Slobodian Petr, Riha Pavel, Olejnik Robert, Matyas Jiri, Slobodian Rostislav
Centre of Polymer Systems, University Institute, Tomas Bata University, Tr. T. Bati 5678, 760 01 Zlin, Czech Republic.
Polymer Centre, Faculty of Technology, Tomas Bata University, nam. T.G. Masaryka 275, 760 01 Zlin, Czech Republic.
Sensors (Basel). 2021 Jan 5;21(1):298. doi: 10.3390/s21010298.
A novel microstrip resonant vapor sensor made from a conductive multiwalled carbon nanotubes/ethylene-octene copolymer composite, of which its sensing properties were distinctively altered by vapor polarity, was developed for the detection of organic vapors. The alteration resulted from the modified composite electronic impedance due to the penetration of the vapors into the copolymer matrix, which subsequently swelled, increased the distances between the carbon nanotubes, and disrupted the conducting paths. This in turn modified the reflection coefficient frequency spectra. Since both the spectra and magnitudes of the reflection coefficients at the resonant frequencies of tested vapors were distinct, a combination of these parameters was used to identify the occurrence of a particular vapor or to differentiate components of vapor mixtures. Thus, one multivariate MWCNT/copolymer microstrip resonant sensor superseded an array of selective sensors.
一种由导电多壁碳纳米管/乙烯-辛烯共聚物复合材料制成的新型微带谐振式蒸汽传感器被开发用于检测有机蒸汽，其传感特性会因蒸汽极性而发生显著变化。这种变化是由于蒸汽渗透到共聚物基体中导致复合电子阻抗发生改变，随后共聚物基体膨胀，增加了碳纳米管之间的距离，并破坏了导电路径。这反过来又改变了反射系数频谱。由于测试蒸汽在谐振频率处的反射系数频谱和幅度都各不相同，因此将这些参数组合起来用于识别特定蒸汽的出现或区分蒸汽混合物的成分。这样，一个多变量的MWCNT/共聚物微带谐振传感器就取代了一系列选择性传感器。
