Green Light-Driven Ultraselective Trimethylamine Detection Using In₂S₃ Nanoflakes at Room Temperature for Fish...

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Visible light-activated chemoresistive gas sensors offer advantages like low power consumption and room-temperature operation.
• Detecting volatile organic compounds (VOCs) and amine gases using light activation is challenging due to high energy requirements.

Purpose of the Study:

• To demonstrate green-light-activated trimethylamine (TMA) detection using beta-Indium Sulfide (β-In2S3) nanoflakes.
• To investigate the sensing mechanism and material properties for selective gas detection.

Main Methods:

• Fabrication of β-In2S3 nanoflakes (NFs) for gas sensing applications.
• Utilizing density functional theory (DFT) calculations to understand gas-material interactions.
• Testing sensor performance under visible light (green wavelength) and in dark conditions.

Main Results:

• β-In2S3 NFs showed a 55-fold increase in TMA response under green light compared to dark conditions.
• Achieved rapid detection and ultrahigh selectivity for TMA.
• Successfully applied the sensors for real-time fish quality monitoring under ambient conditions.

Conclusions:

• Intrinsic defects in β-In2S3 play a crucial role in enhancing gas interactions.
• Wavelength-controlled light activation provides a novel strategy for selective gas molecule detection.
• This technology enables practical applications in food quality assessment.