Light-Modulated Humidity Sensing in Spiropyran Functionalized MoS₂ Transistors.

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Hybrid organic/inorganic heterostructures combine photochromic molecules with 2D semiconductors (2DSs) for multi-responsive applications.
• Photochromic molecules undergo reversible structural changes upon light exposure, enabling tunable properties.

Purpose of the Study:

• To create a light-switchable, bi-functional field-effect transistor using spiropyran and molybdenum disulfide (MoS2).
• To demonstrate remote control of electron transport and wettability in the hybrid structure.
• To investigate the impact of light-controlled modulation on humidity sensing sensitivity.

Main Methods:

• Fabrication of a spiropyran-molybdenum disulfide (MoS2) heterostructure.
• Utilizing spiropyran-merocyanine reversible photo-isomerization to control device properties.
• Testing the hybrid heterostructure for relative humidity (RH) sensing across a 10%-75% range.

Main Results:

• The spiropyran-MoS2 heterostructure exhibited light-switchable control over electron transport and wettability.
• The device accurately monitored relative humidity (RH) from 10% to 75%.
• A good sensitivity of 1.0% · (%) RH^-1 was achieved.

Conclusions:

• Light-controlled modulation of sensitivity in chemical sensors enhances selectivity and versatility.
• This hybrid organic/inorganic approach offers a promising pathway for advanced, multi-responsive sensing applications.
• The developed device demonstrates significant potential for improving chemical sensor performance.