Multifunctional dopamine-coated FeVO4 composites applied in supercapacitors and sensors for human motion, gas and light monitoring, and secure transmission of information

In recent years, with the rapid development of technologies and industries such as new energy, novel sensing, flexible electronics, and wearable devices, there is an urgent need to develop nanomaterials with enhanced properties to meet the increasingly stringent functional requirements in energy storage and multifunctional sensing applications. Herein, a preparation strategy is proposed using poly(dopamine)-coated FeVO 4 nanoparticles as the exclusive electrode material, following the concept of integrating sensing and energy storage. Within this innovative framework, the polydopamine coating enhances the electrical conductivity and increases the specific surface area, resulting in an area capacitance of 308 mF cm −2 . This study demonstrates not only the practical application of this composite material in gas sensing technology, which contributes to the accurate detection of ethanol and ammonia concentrations in the range of 1 to 100 ppm, but also the development of full-band visible light photoelectric sensors with a rapid response time of 4.5 s using carbon cloth. Additionally, self-supporting MXene membranes prepared by vacuum filtration and screen-printed electrode materials were used to develop pressure sensors with excellent permeability and a wide detection range of 1 kPa to 100 kPa, which are used to realize applications such as pulse detection, joint motion detection, sound detection, and information transmission. The data information is protected using chaotic encryption algorithms through a combination of pressure sensors and cloud-based technology, thus ensuring secure data transmission. This work demonstrates that composite materials exhibit great potential for multifunctional sensing as well as supercapacitors, and provides innovative ideas and technical support for the development of a new generation of smart systems.