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Carbon Nanotube network based sensors

机译:基于碳纳米管网络的传感器

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We demonstrate three types of sensors based on spray-deposited Carbon Nanotube (CNT) networks on flexible substrates: humidity sensors, dew-point sensors and time-temperature indicators. The presence of Sodium Dodecylsulphate (SDS) significantly increases the sensitivity of the film resistance of CNT networks to changes of relative humidity. We observe up to a 3% change in film resistance in the 30–75% range of relative humidity, with a non-linear relationship. When these SDS-impregnated CNT films are cooled to the dew-point of air, with the temperature of the film monitored, the associated increase in sheet resistance can be used to establish the dew-point temperature. We use acid-doped CNT networks as time-temperature indicators, exploiting the de-doping of the CNT networks at higher temperature. We observe an increase in film resistance of such networks at temperatures higher than 50 °C. The rate of the resistance increase follows the Arrhenius law. The extent of the resistance increase ranges from ∼30%at 50 °C to >300% at 100 °C.
机译:我们展示了基于柔性基板上的喷雾沉积的碳纳米管(CNT)网络的三种类型的传感器:湿度传感器,露点传感器和时间温度指示器。十二烷基硫酸钠(SDS)的存在显着提高了CNT网络膜阻力的灵敏度,以变化相对湿度的变化。我们观察到30-75%的相对湿度范围内的薄膜抗性变化高达3%,具有非线性关系。当将这些SDS浸渍的CNT薄膜冷却到空气的露点时,随着薄膜的温度监测,可用于建立露点温度的相关增加的薄层。我们使用酸掺杂的CNT网络作为时间温度指示器,利用在较高温度下的CNT网络的去掺杂。我们观察到高于50°C的温度的这种网络的膜阻力增加。抵抗力增加遵循阿列尼乌斯法律。电阻的程度在100℃下在50℃下在50℃至300%的范围内。

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