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首页> 外文期刊>Physical chemistry chemical physics: PCCP >The influence of non-specific molecular patitioning of analytes on the electrical rsponses of conducting orgaic polymer gas sensors
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The influence of non-specific molecular patitioning of analytes on the electrical rsponses of conducting orgaic polymer gas sensors

机译：分析物的非特异性分子分配对导电有机聚合物气体传感器电响应的影响

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摘要

A systematic study is presented of the steady-state electricla resistance responses of a variety of conducting polymer gas sensors to 34 volatile organic chemiclas comprising alcohols,esters,aromatics and alkanes. The sensors were prepared from alkyl substituted polypyrroles and a polyalkylterthiophene;poly(3',3"-didecyl-2,2";5',2"-tethiophene),doped with a variety of couneranions. Relationships between the vapour concentration producing a fixed amplitude of sensor response 9C_g0 and analyte satuated vapour pressure (SVP) have been investigated both theoretically and experimentally. Homologous anlaytes within the investigated classes displayed linear correlations between C_g and SVP indicating that volatile organic compound (VOC) partition and sigal stransduction in these cases are non-specific processes. In the case of alcohols it was found that responses to branched primary,secondary and tertiary species generally correlate closely with the straight chain primary series,indicating that the sensors studied show little shape or size selectivity for non-homologous members of this analyte class. In the case of the polyalkylterthiophene material,the responses to heteroatom contaning aromatic compounds di dnot correlate closely with hydrocarbon-only aromatics,suggesting the occurrence of selective pi-pi inteactions. The apparent sensitivity order followed alcohols>esters>aromatics approx=alkanes,which is consistent with broad trends inanalyte polarity.
机译：进行了系统的研究，研究了各种导电聚合物气体传感器对34种挥发性有机化学物质（包括醇，酯，芳烃和烷烃）的稳态电阻响应。传感器由烷基取代的聚吡咯和聚烷基对噻吩;聚（3'，3“-二癸基-2,2”; 5'，2“-对噻吩）掺杂各种共烯胺而制得。在理论上和实验上都对传感器响应9C_g0的固定幅度和分析物饱和蒸气压（SVP）进行了研究，研究类别中的同源嵌体显示出C_g和SVP之间的线性关系，表明在这些情况下挥发性有机化合物（VOC）的分配和信号传导对于醇类，发现对支链伯，仲和叔物种的反应通常与直链伯系列紧密相关，这表明所研究的传感器对非同源成员几乎没有形状或尺寸选择性在聚烷基对噻吩材料的情况下，对杂原子的芳香族化合物的响应并没有发现与仅含碳氢化合物的芳族化合物密切相关，这表明发生了选择性的pi-pi相互作用。表观灵敏度顺序依次为醇>酯>芳烃约=烷烃，这与分析物极性的广泛趋势一致。

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