Design of an Ultrasensitive Flexible Bend Sensor Using a Silver-Doped Oriented Poly(vinylidene fluoride) Nanofiber Web for Respiratory Monitoring.,ACS Applied Materials & Interfaces

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Design of an Ultrasensitive Flexible Bend Sensor Using a Silver-Doped Oriented Poly(vinylidene fluoride) Nanofiber Web for Respiratory Monitoring.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-12-24 , DOI: 10.1021/acsami.9b18823
Lu Jin ₁ , Yan Zheng _{1,

2} , Zekun Liu ₁ , Jiashen Li ₁ , Heng Zhai ₁ , Zhongda Chen ₁ , Yi Li ₁

Affiliation

We propose a design strategy to fabricate a flexible bend sensor (BS) with ultrasensitivity toward airflow using all-poly(vinylidene fluoride) (PVDF) nanofiber web-based sensing elements and electrodes to monitor human respiration. The unique electrospinning (rotational speed of collector of 2000 rpm and tip-to-collector distance of 4 cm) with silver nanoparticle interfacing was introduced to prepare a Ag-doped oriented PVDF nanofiber web with high β-phase content as a sensing element (AgOriPVDF, β-phase crystallinity ∼44.5%). After that, a portion of the prepared AgOriPVDF was processed into a flexible and electrically conductive electrode through an electroless silver plating technique (SP-AgOriPVDF). Interestingly, the encapsulated AgOriPVDF BS with the SP-AgOriPVDF electrode exhibited superior piezoelectric bending response (open-circuit peak-to-peak output voltage, Vp-p ≈ 4.6 V) to injected airflow, which is more than 200 times higher than that of the unpackaged randomly aligned PVDF nanofiber web BS with a conductive tape electrode (Vp-p ≈ 0.02 V). In addition, the factors influencing the bend sensitivity of the BS such as the β-phase content, nanofiber orientation, flexibility of the electrode, and so forth were thoroughly analyzed and then discussed. We also demonstrated that the AgOriPVDF BS has sufficient capability to detect and identify various respiratory signals, presenting a great potential for wearable applications, for example, smart respiratory protective equipment.

中文翻译：

使用掺杂银的聚偏二氟乙烯纳米纤维网对呼吸监测的超灵敏弯曲传感器的设计。

我们提出一种设计策略，以使用基于全聚偏二氟乙烯（PVDF）纳米纤维网的传感元件和电极来监测人体呼吸的柔性，来制造对气流具有超敏感性的柔性弯曲传感器（BS）。引入了独特的静电纺丝技术（集电极的转速为2000 rpm，针尖到集电极的距离为4 cm），以银纳米颗粒为界面，以制备具有高β相含量的Ag掺杂取向PVDF纳米纤维网作为传感元件（AgOriPVDF ，β-相结晶度〜44.5％。之后，通过化学镀银技术（SP-AgOriPVDF）将一部分制备的AgOriPVDF加工成柔性导电电极。有趣的是，带有SP-AgOriPVDF电极的封装AgOriPVDF BS对注入的气流表现出优异的压电弯曲响应（开路峰峰值输出电压，Vp-p≈4.6 V），是未包装电极的200倍以上用导电带电极（Vp-p≈0.02 V）随机排列的PVDF纳米纤维网BS。另外，对影响BS弯曲敏感性的因素，如β相含量，纳米纤维取向，电极的柔韧性等进行了详尽的分析和讨论。我们还证明了AgOriPVDF BS具有足够的能力来检测和识别各种呼吸信号，这为可穿戴应用（例如智能呼吸防护设备）提供了巨大的潜力。其比具有导电带电极（Vp-p≈0.02 V）的未包装的随机排列的PVDF纳米纤维网BS高200倍以上。另外，对影响BS弯曲敏感性的因素，如β相含量，纳米纤维取向，电极的柔韧性等进行了详尽的分析和讨论。我们还证明了AgOriPVDF BS具有足够的能力来检测和识别各种呼吸信号，这为可穿戴应用（例如智能呼吸防护设备）提供了巨大的潜力。其比具有导电带电极（Vp-p≈0.02 V）的未包装的随机排列的PVDF纳米纤维网BS高200倍以上。另外，对影响BS弯曲敏感性的因素，如β相含量，纳米纤维取向，电极的柔韧性等进行了详尽的分析和讨论。我们还证明了AgOriPVDF BS具有足够的能力来检测和识别各种呼吸信号，这为可穿戴应用（例如智能呼吸防护设备）提供了巨大的潜力。对电极的柔韧性等进行了彻底的分析，然后进行了讨论。我们还证明了AgOriPVDF BS具有足够的能力来检测和识别各种呼吸信号，这为可穿戴应用（例如智能呼吸防护设备）提供了巨大的潜力。对电极的柔韧性等进行了彻底的分析，然后进行了讨论。我们还证明了AgOriPVDF BS具有足够的能力来检测和识别各种呼吸信号，这为可穿戴应用（例如智能呼吸防护设备）提供了巨大的潜力。

更新日期：2019-12-25

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