Li Bo, Sauvé Genevieve, Iovu Mihaela C, Jeffries-El Malika, Zhang Rui, Cooper Jessica, Santhanam Suresh, Schultz Lawrence, Revelli Joseph C, Kusne Aaron G, Kowalewski Tomasz, Snyder Jay L, Weiss Lee E, Fedder Gary K, McCullough Richard D, Lambeth David N
Electrical and Computer Engineering Department, Chemistry Department, Robotics Institute, and Chemical Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
Nano Lett. 2006 Aug;6(8):1598-602. doi: 10.1021/nl060498o.
Regioregular polythiophene-based conductive copolymers with highly crystalline nanostructures are shown to hold considerable promise as the active layer in volatile organic compound (VOC) chemresistor sensors. While the regioregular polythiophene polymer chain provides a charge conduction path, its chemical sensing selectivity and sensitivity can be altered either by incorporating a second polymer to form a block copolymer or by making a random copolymer of polythiophene with different alkyl side chains. The copolymers were exposed to a variety of VOC vapors, and the electrical conductivity of these copolymers increased or decreased depending upon the polymer composition and the specific analytes. Measurements were made at room temperature, and the responses were found to be fast and appeared to be completely reversible. Using various copolymers of polythiophene in a sensor array can provide much better discrimination to various analytes than existing solid state sensors. Our data strongly indicate that several sensing mechanisms are at play simultaneously, and we briefly discuss some of them.
具有高度结晶纳米结构的区域规整聚噻吩基导电共聚物被证明作为挥发性有机化合物（VOC）化学电阻传感器的活性层具有巨大潜力。虽然区域规整聚噻吩聚合物链提供了电荷传导路径，但其化学传感选择性和灵敏度可以通过并入第二种聚合物以形成嵌段共聚物，或者通过制备具有不同烷基侧链的聚噻吩无规共聚物来改变。将这些共聚物暴露于多种VOC蒸汽中，这些共聚物的电导率根据聚合物组成和特定分析物而增加或降低。在室温下进行测量，发现响应迅速且似乎完全可逆。在传感器阵列中使用各种聚噻吩共聚物比现有的固态传感器能够更好地区分各种分析物。我们的数据有力地表明，几种传感机制同时起作用，我们简要讨论其中一些机制。
