基于Pd-SWCNTs的UWB-RFID无线瓦斯传感器研究

Study of UWB-RFID wireless methane sensor based on Pd-SWCNTs

针对在室温环境下探测瓦斯浓度,提出一种基于钯掺杂单壁碳纳米管(Pd-SWCNTs)的超宽带射频识别(UWB-RFID)传感器。传感器为薄型标签,由传感探头和电磁界面组成,其中传感探头为一PdSWCNTs加载的交叉指型电极(IDE);电磁界面由天线、微带线和终端负载组成。Pd-SWCNTs感知瓦斯浓度,引起IDE电流的变化,形成带隙幅度调制和带隙频率调制两种识别模式。当瓦斯浓度从0×10-6增加到100×10-6,基于带隙调幅调制的识别灵敏度为-9.32 d B;而基于带隙调频调制的识别灵敏度为-11.30 d B。

Aiming at detection of concentration of methane at room temperature,a sensor in ultra-wideband radio frequency identification（ UWB-RFID） is proposed based on Pd-doped single walled carbon nanotubes（ PdSWCNTs）. The proposed sensor is a thinly filmed tag composed of a sensor probe and an EM interface,sensor probe is an inter-digital electrode（ IDE） that takes the Pd-SWCNTs as load; The EM interface is composed of an antenna,a microstrip line and a terminal load. When the Pd-SWCNTs senses concentration of methane,the current of IDE will be changed,form two detection modes which are band-gap amplitude modulation and band-gap frequency modulation. When concentration of methane from 0 × 10- 6to 100 × 10- 6,the identifiable sensitivity in terms of the band-gap amplitude modulation is- 9. 32 d B; while the identifiable sensitivity in terms of the bandgap frequency modulation is- 11. 30 d B.