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ACS Appl Mater Interfaces. 2017 Aug 16;9(32):26974-26982. doi: 10.1021/acsami.7b05672. Epub 2017 Aug 2.

Paper-Based Bimodal Sensor for Electronic Skin Applications.

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Department of Display and Semiconductor Physics, Korea University , Sejong 30019, Republic of Korea.
Department of Chemistry and Institute of Biological Interfaces, Sogang University , Seoul 04107, Republic of Korea.
School of Polymer Science and Engineering, Chonnam National University , Gwangju 61186, Republic of Korea.


We present the development of a flexible bimodal sensor using a paper platform and inkjet printing method, which are suited for low-cost fabrication processes and realization of flexible devices. In this study, we employed a vertically stacked bimodal device architecture in which a temperature sensor is stacked on top of a pressure sensor and operated on different principles, allowing the minimization of interference effects. For the temperature sensor placed in the top layer, we used the thermoelectric effect and formed a closed-loop thermocouple composed of two different printable inks (conductive PEDOT:PSS and silver nanoparticles on a flexible paper platform) and obtained temperature-sensing capability over a wide range (150 °C). For the pressure sensor positioned in the bottom layer, we used microdimensional pyramid-structured poly(dimethylsiloxane) coated with multiwall carbon nanotube conducting ink. Our pressure sensor exhibits a high-pressure sensitivity over a wide range (100 Pa to 5 kPa) and high-endurance characteristics of 105. Our 5 × 5 bimodal sensor array demonstrates negligible interference, high-speed responsivity, and robust sensing characteristics. We believe that the material, process, two-terminal device, and integration scheme developed in this study have a great value that can be widely applied to electronic skin.


e-skin; flexible device; inkjet printing; paper electronics; wearable device


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