Facile Fabrication of Conductive Graphene/Polyurethane Foam Composite and Its Application on Flexible Piezo-Resistive Sensors

Polymers

Dong Wang¹  Ashish Yadav¹  Mingze Bao¹  Weixin Li¹  Weibing Zhong²  Yuanli Chen³  Chengyandan Shen³  Xincheng Ding³  Haiqing Jiang³ 

[1] Application, Wuhan Textile University, Wuhan 430200, China;College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China;;Hubei Key Laboratory of Advanced Textile Materials &

关键词: reduced graphene oxide;    polyurethane foam;    flexible electronics;    pressure sensing;   

DOI  :  10.3390/polym11081289

来源: DOAJ

【 摘 要 】

Flexible pressure sensors have attracted tremendous research interests due to their wide applications in wearable electronics and smart robots. The easy-to-obtain fabrication and stable signal output are meaningful for the practical application of flexible pressure sensors. The graphene/polyurethane foam composites are prepared to develop a convenient method for piezo-resistive devices with simple structure and outstanding sensing performance. Graphene oxide was prepared through the modified Hummers method. Polyurethane foam was kept to soak in the obtained graphene oxide aqueous solution and then dried. After that, reduced graphene oxide/polyurethane composite foam has been fabricated under air phase reduction by hydrazine hydrate vapor. The chemical components and micro morphologies of the prepared samples have been observed by using FT-IR and scanning electron microscopy (SEM). The results predicted that the graphene is tightly adhered to the bare surface of the pores. The pressure sensing performance has been also evaluated by measuring the sensitivity, durability, and response time. The results indicate that the value of sensitivity under the range of 0−6 kPa and 6−25 kPa are 0.17 kPa⁻¹ and 0.005 kPa⁻¹, respectively. Cycling stability test has been performed 30 times under three varying pressures. The signal output just exhibits slight fluctuations, which represents the good cycling stability of the pressure sensor. At the same stage, the response time of loading and unloading of 20 g weight turned out to be about 300 ms. These consequences showed the superiority of graphene/polyurethane composite foam while applied in piezo-resistive devices including wide sensitive pressure range, high sensitivity, outstanding durability, and fast response.

【 授权许可】

Unknown