Laser-reduced graphene oxide for a flexible liquid sliding sensing surface

Abstract

Flexible electronic skin is a flexible sensor system that imitates human skin. Recently, flexible sensors have been successfully developed. However, the droplet sliding sensing technology on a flexible electronic skin surface is still challenging. In this Letter, a flexible droplet sliding sensing surface is proposed and fabricated by laser-reduced graphene oxide (LRGO). The LRGO shows porous structures and low surface energy, which are beneficial for infusing lubricants and fabricating stable slippery surfaces. The slippery surface guarantees free sliding of droplets. The droplet sliding sensing mechanism is a combination of triboelectricity and electrostatic induction. After a NaCl droplet slides from lubricant-infused LRGO, a potential difference (∼0.2 mV) can be measured between two Ag electrodes. This study reveals considerable potential applications in intelligent robots and the medical field.

Hygroelectric Generator Based on Antisymmetric Modification of Graphene Spheres with Ionic Hydrogels

“…To verify the authenticity of the principle, the surface ζ potential of graphene was tested, and the test results are shown in Figure c. The surface ζ potential of graphene is −19 mV, which is consistent with previous reports based on graphene materials. , In addition, 0.5 mL of deionized water was added to the left and right sides of the device to study the change of the electrical signal output of the device. The test results are shown in Figure d.…”

“…Based on the above analysis, the introduction of PVA and NaCl creates asymmetries of structure and water/ion concentration inside the device, and the water-locking effect of PVA−NaCl further delays the gradient collapse time of the device. 38,39 In addition, 0.5 mL of deionized water was added to the left and right sides of the device to study the change of the electrical signal output of the device. The test results are shown in Figure 4d.…”