Details

Autor(en) / Beteiligte

• Zhai, Yue
• Yu, Yunfei
• Zhou, Kangkang
• Yun, Zhigeng
• Huang, Wenju
• Liu, Hu
• Xia, Quanjun
• Dai, Kun
• Zheng, Guoqiang
• Liu, Chuntai
• Shen, Changyu

Titel

Flexible and wearable carbon black/thermoplastic polyurethane foam with a pinnate-veined aligned porous structure for multifunctional piezoresistive sensors

Ist Teil von

• Chemical engineering journal (Lausanne, Switzerland : 1996), 2020-02, Vol.382, p.122985, Article 122985

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Quelle

ScienceDirect

Beschreibungen/Notizen

• [Display omitted] •A flexible CB/TPU foam with a pinnate-veined aligned porous structure was prepared.•The foam can both serve as a flexible strain sensor and an adsorption material.•The foam sensor has excellent sensing discernibility and high sensitivity.•The sensor exhibits superior response stability in a wide sensing range. In this paper, flexible conductive carbon black (CB)/thermoplastic polyurethane (TPU) foam (CTF) with an intriguing pinnate-veined aligned porous structure was fabricated via a unidirectional freeze-drying process. The density, porosity and average pore size of the composite foam are 0.13 g cm−3, 83.7% and 24.9 μm, respectively. CB particles are uniformly dispersed in the skeleton of the as-prepared foam, resulting in a low percolation threshold of 0.48 vol%. The CTF is capable of distinguishing different compressive strain by change of the relative resistance. Its responsive behaviors towards compressive strain present an excellent linear characteristic with a high gauge factor (GF) up to 1.55. In the piezoresistive tests, the CTF shows a fast response/relaxation time (150/150 ms), fascinating recoverability, excellent response stability within a wide workable detection range up to 80% strain (corresponding pressure of 584.4 kPa) and a superior durability (>10000 cycles), which is mainly related to the pinnate-veined aligned porous structure along the orientation direction. The CTF was then assembled as a wearable sensor to monitor various human motions such as arm bending, squatting, tiptoeing, etc., showing good detection performances. The sensor can also deal with water pollution through oil/water separation, suggesting its multifunctionality and promising prospects in complicated situations.