Ti3C2Tx MXene-graphene composite films for wearable strain sensors featured with high sensitivity and large range of linear response. (December 2019)

• Record Type: Journal Article
• Authors: Yang, Yina; Cao, Zherui; He, Peng; Shi, Liangjing; Ding, Guqiao; Wang, Ranran; Sun, Jing
• Is Part Of: Nano energy. Volume 66(2019)
• Publication Date: 2019-12
• Subjects: Strain sensors -- Layered structure -- Ti3C2Tx -- Multilayer graphene -- Linear response; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2019.104134
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Strain sensors featured with high sensitivities and large ranges of linear responses are currently under urgent needs. Herein, we present a spontaneously formed Ti3 C2 Tx /graphene/PDMS layered structure, which can be divided into two layers when being stretched: a Ti3 C2 Tx dominated brittle upper layer and a flexible graphene/PDMS composite bottom layer. The balance between the destruction and maintenance of the conductive pathways through the synergetic motion of the upper and bottom layers ensure a high and steady gauge factor of the senor in a wide strain range (e.g., gauge factors of 190.8 and 1148.2 in strain ranges of 0–52.6% and 52.6–74.1%, respectively). The Ti3 C2 Tx /graphene/PDMS layered structure based strain sensor is also featured with a low detection limit (~0.025%), a high linearity (R 2 > 0.98), a high cycling stability (over 5000 cycles), and an accurate monitoring of full-range human motions. Different breathing patterns in yoga are distinguished to demonstrate the practicability of the sensor. Graphical abstract: A strain sensor based on the Ti3 C2 Tx /graphene/PDMS layered structure is divided into two layers when being stretched. The upper layer mainly composed of Ti3 C2 Tx particles generates cracks to improve sensitivity, while the bottom graphene/PDMS layer always maintains the conductivity to enhance stretchability. The sensor exhibits a high GF of 190.8–1148.2 within 0–74.1% with good linearity. Image 1 Highlights: The MXene-graphene based strain sensor exhibited a high sensitivity and a wide strain range of linear response. Ti3 C2 Tx /graphene/PDMS layered structure can be spontaneously formed by vacuum filtration and prepolymerization. The Ti3 C2 Tx /graphene/PDMS layered structure can be divided into two layers during the stretching process.