230Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.04.116
Keywords
Carbon nanotubes; Cellulose; Conductive polymer composites; Liquid sensing; Water
Funding
- German Research Foundation (DFG) [MA 2311/4-1]
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Electrically conductive films composed of carbon nanotubes (CNTs) and cellulose matrix were used as water sensors. They exhibited rapid response and high sensitivity, with a relative electrical resistance change of 5500-500% for cellulose-CNT composites with CNT loading from 2 to 10 wt%. This unique performance is well reproducible and high stable even on a long-term scale for 45 days. The sensitivity of cellulose-CNT composites was mainly caused by the hygroscopic swelling of the cellulose matrix, which was investigated by scanning electron microscope and wide-angle X-ray diffraction. The cellulose-CNT composites also showed a high selectivity for water-ethanol solutions with different fraction of water. (C) 2013 Elsevier B.V. All rights reserved.
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