凯发

Here, we developed a transparent and stretchable all-graphene multifunctional E-skin sensor matrix. Three different functional sensors were included in this matrix: humidity, thermal, and pressure sensors, and were judiciously integrated into a layer-by-layer geometry through a simple lamination process. CVD-grown graphene was used to form the electrodes and interconnects for these three sensors, whereas GO and rGO were used as the active sensing materials for the humidity and temperature sensors, respectively. The top polydimethylsiloxane (PDMS) substrate, which bore the GO humidity sensor array, was laminated in a crisscross fashion onto the top of the bottom PDMS substrate, which bore the rGO temperature sensor array. The arrays were prepared to have the same geometry. The top PDMS substrate sandwiched between two CVD-graphene electrodes acted as an active layer for the capacitive pressure and strain sensors. Together, the sensors monitored a variety of daily life sensations (e.g., a hot wind blowing, breathing, and finger touching) with excellent sensitivity. Each sensor in the matrix exhibited simplex sensing performance: it was only sensitive to its specific stimulation and gave no response to other stimulations. The three sensors in the matrix detected external stimuli simultaneously and relayed independent electrical signals. 2D color mappings of the simultaneous multifunctional sensing were collected. The device architecture developed here for use as a multifunctional E-skin sensor matrix not only avoided the preparation of several materials separately; it enabled sensor integration using a simple lamination method.