Bioinspired, Mechanically Robust Chemiresistor for Inline Volatile Organic Compounds Sensing
Bioinspired, Mechanically Robust Chemiresistor for Inline Volatile Organic Compounds Sensing
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生物启发，机械稳健的化学电阻器在线挥发性有机化合物传感
DOI：
10.1002/admt.202000440
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发表时间：
2020-08
影响因子：
6.8
通讯作者：
Weiheng Xu;Dharneedar Ravichandran;Sayli Jambhulkar;Rahul Franklin;Yuxiang Zhu;Kenan Song
中科院分区：
文献类型：
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作者：
Weiheng Xu;Dharneedar Ravichandran;Sayli Jambhulkar;Rahul Franklin;Yuxiang Zhu;Kenan Song
基于聚合物/纳米颗粒复合材料的挥发性有机化合物（VOC）传感器具有许多优点，例如高化学和物理稳定性、在极端条件下的可操作性、在制造中的灵活使用以及低成本。然而，由于厚度依赖性扩散，其检测下限限制了其应用。受维管植物中的后生木质部及其垂直管道和水平凹坑的启发，可以实现有效的蒸腾作用，制造了一种基于聚合物/纳米颗粒复合材料的传感器，该传感器具有可控的，自发形成的中空芯，用于在线VOC运输，以及用于径向扩散的多孔微结构。中空芯由内部多孔层（热塑性聚氨酯（TPU））、中间传感层（TPU/石墨烯纳米片/多壁碳纳米管）和外部机械耐用层（TPU）包围。与单层复合光纤传感器相比，这种多层结构显示出600%的高响应率，具有低检测限（例如，对于二甲苯，约15 ppm）和基于Flory-Huggins相互作用参数的高选择性。这种灵活和可拉伸的传感器还展示了VOC浓度和单轴应变变形的双参数传感能力。通过一步纤维纺丝过程，这种自诱导中空纤维提供了一种独特的微结构设计方法，可以通过聚合物/纳米颗粒传感器检测低浓度VOC。
There are advantages to polymer/nanoparticle composite‐based volatile organic compounds (VOCs) sensors, such as high chemical and physical stability, operability under extreme conditions, flexible use in manufacturing, and low cost. Nevertheless, their lower limit of detection due to thickness‐dependent diffusion has constrained their application. Inspired by the metaxylem in vascular plants and its vertical conduits and horizontal pits that enable efficient transpiration, a polymer/nanoparticle composite‐based sensor is fabricated with a controllable, spontaneously formed, hollow core for inline VOCs transportation, and porous microstructure for radial direction diffusion. The hollow core is surrounded by an inner porous layer (thermoplastic polyurethane (TPU)), a middle sensing layer (TPU/graphene nanoplatelets/multiwalled carbon nanotubes), and an outer mechanically durable layer (TPU). This multilayered structure shows a 600% higher response rate compared to a single‐layered composite fiber sensor, with a low limit of detection (e.g., ≈15 ppm for xylene) and high selectivity based on the Flory–Huggins interaction parameter. This flexible and stretchable sensor also demonstrates a dual parameter sensing capability from VOC concentrations and uniaxial strain deformation. Via a one‐step fiber spinning procedure, this self‐induced hollow fiber offers a unique method of microstructural design, which enables the detection of low‐concentration VOCs by polymer/nanoparticle‐based sensors.