Stretchable and Highly Sensitive Strain Sensor Based on a 2D MXene and 1D Whisker Carbon Nanotube Binary Composite Film

Abstract

We fabricate a 2D MXene and 1D whisker carbon nanotube (WCNT) binary composite, where the MXene layer was sandwiched between two WCNT films, and assemble a flexible resistive-type strain sensor using this composite film. The deformations of the conductive networks trigged by the external mechanical stimuli cause the variations of the number of effective conductive paths, which result in the changes of the electric resistance of composite films. The resistances of the MXene/WCNT composite films that carry the strain information about the external mechanical stimuli are monitored. In addition, we demonstrate the role of the conductive MXene networks and the WCNT networks in responding to the external mechanical stimuli. The MXene networks dominate the variations of the resistance of the strain sensors in the low strain range. In the middle strain range, the deformations of both the MXene networks and the WCNT networks are responsible for the variations of the resistance of the strain sensors. In the high strain range, an “island bridge” like conductive network forms, where MXenes act as islands and WCNTs connect the adjacent MXene islands like bridges. The multiple types of conductive networks lead to the high sensitivity of the MXene/WCNT-based strain sensors over a wide strain range and a wide response window. This stretchable strain sensor exhibits good performances in detecting human muscle motions with a wide strain range and has the potentials of being applicable to wearable electronics.

Stretchable MXene/Carbon Nanotube Bilayer Strain Sensors with Tunable Sensitivity and Working Ranges

“…The sensitivity of the bilayer sensor is directly influenced by the MXene loading, suggesting an optimal selection for the target strain to boost the resistance changes. Compared with reported MXene/CNT nanocomposite strain sensors, our devices demonstrate competitive sensitivities and working ranges, as shown in Table S1, ,,,− illustrating the advantage of the bilayer design to achieve optimal performances.…”

Performance analysis of solution-processed nanosheet strain sensors—a systematic review of graphene and MXene wearable devices

“…The second form of nanocomposite to be analysed are layer deposition or coated nanocomposites. For these materials, nanosheet colloidal suspensions are drop-cast [176][177][178][179][180][181][182][183][184], dip-coated [185][186][187][188][189][190][191][192][193][194][195][196], spread coated [197], spray coated [198][199][200][201], spin coated [202] or screen printed [203][204][205][206] onto a flexible substrate or scaffold. Generally, the substrates are heated during these processes to facilitate solvent evaporation and allow for thin percolative networks of nanosheets to evenly form.…”