Unique water sensors based on carbon nanotube-cellulose composites

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• 作者：Haisong Qi ; Edith M?der ; Jianwen Liu
• 关键词：Carbon nanotubes ; Cellulose ; Conductive polymer composites ; Liquid sensing ; Water
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：185
• 期：Complete
• 页码：225-230
• 全文大小：1218 K

文摘

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.