Doping to graphene is essential for developing graphene-based electronic devices and circuits, while traditional doping methods to graphene are still challenging due to unstable doping characteristics and unavoidable damage to the graphene structure. Here, we demonstrate piezoionic-powered strain and touch sensors using mechanically doped graphene with solid polymer electrolyte (SPE). Due to the piezoionic effect in SPE, the Dirac point voltage of an SPE-coated graphene field-effect transistor (S-GFET) is shifted left/right upon compressive/tensile strain. This mechanical strain tuned piezoionic doping to graphene that enables to obtain different Dirac point voltage of S-GFET for a piezoionic-powered strain sensor. When the S-GFET acted as a strain sensor, the S-GFET exhibited stable output signals against to continuous strain and was able to distinguish between tension and compression without any additional components. The strain sensor mounted on a hand very effectively responded to the hand joint movement. Additionally, it was found that the device is also suitable for touch sensing due to the coupling of triboelectrification and the electronic transport in the S-GFET.

掺杂石墨烯对于开发基于石墨烯的电子设备和电路至关重要，而传统的石墨烯掺杂方法由于不稳定的掺杂特性和不可避免的对石墨烯结构的破坏而仍然具有挑战性。在这里，我们演示了使用机械掺杂的石墨烯与固体聚合物电解质（SPE）的压电驱动应变和触摸传感器。由于SPE中的压电效应，SPE涂层的石墨烯场效应晶体管（S-GFET）的Dirac点电压在压缩/拉伸应变时向左/向右移动。这种机械应变将压电离子掺杂调整为石墨烯，从而可以为压电驱动的应变传感器获得S-GFET的不同Dirac点电压。当S-GFET充当应变传感器时，S-GFET展现出稳定的输出信号以抵抗连续应变，并且能够在没有任何其他组件的情况下区分拉伸和压缩。安装在手上的应变传感器非常有效地响应了手关节的运动。另外，发现由于摩擦起电和S-GFET中的电子传输的耦合，该设备也适用于触摸感应。