Super-elastic and multifunctional graphene aerogels with multilayer cross-linked pore structure for dynamic force sensing arrays

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL Carbon Pub Date : 2025-02-10 DOI:10.1016/j.carbon.2025.120105

Wenting Zhang, Shilin Liu, Xiaoyu Liang, Jingzong He, Yonggen Lu, Qilin Wu

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Abstract

Multifunctional pressure sensing aerogels are essential for flexible wearable devices, and the microstructure directly affects the macroscopic properties of the aerogels. To obtain the graphene aerogel with a multilayer cross-linked pore structure, the aerogel skeleton was constructed using the foam template method and the compression annealing graphene aerogel (CAGA) was further fabricated via the compression annealing process. Finally, the thermoplastic polyurethane composite graphene aerogel (TPU/CAGA) was successfully obtained, endowing it with excellent comprehensive properties. The TPU/CAGA exhibited high electrical conductivity of 26.4 S/m and exceptional super-elasticity. The pressure sensor based on TPU/CAGA demonstrated high sensitivity (12.5 kPa⁻¹), making it suitable for the detection of human physiological signals. Excitingly, the sensor array based on TPU/CAGA can perceive the direction and magnitude of the dynamic force in combination with the time dimension, and can present significantly different resistance signals for forces with different moving trajectories, realizing the recognition of writing traces. Additionally, its outstanding Joule heating performance and electromagnetic shielding property meet the requirements for multifunctional applications in cold outdoor environments. This study proposes a simple and intriguing strategy for pressure-sensing aerogel with significant application potential in the field of wearable devices.

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具有多层交联孔结构的超弹性多功能石墨烯气凝胶用于动态力传感阵列

多功能压力传感气凝胶是柔性可穿戴设备必不可少的材料，其微观结构直接影响到气凝胶的宏观性能。为了获得具有多层交联孔结构的石墨烯气凝胶，采用泡沫模板法构建气凝胶骨架，并通过压缩退火工艺进一步制备了压缩退火石墨烯气凝胶（CAGA）。最后，成功制备了热塑性聚氨酯复合石墨烯气凝胶（TPU/CAGA），使其具有优异的综合性能。TPU/CAGA具有26.4 S/m的高电导率和优异的超弹性。基于TPU/CAGA的压力传感器灵敏度高（12.5 kPa - 1），适合检测人体生理信号。令人兴奋的是，基于TPU/CAGA的传感器阵列可以结合时间维度感知动态力的方向和大小，并且对于不同运动轨迹的力可以呈现明显不同的阻力信号，实现对书写轨迹的识别。此外，其出色的焦耳加热性能和电磁屏蔽性能满足在寒冷室外环境下的多功能应用要求。本研究提出了一种简单而有趣的压力传感气凝胶策略，在可穿戴设备领域具有重要的应用潜力。

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.