Tunable Pressure Sensor of f-Carbon Dot-Based Conductive Hydrogel with Electrical, Mechanical, and Shape Recovery for Monitoring Human Motion,ACS Applied Materials & Interfaces

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Tunable Pressure Sensor of f-Carbon Dot-Based Conductive Hydrogel with Electrical, Mechanical, and Shape Recovery for Monitoring Human Motion
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-11-04 , DOI: 10.1021/acsami.0c16745
Benny Ryplida _{1,

2,

3} , Insik In _{3,

4} , Sung Young Park _{1,

2,

3}

Affiliation

The reversible volume memories of the inner structures of soft materials with controllable hydrophilic–hydrophobic balance have been widely recognized, for example, hydrogels used in pressure sensors. Mechanical stimuli, such as pressure, vibration, and tensile, may influence the deformation of the hydrogel while simultaneously changing the electronic signal. Here, we designed a hydrophobic carbon dot nanoparticle (f-CD) mixed with polyvinyl alcohol and catechol-conjugated chitosan to obtain a hydrogel suitable for pressure and vibration sensor applications. The hydrophobicity of loaded f-CD plays an important role in mechanical performance and electronic signal acquisition. It also affects the different rheological reversibility and shape recovery as an impact on the volume transition. These characteristics are influenced by the compactness, dimensional structure, and density of the fabricated hydrogel. As a result, hydrogels with high hydrophobicity have a stiff structure (shear modulus 8123.1 N·m^–2) compared to that of the hydrophilic hydrogel (ranging between 6065.7 and 7739.2 N·m^–2). Moreover, the mechanically dependent volume transition hydrogel affects the electronic resistivity (up to 17.3 ± 1.3%) and capacitance change (up to 145%) when compressed with different forces. The hydrogel with a controlled hydrophobic–hydrophilic inner structure shows a unique sensitivity and great potential for various applications in wearable electronic skins, real-time clinical health-care monitoring, and human–computer interactions.

中文翻译：

具有电动，机械和形状恢复功能的基于f-碳点的导电水凝胶的可调压力传感器，用于监测人体运动

具有可控的亲水-疏水平衡的软材料内部结构的可逆体积记忆已得到广泛认可，例如，压力传感器中使用的水凝胶。机械刺激（例如压力，振动和拉伸）可能会影响水凝胶的变形，同时改变电子信号。在这里，我们设计了与聚乙烯醇和邻苯二酚共轭壳聚糖混合的疏水碳点纳米粒子（f -CD），以获得适用于压力和振动传感器应用的水凝胶。负载f的疏水性-CD在机械性能和电子信号采集中起重要作用。它还影响不同的流变可逆性和形状恢复，并影响体积转变。这些特性受制得的水凝胶的致密性，尺寸结构和密度的影响。结果，与亲水性水凝胶（介于6065.7和7739.2 N·m ^–2之间）相比，具有高疏水性的水凝胶具有坚硬的结构（剪切模量8123.1 N·m ^–2）。）。此外，当以不同的力压缩时，机械相关的体积过渡水凝胶会影响电子电阻率（最高17.3±1.3％）和电容变化（最高145％）。具有受控的疏水-亲水内部结构的水凝胶在可穿戴电子皮肤，实时临床医疗保健监控以及人机交互中的各种应用中显示出独特的敏感性和巨大潜力。

更新日期：2020-11-18

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