Highly sensitive and flexible strain sensor based on AuNPs/CNTs’ synergic conductive network
Strain sensor is widely desired for flexible and wearable electronic devices, such as human motion capturing and electronic skin. In strain sensing, it is a challenge to ensure that the strain sensor based on CNTs–PDMS has both high-performance flexibility and sensitivity. Here, this study reports a flexible strain sensor based on the AuNPs/CNTs/PDMS composite films fabricated by in-situ reduction, which has high sensitivity and wide linear strain range. DFT revealed that the AuNPs effectively improved the conductivity of the composite films, which show high consistency with electrical test. The AuNPs synergistically improved the sensitivity and flexibility of strain sensors with CNTs in PDMS. The flexible strain sensors with 3 wt% CNTs and 16 h AuNPs’ reduction time have the higher gage factor of 366.7 at a linear strain ranging from 0 to 15%. We demonstrated the applicability of our high-performance strain sensors by testing the tiny motion sensing caused by wrist bending, finger bending, wrist raising, neck rotation, and facial muscle movement. The AuNPs/CNTs/PDMS composite film with high sensitivity, flexible, and stability provides a new elastomer nanocomposite as strain sensor for strain-sensing applications.
KeywordsAuNPs/CNTs/PDMS In-situ reduction method Flexible strain sensor High sensitivity Human motion detection
The authors are grateful for the support by the National Natural Science Foundation of China (nos. 51622507, 61471255, 61703298, 61474079, and 51705354), Basic Research Program of Shanxi for Youths (nos. 201701D221110 and 2015021092), Excellent Talents Technology Innovation Program of Shanxi Province of China (no. 201605D211023), and 863 project (no. 2015AA042601).
Compliance with ethical standards
Conflict of interest
The authors declare no conflict of interest.
- Azhari S, Yousefi AT, Tanaka H, Khajeh A, Kuredemus N, Bigdeli MM, Hamidon MN (2017) Fabrication of piezoresistive based pressure sensor via purified and functionalized CNTs/PDMS nanocomposite: toward development of haptic sensors. Sens Actuators A 266:158–165. https://doi.org/10.1016/j.sna.2017.09.026 Google Scholar
- Deng B, Hsu PC, Chen G, Chandrashekar BN, Liao L, Ayitimuda Z, Aisijiang M (2015) Roll-to-roll encapsulation of metal nanowires between graphene and plastic substrate for high-performance flexible transparent electrodes. Nano Lett 15:4206–4213. https://doi.org/10.1021/acs.nanolett.5b01531 Google Scholar
- Kurth S, Perdew JP, Blaha P (1999) Molecular and solid-state tests of density functional approximations: LSD, GGAs, and meta-GGAs. Int J Quantum Chem 75:889–909. https://doi.org/10.1002/(SICI)1097-461X(1999)75:4/5%3C889::AID-QUA54%3E3.0.CO;2-8.Google Scholar
- Leszczyńska A, Njuguna J, Pielichowski K, Banerjee JR (2007) Polymer/montmorillonite nanocomposites with improved thermal properties: part II. Thermal stability of montmorillonite nanocomposites based on different polymeric matrixes. Thermochim Acta 4541:1–22. https://doi.org/10.1016/j.tca.2006.11.003 Google Scholar
- Zheng Y, Li Y, Li Z, Wang Y, Dai K, Zheng G, Shen C (2017a) The effect of filler dimensionality on the electromechanical performance of polydimethylsiloxane based conductive nanocomposites for flexible strain sensors. Compos Sci Technol 139:64–73. https://doi.org/10.1016/j.compscitech.2016.12.014 Google Scholar
- Zheng Y, Li Y, Dai K, Liu M, Zhou K, Zheng G, Shen C (2017b) Conductive thermoplastic polyurethane composites with tunable piezoresistivity by modulating the filler dimensionality for flexible strain sensors. Compos Part A Appl Sci 101:41–49. https://doi.org/10.1016/j.compositesa.2017.06.003 Google Scholar