Effect of silica aerogel incorporation on electrical characteristics and strain-sensing capability of nano-porous CNT/PDMS sensors

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Polymer Testing Pub Date : 2024-08-01 DOI:10.1016/j.polymertesting.2024.108534

Daeik Jang , Ermias Shimelis , Jae Won Kim , Sejin Kim , Young-Kwan Kim , Beomjoo Yang

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Abstract

The present study focuses on investigating the effect of incorporating silica aerogel on the electrical characteristics and sensing capabilities of carbon nanotube (CNT)-embedded PDMS nanocomposites. Initially, the concept of developing nanohybrid clusters composed of CNT and silica aerogel was introduced, followed by comprehensive evaluations of their formation including zeta potential, Raman spectra and FT-IR spectrum. Subsequently, the nanocomposites with varied silica aerogel contents from 0.5 to 2 % by polymer mass were assessed for their sensing capability. It is observed that porosity has exerts perceptible influence on the overall effective electrical conductivity of the sensor below the percolation thresholds, while it does not have any impact beyond this threshold. In addition, the effective medium proposition theory has been modified to analyze both the effective electrical conductivity and the piezoelectric properties of the sensors fabricated. Based on the theoretical and experimental results, the developed CNT@aerogel nanohybrid clusters displayed the potential to enhance sensing sensitivity and increase linearity during stretching condition.

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加入二氧化硅气凝胶对纳米多孔 CNT/PDMS 传感器电气特性和应变传感能力的影响

本研究的重点是探讨加入二氧化硅气凝胶对嵌入碳纳米管（CNT）的 PDMS 纳米复合材料的电气特性和传感能力的影响。首先介绍了开发由碳纳米管和二氧化硅气凝胶组成的纳米杂化团簇的概念，然后对其形成进行了全面评估，包括ZETA电位、拉曼光谱和傅立叶变换红外光谱。随后，评估了不同二氧化硅气凝胶含量（聚合物质量的 0.5% 至 2%）的纳米复合材料的传感能力。结果表明，在渗流阈值以下，孔隙率对传感器的整体有效电导率有明显的影响，而在阈值以上则没有任何影响。此外，还修改了有效介质命题理论，以分析所制造传感器的有效电导率和压电特性。根据理论和实验结果，所开发的 CNT@aerogel 纳米杂化团簇具有在拉伸条件下提高传感灵敏度和线性度的潜力。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.