Molybdenum disulfide
(MoS
2
) is attractive for use in
next-generation nanoelectronic devices and exhibits great potential
for humidity sensing applications. Herein, MoS
2
ink was
successfully prepared via a simple exfoliation method by sonication.
The structural and surface morphology of a deposited ink film was
analyzed by scanning electron microscopy (SEM), Raman spectroscopy,
and atomic force microscopy (AFM). The aerosol-printed MoS
2
ink sensor has high sensitivity, with a conductivity increase by
6 orders of magnitude upon relative humidity increase from 10 to 95%
at room temperature. The sensor also has fast response/recovery times
and excellent repeatability. Possible mechanisms for the water-induced
conductivity increase are discussed. An analytical model that encompasses
two ionic conduction regimes, with a percolation transition to an
insulating state below a low humidity threshold, describes the sensor
response successfully. In conclusion, our work provides a low-cost
and straightforward strategy for fabricating a high-performance humidity
sensor and fundamental insights into the sensing mechanism.
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