Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (02): 61-68.doi: 10.13475/j.fzxb.20211100908

• Fiber Materials • Previous Articles     Next Articles

Preparation and performance of high sensitive ultra-compressed bio-based carbonized flexible pressure sensor

LIN Meixia1,2, WANG Jiawen1, XIAO Shuang1,2, WANG Xiaoyun1, LIU Hao1,2, HE Yin1,2()   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. Institute of Smart Wearable Electronic Textiles, Tiangong University, Tianjin 300387, China
  • Received:2021-11-02 Revised:2021-12-02 Online:2022-02-15 Published:2022-03-15
  • Contact: HE Yin E-mail:heyin@tiangong.edu.cn

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Abstract:

In order to obtain flexible mechanical sensors with high sensitivity, wide response range and environment-friendliness, the top-down carbonized wood technology was adopted to prepare polyurethane/carbonized wood aerogel composite conductive materials, with balsa fir as the base material. The compression and resilience of the carbonized materials were improved by soaking the materials in polyurethane. Scanning Electronic microscopy and other instruments were used to characterize the apparent structure, thermal stability, mechanical and electrical properties of wood aerogels before and after carbonization, as well as the sensing properties of flexible pressure sensors. The results show that the carbonized wood aerogel has a unique three-dimensional arched layer structure with a porosity of 55.73% and high thermal stability and compressibility. The 4% polyurethane/wood carbide aerogels have demonstrated good sensing properties, with the sensitivity being 61.02 kPa-1, the hysteresis less than 4.87%, and the repeatability 10 000 cycles under the wide detection limit of 1-60 kPa. The flexible pressure sensor based on the aerogel can be used to monitor physiological signals and human movement behavior.

Key words: bio-based carbonized material, flexible pressure sensor, carbonized wood aerogel, thermoplastic polyurethane, porous material

CLC Number: 

  • TP212.2

Fig.1

Schematic diagram of preparation method of flexible pressure sensor based on TPU/carbonized wood aerogel"

Fig.2

SEM images at different stages. (a) Natural wood block; (b) Wood aerogel; (c) Carbonized wood aerogel"

Fig.3

TPU/carbonized wood aerogel skeleton and pore structure. (a) Skeleton 3-D image and skeleton section image; (b) Pore 3-D image and pore section image"

Fig.4

TGA curve before and after carbonization of aerogel"

Tab.1

Compression perfor mance of different materials"

压缩材料 压缩前
高度/cm		 压缩后
高度/cm		 压缩应
变/%
天然木块 1.20 0.879 26.7
聚氨酯/炭化
木气凝胶		 1.00 0.122 87.8

Fig.5

Stress-strain curve of carbonized wood aerogel at different TPU concentrations"

Fig.6

Relative resistance change rate of 2%, 4%, 6% TPU/carbonized wood aerogel"

Fig.7

Relative resistance change rate of 2%, 4% 6%, TPU/carbonized wood aerogel during load-unload cycles"

Fig.8

Repeatability of 4% TPU/carbonized wood aerogel"

Fig.9

Application of flexible pressure sensor in monitoring physiological signals of human body. (a) Throat phonation monitoring; (b) Monitoring of different respiratory states"

Fig.10

Human motion monitoring using flexible pressure sensors. (a) Finger flexion monitoring; (b) Knee flexion monitoring; (c) Elbow flexion monitoring; (d) Wrist flexion monitoring"

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