Recent Progress on Flexible Room-Temperature Gas Sensors Based on Metal Oxide Semiconductor

Area of Science:

• Materials Science
• Sensor Technology
• Nanotechnology

Background:

• Metal oxide semiconductors (MOS) are traditional gas sensing materials but require high operating temperatures.
• The Internet of Things (IoT) drives demand for portable, low-power gas sensors.
• Flexible room-temperature (FRT) sensors offer advantages in power consumption and device integration.

Purpose of the Study:

• To review recent advancements in MOS-based FRT gas sensors.
• To discuss sensing mechanisms, performance, and flexibility characteristics.
• To explore applications and future directions for FRT gas sensors.

Main Methods:

• Review of literature on five types of MOS-based FRT gas sensors.
• Analysis of pristine MOS, modified MOS (noble metal nanoparticles, organic polymers, carbon-based materials, 2D transition metal dichalcogenides).
• Discussion of light-illumination effects on gas sensing performance.

Main Results:

• Various modifications enhance MOS-based FRT gas sensor performance.
• Light illumination can significantly improve gas sensing capabilities.
• FRT sensors demonstrate potential for diverse applications.

Conclusions:

• MOS-based FRT gas sensors are a promising technology for portable sensing.
• Material engineering and light assistance are key to improving performance.
• Further research can unlock broader applications in IoT and beyond.