Wearable Nano-Based Gas Sensors for Environmental Monitoring and Encountered Challenges in Optimization.

Area of Science:

• Environmental Science and Engineering
• Materials Science
• Sensor Technology

Background:

• Growing public safety concerns necessitate effective indoor and outdoor air quality monitoring.
• Detecting toxic gaseous pollutants is crucial for environmental sustainability and public health.

Purpose of the Study:

• To review advancements in smart wearable nanosensors for monitoring harmful gaseous pollutants.
• To explore challenges in sensor performance enhancement and the evolution of sensing technologies.

Main Methods:

• Comprehensive review of sensing materials, including 2D nanostructures, carbon nanomaterials, conducting polymers, nanohybrids, and metal oxide semiconductors.
• Analysis of wearable substrates, electrodes, and sensor types.
• Discussion on critical performance metrics: circuit integration, miniaturization, real-time sensing, repeatability, reusability, power efficiency, material deposition, selectivity, sensitivity, stability, and response/recovery time.

Main Results:

• Identified key materials and technological components driving the development of wearable gas sensors.
• Highlighted challenges and gaps in current sensor performance and knowledge.
• Provided a detailed examination of factors influencing sensor efficacy and longevity.

Conclusions:

• Smart wearable nanosensors show significant promise for real-time monitoring of toxic gases.
• Further research is needed to overcome challenges in selectivity, sensitivity, stability, and power efficiency.
• Future directions focus on optimizing materials and system integration for enhanced air quality management.