Polymer-Free Graphene Oxide/MXene Composite Flexible Pressure Sensor With Ultrawide Temperature Resistance Range and Outstanding Sensitivity

The rising demand for lightweight and flexible pressure sensors with sensitive sensing capabilities and resistance to high temperatures is evident across various applications. However, effectively integrating these advantages in a harmonious manner poses a significant challenge. Here, an ultralight graphene oxide (GO)/MXene aerogel with low density (19 mg/cm³) has been fabricated, demonstrating excellent temperature resilience ranging from −55 ^◦C to 300 ^◦C. The flexible piezoresistive sensor is developed utilizing a simple vacuum freeze-drying method. The as-obtained flexible pressure sensor exhibits a notable sensitivity of 62.65 kPa⁻¹, a rapid response time of 55 ms, a wide detection range of 0.2 Pa–23 kPa, and commendable durability verified by over 5000 loaded–unloaded cycles (up to 40% strain). The sensor can detect human movements, including wrist bending, fingerpicking, swallowing, and blowing. It has exhibited exceptional pressure sensing capabilities over a wide range from −55 ^◦C to 300 ^◦C. The proposed polymer-free aerogel is anticipated to exhibit a broad range of temperature resistance, enhancing its potential for future applications such as energy storage and aerospace.