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首页> 外文期刊>Advanced Functional Materials >When Nanoparticles Meet Poly(Ionic Liquid)s: Chemoresistive CO2 Sensing at Room Temperature
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When Nanoparticles Meet Poly(Ionic Liquid)s: Chemoresistive CO2 Sensing at Room Temperature

机译：当纳米粒子遇到聚离子液体时：室温下的化学电阻式CO2传感

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摘要

Tetraalkylammonium-based poly(ionic liquid)s (PILs) are able to absorb particularly large amounts of CO2; thus are considered up-and-coming materials in applications ranging from sensing, separation, to storage of CO2. To meet the requirements of practical usage, their chemical activity has to be combined with other functionalities, for example, by fabricating composite materials. Poly[(p-vinylbenzyl) trimethylammonium hexafluorophosphate] and La2O2CO3 nanoparticles-both of which are intrinsically insulating materials-are utilized as building blocks, taking full advantage of the electrostatic interaction at their interface to boost the overall conductivity of composites at room temperature. To rationalize this unique behavior, the charge transport mechanism is studied using impedance spectroscopy. It is found find that, for the composites with La2O2CO3 content of 60-80 wt%, the interfacial effect becomes dominant and leads to the formation of conduction channels with increased mobility of [PF6]-anions. These composites show further increase of the conductivity when exposed to pulses of CO2 between 150 and 2400 ppm at room temperature in a relative humidity of 50%. This work therefore provides a simple strategy to achieve an enhancement of the electrical properties required for the utilization of PILs-based CO2 sensors, but in the future this concept can be easily extended to other electronic devices.
机译：基于四烷基铵的聚离子液体（PIL）能够吸收特别大量的CO2。因此被认为是从传感，分离到二氧化碳存储等应用中的新兴材料。为了满足实际使用的要求，它们的化学活性必须与其他功能结合，例如通过制造复合材料。聚[（对乙烯基苄基）三甲基铵六氟磷酸酯]和La2O2CO3纳米颗粒（本质上都是绝缘材料）被用作结构单元，充分利用了它们在界面处的静电相互作用来提高复合材料在室温下的整体导电性。为了合理化这种独特行为，使用阻抗谱研究了电荷传输机制。发现发现，对于La 2 O 2 CO 3含量为60-80wt％的复合材料，界面效应变得占优势并且导致形成具有增加的[PF 6]-阴离子迁移率的导电通道。这些复合材料在室温和50％的相对湿度下暴露于150至2400 ppm的CO2脉冲时，其导电性进一步提高。因此，这项工作提供了一种简单的策略，可以提高使用基于PIL的CO2传感器所需的电性能，但是在将来，该概念可以轻松地扩展到其他电子设备。

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  • 来源
    《Advanced Functional Materials》 |2015年第17期|2537-2542|共6页
  • 作者

    Willa Christoph; Yuan Jiayin; Niederberger Markus; Koziej Dorota;

  • 作者单位

    Swiss Fed Inst Technol, Dept Mat, Lab Multifunct Mat, CH-8093 Zurich, Switzerland;

    Max Planck Inst Colloids & Interfaces, D-14476 Golm, Germany;

    Swiss Fed Inst Technol, Dept Mat, Lab Multifunct Mat, CH-8093 Zurich, Switzerland;

    Swiss Fed Inst Technol, Dept Mat, Lab Multifunct Mat, CH-8093 Zurich, Switzerland;

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