Highly Responsive, Ultrafast and Stable Ethanol Sensor Based on Silver Nanoparticle‐Decorated Woven Polyester Fabric Device for Real‐Time Detection at Room Temperature

Herein, a simple yet highly effective ethanol sensor using a woven polyester fabric decorated with ≈15 nm Ag nanoparticles is developed. The Ag nanoparticles are deposited through a dip‐coating process, forming a uniform layer on the fabric threads and increasing the surface area. The Ag nanoparticle‐decorated fabric‐based device exhibits a strong ethanol sensing capability at room temperature under 20 V applied bias. The sensor detects ethanol concentrations as low as 30 ppm, with a maximum detection capacity of 180 ppm (beyond which the response saturates) and ultrafast response time of 50 ms and recovery time of 200 ms. The sensor maintains stable performance over 100 days, even under varying humidity levels. While higher humidity slightly reduces response due to competing adsorption of water molecules, the device still functions reliably. To further explore practical applications, the fabric‐based sensor is integrated into a prototype ethanol analyzer. The handheld gadget successfully detects ethanol in real time, showcasing the sensor's potential for real‐world applications. Overall, this work presents a simple, cost‐effective, and highly responsive ethanol sensor based on Ag nanoparticle‐decorated fabric. Its excellent and fast responsiveness, reversibility, long‐term stability makes it a promising candidate for use in breath analyzers and other gas‐sensing applications.