高灵敏、可穿戴生物质炭基柔性压力传感材料的制备与性能研究

Preparation of sensitive and wearable biochar-based flexible pressure-sensing materials and study on their performance

杜仲残渣(EUR)是杜仲胶提取过程剩余的废弃物,是一种廉价、可再生、环境友好的资源,以其炭化物为导电材料、聚二甲基硅氧烷(PDMS)为柔性基质,制备了廉价、对人体友好的复合柔性压阻式传感材料,并对材料结构以及压敏性进行了表征,测试了该压力传感材料从0到14 k Pa的响应特性。结果表明,在0.3 k Pa应力下具有高的灵敏度(142.1 kPa^(-1)),所制备的CEUR/PDMS材料对应力变化响应稳定并具有良好的耐久性;该复合传感材料对手持不同质量烧杯、手机振动以及书写信号具有良好的响应。该复合材料制备工艺简单、成本低、响应性能优异且对人体无害,在可穿戴和监测人体活动等领域具有广泛的应用前景。

With the development of flexible pressure sensors in the field of wearable and human-computer interaction,the requirements for flexible pressure sensors are getting higher and higher. While ensuring high sensitivity characteristics,they also need to be bio-friendly and low-cost. The preparation methods of sensing materials based on biomass waste and high-elasticity polydimethylsiloxane( PDMS) materials are discussed,and their sensing properties are studied.Eucommia ulmoides residue( EUR) is a kind of waste from the extraction process of eucommia ulmoides gum.It is a cheap,renewable,and environmentally friendly resource. By using carbonized EUR as a conductive material and PDMS as a flexible substrate,a cheap and human-friendly composite flexible piezoresistive sensing material is prepared via a simple method,and its structure and pressure sensitivity are characterized by electrochemical workstation and other instruments.Results show that this pressure sensing material( CEUR/PDMS) has a working range of 0 to 14 k Pa and has a high sensitivity of 142. 1 k Pa-1 under 0. 3 k Pa stress. The prepared CEUR/PDMS material has a stable response to stress changes and has a good durability. Application tests show that it has a good response to holding water cups of different weights,phone vibration and writing signals.CEUR/PDMS material can be prepared by a simple process,has a low cost and excellent response performance and is harmless to human body,which is expected to have good application prospects in the fields of wearable and monitoring human activities.