Flexible nanofiber sensor for low-concentration hydrogen detection.

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Sensing

Background:

• Development of sensitive and stable hydrogen sensors is crucial for safety and industrial applications.
• Nanostructured materials offer unique properties for enhanced sensor performance.
• Palladium nanoparticles are known for their catalytic activity in hydrogen detection.

Purpose of the Study:

• To prepare and characterize a palladium nanoparticle-decorated polyacrylonitrile nanofiber network (Pd-PAN) for hydrogen sensing.
• To evaluate the sensor's sensitivity, stability, repeatability, and performance under varying environmental conditions.
• To investigate the mechanical flexibility and adaptability of the Pd-PAN sensor.

Main Methods:

• Fabrication of a three-dimensional Pd-PAN nanofiber network using a chemical bath method.
• Low-temperature annealing treatment for material stabilization and zero-drift elimination.
• Performance testing including sensitivity, repeatability, temperature dependence, and mechanical bending tests.

Main Results:

• The Pd-PAN sensor demonstrated high sensitivity, particularly for low-concentration hydrogen (minimum detectable limit of 2 ppm).
• Excellent repeatability was confirmed through continuous measurements, with stable performance across a temperature range of 30–70 °C.
• The sensor exhibited robust mechanical flexibility, showing minimal response difference under bending conditions, and faster response/recovery times at higher temperatures.

Conclusions:

• The Pd-PAN nanofiber network is a promising material for developing highly sensitive and stable hydrogen sensors.
• The sensor's excellent environmental adaptivity, mechanical flexibility, and low detection limit highlight its potential for practical applications.
• The developed sensor technology offers a reliable solution for low-concentration hydrogen detection in various environments.