Fully Solution-Processed Non-Contact Printed Capacitive Sensor with Dispensing Printed Carbon Electrode and Transfer Printed g-C3N4 Doped PVDF Polymer Capacitive Layer

In recent years, flexible capacitive tactile sensors have garnered increasing attention from researchers worldwide. They have focused on enhancing the sensor's preparation method, mechanical properties, sensitivity, and other aspects, making it a significant area of research. This paper presents a simple yet effective approach for fabricating a highly sensitive haptic sensor using the dot matrix printing technique. The sensor's forked finger electrode is prepared through this method, followed by the printing of graphene carbon nitride/ polyvinylidene fluoride (GCN/PVDF) dielectric layer on the electrode. By utilizing the exceptional properties of GCN/PVDF, the electrodes printed on a glass substrate can be successfully transferred to the dielectric layer. This enables the fabrication of carbon electrodes as flexible devices through high-temperature curing conditions, thereby enhancing the overall performance of the sensor. The resultant sensor exhibits excellent mechanical properties and performs admirably in both contact and non-contact systems. Moreover, the sensor is designed and arranged as a flexible wearable touch-sensitive keyboard, capable of accurately capturing the user's touch and duration. This design opens up possibilities for various applications, such as flexible keyboards. Experimental results demonstrate that the sensors prepared in this study possess significant potential for integration into wearable electronic devices. In summary, this paper presents a straightforward yet effective method for preparing a highly sensitive haptic sensor. By leveraging the dot matrix printing technique and GCN/PVDF dielectric layer, the sensor demonstrates excellent mechanical properties and performs exceptionally well in both contact and non-contact scenarios. The successful integration of these sensors into a flexible wearable touch-sensitive keyboard further highlights their potential for various applications in wearable electronics.