Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 401, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2023.135050
Keywords
Polyimide; Graphene oxide; Aerogel; Flexible capacitive humidity sensor; Laser direct writing; Water content detection
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In this study, a self-standing high performance flexible capacitive humidity sensor was developed using a composite of polyimide aerogel and graphene oxide. The sensor demonstrated high sensitivity and stability, and could monitor respiration and finger movement while also detecting water content in liquids.
High performance flexible capacitive humidity sensors (FCHS) are desirable due to application potentials in wearable electronics. Herein, we report a self-standing FCHS consisting of a composite of polyimide (PI) aerogel and graphene oxide (GO). Specifically, PI aerogel was modified with NaOH and GO, and treated with laser direct writing to reduce GO to construct electrodes on the surfaces of PI aerogel to fabricate a parallel-type FCHS. Resulting FCHS with 3D interconnected porous structure exhibited capacitance change from -10 pF to -1000 pF between relative humidity of 11-98 %, showing high sensitivity. Moreover, it displayed good stability against large deformations. The FCHS could monitor respiration and differentiate non-contact finger movement. Of note is that it could detect water content in both ethanol and hydraulic oil with high sensitivity, indicating dual function of measuring water content in both air and liquids. The work provides a facile approach for developing advanced flexible water sensors with broader application prospects.
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