A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs).

A Capacitive Humidity Sensor Based on Multi-Wall Carbon Nanotubes (MWCNTs).
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DOI:
10.3390/s90907431
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发表时间:
2009
期刊:
Sensors (Basel, Switzerland)
影响因子:
--
通讯作者:
Suo CG
Suo CG
中科院分区:
其他
文献类型:
--
作者:
Chen WP;Zhao ZG;Liu XW;Zhang ZX;Suo CG

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本文介绍了一种新型电容式湿度传感器。该传感器由两个涂有碳纳米管(MWCNT)薄膜的平板电极以及位于传感器四个角的四块隔离介质组成。根据毛细凝聚原理,传感器的电容信号对相对湿度(RH)敏感,该电容信号可通过电容 - 电压转换电路转换为电压信号。在环境温度为25°C的条件下,使用不同的饱和盐溶液对传感器进行测试,其相对湿度分别约为11%至97%。本文讨论了碳纳米管薄膜的作用、电极间距的影响、传感器的温度特性以及重复性。
A new type of capacitive humidity sensor is introduced in this paper. The sensor consists of two plate electrodes coated with MWCNT films and four pieces of isolating medium at the four corners of the sensor. According to capillary condensation, the capacitance signal of the sensor is sensitive to relative humidity (RH), which could be transformed to voltage signal by a capacitance to voltage converter circuit. The sensor is tested using different saturated saline solutions at the ambient temperature of 25 °C, which yielded approximately 11% to 97% RH, respectively. The function of the MWCNT films, the effect of electrode distance, the temperature character and the repeatability of the sensor are discussed in this paper.
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