A Fully Integrated Wireless Flexible Ammonia Sensor Fabricated by Soft Nano-Lithography

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Flexible sensors based on one-dimensional nanostructures offer high flexibility and low power consumption for ammonia (NH3) detection.
• Challenges remain in the reliable and cost-effective fabrication of ordered nanostructure-based flexible sensors.

Purpose of the Study:

• To develop a smartphone-enabled integrated system for real-time ammonia (NH3) monitoring using flexible nanowire sensors.
• To address the challenges in fabricating ordered nanostructure-based flexible sensors cost-effectively.

Main Methods:

• Fabrication of highly aligned, sub-100 nm nanowires on a flexible substrate using soft lithography.
• Integration of the flexible nanowire sensor with a smartphone for real-time signal display and data acquisition.
• Characterization of sensor performance, including flexibility, durability, sensitivity, selectivity, and reproducibility.

Main Results:

• The developed nanowire-based sensor demonstrated robust flexibility and mechanical durability.
• The integrated NH3 sensing system achieved a low detection limit of 100 ppb with high selectivity and reproducibility.
• The flexible nanowire sensor exhibited ultra-low power consumption (3 μW).

Conclusions:

• The smartphone-enabled integrated system provides a portable and efficient solution for real-time ammonia (NH3) detection in daily life.
• The system demonstrated reliable application in monitoring food spoilage.
• This technology offers a promising approach for low-cost, high-performance flexible sensing applications.