A dew sensor based on modified carbon black and polyvinyl alcohol composites
A dew sensor based on modified carbon black and polyvinyl alcohol composites
复制标题
基于改性炭黑和聚乙烯醇复合材料的露水传感器
DOI：
10.1016/j.snb.2013.11.004
复制
发表时间：
2014-03-01
影响因子：
8.4
通讯作者：
Zhang, Tong
中科院分区：
文献类型：
--
作者：
Jiang, Kai;Fei, Teng;Zhang, Tong
采用自由基聚合法制备了聚乙烯吡咯烷酮接枝炭黑(CB-PVP)。所得的CB-PVP在水中分散良好。分别制备了CB/PVA和CB-PVP/PVA露水传感器，并对其湿度开关特性进行了研究。采用热退火工艺有效地提高了敏感膜的稳定性。CB/PVA和CB-PVP/PVA传感器均表现出明显的湿度开关特性，且CB-PVP/PVA传感器的性能优于CB/PVA传感器。在6wt%CB-PVP/PVA薄膜中，在相对湿度(RH)低于80%时，电阻约为10k欧米加，当相对湿度超过85%时，电阻急剧增加，在100%RH时，电阻达到170k欧米加。用直流反极法对CB-PVP/PVA材料的导电机理进行了探讨。CB-PVP/PVA复合材料是一种很有前途的露水传感材料。(C)2013爱思唯尔B.V.保留所有权利。
Polyvinylpyrrolidone-grafted carbon black (CB-PVP) was prepared by a free radical polymerization reaction. The resultant CB-PVP could disperse well in water. Dew sensors based on CB/PVA (polyvinyl alcohol) and CB-PVP/PVA were obtained respectively, and their humidity switching properties were researched. Thermal annealing was used to improve the stability of the sensitive films effectively. Both CB/PVA and CB-PVP/PVA sensors showed obvious humidity switching properties, and CB-PVP/PVA sensor performed properties better than CB/PVA sensor. In the case of the 6 wt% CB-PVP/PVA film, the resistance was about 10 k Omega below 80% relative humidity (RH) and increased sharply over 85% RH, with a resistance of 170 k Omega at 100% RH. The conductive mechanism of the CB-PVP/PVA materials was discussed through direct current reverse polarity method. The CB-PVP/PVA composite is a promising dew sensing material. (C) 2013 Elsevier B.V. All rights reserved.