| 초록 |
Recent progresses in piezoresistive pressure sensor are exploring flexible, transparent, and finger-touchable devices, expecting to be controlled and monitored in various electronic applications. However, they still have issues regarding low optical transparency and poor operational durability because high concentration of non-transparent conductive fillers is required to obtain sufficient piezoresistivity. Here, we report a highly sensitive, transparent, and durable piezoresistive pressure sensor composed of sea-urchin shaped metal nanoparticles (SSNPs) and polyurethane (PU) elastomer for the first time. It showed outstanding pressure sensing performance with high sensitivity (2.46 kPa-1), fast response/relaxation time (30 ms), and high transmittance (84.8%) due to the effective quantum tunnelling effect among SSNPs in the PU elastomer. We anticipate that the new pressure sensor composed of SSNPs and insulating elastomers can be a key component of various force sensing applications. |
