A flexible calligraphy-integrated in situ humidity sensor

摘要

The development of a humidity sensor integrated with calligraphy art could open up exciting opportunities for the development of "smart art", which can be applied in arts, architecture, and environmental monitoring. PEDOT:PSS has shown excellent electrical and sensing properties as a conducting polymer. Calligraphy has a long history in both eastern and western countries, and is still widely used as an art form. Here, we show, for the first time, the development of an "invisible" and flexible humidity sensor by integrating calligraphy and a PEDOT:PSS sensing electrode. The sensor is embedded onto calligraphy text and can detect surrounding environmental humidity without being visible. The sensor exhibits rapid and highly sensitive detection of humidity with a detection range of 10-90% relative humidity with a measuring time of about 30 s. We anticipate that these results could provide significant opportunities for both fundamental studies as well as practical applications of flexible sensors. (C) 2019 Published by Elsevier Ltd.