Jianpeng Wu,Haoming Pang,Li Ding,Yu Wang,Xiaokang He,Quan Shu,Shouhu Xuan,Xinglong Gong
Flexible sensors toward lightweight and miniaturization are significant for easy monitoring. Herein, an ultrathin (<40 μm, 19 g m −2 ) aramid-based flexible sensor is presented through expeditious inkjet printing and facile buckling strategy. Combining designable printing circuits with compressible buckled microstructures, the as-prepared sensor achieves excellent electrical response to external pressure without fussy preparation procedures and sophisticated facilities. The flexible sensor possesses sensitive subtle-pressure perception (38.4 Pa, 24 mg), remarkable mechanical durability (over 5500 cyclic compression and 4500 cyclic bending), as well as rapid response and recovery speed (20 ms). It can be conformably attached to skin/machine surfaces for continuous monitoring of physical signals originated from arterial pulses, human activities, and mechanical stimuli. As a digital printing process, conductive networks with different pixels are fully fabricated via inkjet printing to quantity pressure distribution. In addition, leveraging the hygroexpand-induced deformation of microstructures, the sensor can also discriminate the humidity-induced by multiple objects such as hand, cotton swab, and polyurethane sponge in a contactless fashion. Such a bimodal sensing system provides broad prospects for its applications in contact and noncontact perception platforms as a promising candidate for burgeoning portable electronic devices.
Electronic skin (e-skin), a new generation of flexible electronics, has drawn interest in soft robotics, artificial intelligence, and biomedical devices. However, most existing e-skins involve complex preparation procedures and are characterized by single-sensing capability and insufficient scalability. Here, we report on a one-step strategy in which a thermionic source is used for the in situ molecularization of bacterial cellulose polymeric fibers into molecular chains, controllably constructing an ionogel with a scalable mode for e-skin. The synergistic effect of a molecular-scale hydrogen bond interweaving network and a nanoscale fiber skeleton confers a robust tensile strength (up to 7.8 MPa) and high ionic conductivity (up to 62.58 mS/cm) on the as-developed ionogel. Inspired by the tongue to engineer the perceptual patterns in this ionogel, we present a smart e-skin with the perfect combination of excellent ion transport and discriminability, showing six stimulating responses to pressure, touch, temperature, humidity, magnetic force, and even astringency. This study proposes a simple, efficient, controllable, and sustainable approach toward a low-carbon, versatile, and scalable e-skin design and structure–performance development.
危险品化学品经营许可证（带存储）