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4 years ago

Rough-Surface-Enabled Capacitive Pressure Sensors with 3D Touch Capability

Rough-Surface-Enabled Capacitive Pressure Sensors with 3D Touch Capability
Gwangmook Kim, Kilsoo Lee, Subin Kang, SeulGee Kim, Dae-Eun Kim, Sungjun Cho, Wooyoung Lee, Shinill Kang, Jae-Kang Kim, Youngjae Kim, Taeyoon Lee, DaeEun Kim, Wooyoung Shim, Jaehong Lee
Fabrication strategies that pursue “simplicity” for the production process and “functionality” for a device, in general, are mutually exclusive. Therefore, strategies that are less expensive, less equipment-intensive, and consequently, more accessible to researchers for the realization of omnipresent electronics are required. Here, this study presents a conceptually different approach that utilizes the inartificial design of the surface roughness of paper to realize a capacitive pressure sensor with high performance compared with sensors produced using costly microfabrication processes. This study utilizes a writing activity with a pencil and paper, which enables the construction of a fundamental capacitor that can be used as a flexible capacitive pressure sensor with high pressure sensitivity and short response time and that it can be inexpensively fabricated over large areas. Furthermore, the paper-based pressure sensors are integrated into a fully functional 3D touch-pad device, which is a step toward the realization of omnipresent electronics. High-performance paper-based pressure sensors are developed through inartificial design of the surface curl and roughness of paper and graphite. The proposed approach involves writing on paper with a pencil, and the sensors can be inexpensively fabricated over a large area. The paper-based pressure sensors are integrated into a fully functional 3D touch-pad device, which is a step toward the realization of advanced paper electronics.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201700368

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