Core-Shell PEDOT-PVDF Nanofiber-Based Ammonia Gas Sensor with Robust Humidity Resistance

Area of Science:

• Materials Science
• Chemical Engineering
• Sensor Technology

Background:

• Ammonia sensors are crucial for environmental monitoring and industrial safety.
• Existing sensors suffer from reduced accuracy due to cross-sensitivity with water vapor, causing unreliable readings.
• Developing humidity-resistant ammonia sensors is essential for practical applications.

Purpose of the Study:

• To develop a novel core-shell nanofiber (CSNF) structure for ammonia sensing.
• To enhance sensor performance by mitigating water vapor interference.
• To evaluate the sensitivity and humidity resistance of the new sensor design.

Main Methods:

• Fabrication of core-shell nanofibers using conductive poly(3,4-ethylenedioxythiophene) (PEDOT) as the core and hydrophobic polyvinylidene fluoride-tetrafluoroethylene (PVDF-TrFE) as the shell.
• Characterization of the CSNF structure, including diameter and shell thickness.
• Performance testing of PEDOT-PVDF CSNF sensors against conventional PEDOT membranes under varying ammonia concentrations and relative humidity (RH) levels.

Main Results:

• The PEDOT-PVDF CSNF structure demonstrated superior sensitivity and humidity resistance compared to conventional PEDOT membranes.
• CSNF sensors exhibited a tenfold performance improvement in humid environments (51% RH) for ammonia detection (10-100 ppm).
• The hydrophobic PVDF-TrFE shell effectively reduced water vapor interference.

Conclusions:

• The developed CSNF structure offers a promising solution for accurate ammonia detection.
• These sensors maintain high performance across a range of humidity levels, addressing a key limitation of current technologies.
• The findings support the potential of CSNF sensors for reliable, real-world ammonia monitoring applications.