Printable Highly Stable and Superfast Humidity Sensor Based on Two Dimensional Molybdenum Diselenide

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Transition metal dichalcogenides (TMDCs) exhibit high performance in nano-electronics, making them suitable for sensing.
• The inherent chemical and thermal stability of TMDCs supports real-time sensor applications.

Purpose of the Study:

• To propose and demonstrate a stable and superfast humidity sensor using two-dimensional Molybdenum diselenide (MoSe2).
• To utilize printed technologies for fabricating the MoSe2-based humidity sensor.

Main Methods:

• Synthesized few-layered MoSe2 nano-flakes via wet grinding.
• Fabricated interdigitated electrodes (IDEs) on PET substrate using screen-printing.
• Deposited MoSe2 thin film using spin coating and recorded impedance and capacitance responses.

Main Results:

• Achieved excellent repeatability with hysteresis <1.98% (impedance) and <2.36% (capacitance).
• Demonstrated high stability with maximum error rates of ~0.162% (impedance) and ~0.183% (capacitance).
• Recorded superfast response times: ~0.96s (impedance) and ~1.87s (capacitance), with recovery times of ~1.03s and ~2.13s, respectively.

Conclusions:

• The developed MoSe2 humidity sensor offers high performance, stability, and rapid response.
• The sensor is suitable for various real-time monitoring applications requiring precise humidity detection.