| 초록 |
Recent research trends of peizoresistive pressure sensor have been to improve flexibility, transparency and mechanical stability for application in various electronic devices. However, there are still several issues regarding limited operating pressure range, low transparency and poor durability due to intrinsic limitations of common conductive fillers. Here, we report an ultrasensitive and transparent piezoresistive pressure sensor based on a sea-urchin shaped metal nanopraticles-polyurethane composite film with microdome arrays. It showed a superior sensitivity of 71.37 kPa-1 with high transmittance (77.7%), rapid response/relaxation time (30 ms), ultralow detection limit (4 Pa), and outstanding stability due to the enhanced quantum tunneling effect from the stress concentration at small contact spots and the deformation on the contact area. We anticipate that this novel transparent pressure sensor will be a key component in the development of integrated transparent sensing system. |
