Carbon-nanotube-based resonant-circuit sensor for ammonia
Carbon-nanotube-based resonant-circuit sensor for ammonia
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DOI：
10.1063/1.1486481
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发表时间：
2002-06-17
影响因子：
4
通讯作者：
Rao, AM
中科院分区：
文献类型：
--
作者：
Chopra, S;Pham, A;Rao, AM
我们展示了用于监测氨气存在的高灵敏度和快速响应微波谐振传感器的设计和开发。该传感器由涂有单壁或多壁碳纳米管的圆盘电磁谐振电路组成，对吸附的气体分子高度敏感。暴露于氨后，传感器的电谐振频率显着下降 4.375 MHz。这些传感器的恢复和响应时间名义上为 10 分钟。该技术适用于设计远程传感器系统，以监测密封不透明封装内的气体以及不允许物理电线连接的环境条件。 (C) 2002 年美国物理研究所。
We present the design and development of highly sensitive and fast-responsive microwave resonant sensors for monitoring the presence of ammonia gas. The sensor consists of a circular disk electromagnetic resonant circuit coated with either single- or multiwalled carbon nanotubes that are highly sensitive to adsorbed gas molecules. Upon exposure to ammonia, the electrical resonant frequency of the sensor exhibits a dramatic downshift of 4.375 MHz. The recovery and response times of these sensors are nominally 10 min. This technology is suitable for designing remote sensor systems to monitor gases inside sealed opaque packages and environmental conditions that do not allow physical wire connections. (C) 2002 American Institute of Physics.