Gradient Cu/Ti₃C₂T_x MXene-Coated Textile Pressure Sensor with High Sensitivity and a Wide Sensing Range

Abstract

As a fundamental component for health monitoring, human− machine interactions, and electronic skin, a flexible pressure sensor always faces the challenge of either a limited sensing range or inferior sensitivity. To overcome the trade-off between high sensitivity and a wide sensing range, here, we constructed a mass-gradient distribution of Cu onto a textile coated with Ti 3 C 2 T x nanosheets through an additive-assisted electrodeposition technique. The synergistic effects of the flexible and knitted structural textile substrate and the mass-gradient distribution of the as-deposited Cu gave a continuous change in not only the contact area but the conductivity of the contact points of the sensor under compressive loading. Thus, the sensor exhibited both a high sensitivity of up to 67.91 kPa −1 and a wide sensing range of 905 kPa, simultaneously. In addition, the sensor demonstrated excellent cycling stability after 1000 cyclic loadings, a fast response/recovery time of 30/50 ms, and excellent breathability, which endows it with wide applications, including monitoring human physiological signals, transmitting encrypted information, and distinguishing the spatial distribution of pressure in real time.

Recent progress in 2D textile-based piezoresistive strain and pressure sensors

“…Encapsulation with rubber materials like Ecoflex increases the sensor's stability [98] and stretchability [51]. As a method of achieving both high sensitivity and stretchability, an additive-assisted electrodeposition method was used to obtain gradient Cu on an MXene-coated textile [173]. While the gradient distribution of Cu changed the conductivity of the contact points, the flexible and knitted structural textile substrate provided a significant change in contact areas under compressive loading.…”

Co-sensitization of Copper Indium Gallium Disulfide and Indium Sulfide on Zinc Oxide Nanostructures: Effect of Morphology in Electrochemical Carbon Dioxide Reduction

“…Converting carbon dioxide (CO 2 ) into valuable chemicals and fuels has made an impact on reducing our carbon footprint. − However, the high stability of CO 2 for conversion into different chemicals restricts the application. Therefore, the research community has focused on developing materials and systems for efficient CO 2 conversion by reducing the high activation energy of CO 2 . − It is possible to achieve CO 2 reduction via various routes, including photocatalytic and electrochemical conversion. − In this way, besides decreasing carbon emissions, value-added chemicals, such as methanol, hydrogen, formic acid, and syngas, can be produced. − Among these chemicals, formic acid stands out as an alternative to fossil fuels due to its advantages, such as being an energy-intensive material, having a high volumetric hydrogen density, and having enormous potential as an effective hydrogen storage vector .…”