Aerosol-Printed MoS₂ Ink as a High Sensitivity Humidity Sensor.

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Molybdenum disulfide (MoS₂) shows promise for nanoelectronic devices.
• MoS₂ has potential applications in humidity sensing.
• Developing efficient humidity sensors is crucial for various technological applications.

Purpose of the Study:

• To develop a low-cost and straightforward method for fabricating high-performance humidity sensors using MoS₂ ink.
• To investigate the sensing performance of aerosol-printed MoS₂ sensors.
• To elucidate the underlying mechanisms of water-induced conductivity changes in MoS₂ sensors.

Main Methods:

• MoS₂ ink was prepared using a sonication-assisted exfoliation method.
• Structural and morphological analyses were performed using SEM, Raman spectroscopy, and AFM.
• Aerosol printing was employed to fabricate the MoS₂ ink sensor.

Main Results:

• The MoS₂ ink sensor exhibited a remarkable conductivity increase of 6 orders of magnitude with a relative humidity change from 10% to 95% at room temperature.
• The sensor demonstrated fast response and recovery times, along with excellent repeatability.
• An analytical model accurately described the sensor's response, including ionic conduction regimes and percolation transition.

Conclusions:

• A cost-effective and simple strategy for fabricating high-performance humidity sensors using MoS₂ ink was established.
• The study provides fundamental insights into the sensing mechanism of MoS₂-based humidity sensors.
• The developed MoS₂ sensor is suitable for next-generation nanoelectronic applications requiring high humidity sensitivity.