Abstract
This article presented a quartz crystal microbalance (QCM) humidity sensor covered with chitosan/molybdenum disulfide (CS/MoS2) composite film. The prepared sensor possesses promising humidity sensing performance with high sensitivity [46.06 Hz/% relative humidity (RH)], short response/recovery time (15/3 s), and small humidity hysteresis (2.5% RH). Most notably, the MoS2 nanoflowers that play a supporting role in the CS/MoS2 composite significantly reduce the swelling effect of CS in humid environments, enabling the CS/MoS2-based QCM humidity sensor to maintain a high <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${Q}$ </tex-math></inline-formula> -factor even under high humidity conditions, thereby considerably improving the stability of the sensor.
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