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Cellulose

, Volume 25, Issue 12, pp 7329–7340 | Cite as

Super-compressible, fatigue resistant and anisotropic carbon aerogels for piezoresistive sensors

  • Meng Wang
  • Changyou Shao
  • Sukun Zhou
  • Jun Yang
  • Feng Xu
Original Paper
  • 115 Downloads

Abstract

Carbon aerogels combining excellent mechanical performance and conductivity have been increasingly developed for various applications. However, most carbon aerogels are unable to meet requirements for compressibility and fatigue resistance, greatly restricting their applications as strain sensors. Here we apply the bidirectional freezing technique to fabricate graphene and nanocellulose carbon aerogels with the hierarchical structure and oriented pores. The regular architecture combined with the synergistic effect of graphene and cellulose carbon nanofibers make the carbon aerogels reveal a series of mechanical properties, including a high compressibility up to 90%, and high fatigue resistance with a plastic deformation of 8.2% at 50% strain after 10,000 cycles. Moreover, the obtained carbon aerogel exhibits a low density of 3.26 mg cm−3 and the high electrical conductivity of 0.32 S m−1. Considering the high compressibility, superior fatigue resistant and high electrical conductivity, the carbon aerogels are assembled to make flexible strain sensors with high sensitivity of 0.26 kPa−1. The sensor was used to make a pedometer (walking step counter) and accurately monitor human activity, demonstrating potential for use in wearable devices.

Graphical abstract

Keywords

Bidirectional freezing process Celluloses Graphene oxide Piezoresistive sensors 

Notes

Acknowledgments

This work was supported by the National Key Research and Development Program of China (2017YFD0601004), State Key Laboratory of Pulp and Paper Engineering (201750), and National Natural Science Foundation of China (21404011, 21674013).

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest.

Supplementary material

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Supplementary material 1 (AVI 10143 kb)
10570_2018_2080_MOESM2_ESM.avi (1.7 mb)
Supplementary material 2 (AVI 1720 kb)
10570_2018_2080_MOESM3_ESM.docx (3.5 mb)
Supplementary material 3 (DOCX 3559 kb)

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Beijing Key Laboratory of Lignocellulosic ChemistryBeijing Forestry UniversityBeijingChina
  2. 2.State Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouChina

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