Abstract
The colorimetric sensor is a facile, cost-effective, and non-power-operated green energy material for gas detection. In this study, the colorimetric sensing property of a meta-aramid/dye 3 nanofiber sensor for ammonia (NH3) gas detection was investigated. This colorimetric sensor was prepared using various dye 3 concentrations via electrospinning. Morphological, thermal, structural, and mechanical analyses of the sensor were carried out by field-emission scanning electron microscopy, thermogravimetric analysis, Fourier-transform infrared spectroscopy, and a universal testing machine, respectively. A homemade computer color matching machine connected with a gas flow device characterized the response of the meta-aramid/dye 3 nanofiber colorimetric sensor to various exposure levels of NH3 gas. From the results, we confirmed that this colorimetric green energy sensor could detect ammonia gas in the concentration of 1–10 ppm with a sensing response time of 10 s at room temperature. After washing with laundry detergent for 30 min, the colorimetric sensors still exhibited sensing property and reversibility.
Highlights
Ammonia has been widely used as a catalyst or reagent in various industries such as agriculture, living environments, medical treatments, and other industrial applications [1]
After the NH3 exposure, the bright or vivid orange color no significant difference in the diameter of the fibers after washing; the net structure of the of colorimetric sensor specimens changed to a dull and dark brown tone
We confirmed the fabrication of a facile meta-aramid/dye 3 nanofiber that could be used in an ammonia gas sensor for protective clothing in industry and daily life
Summary
Ammonia has been widely used as a catalyst or reagent in various industries such as agriculture, living environments, medical treatments, and other industrial applications [1]. Ammonia gas (NH3 ) is colorless, explosive toxic, and has a pungent smell. The NH3 concentration limit set by the occupational safety and health administration is 25 ppm and people feel uncomfortable above this level due to odor and irritation. If the concentration of NH3 increased up to 300 ppm, it may lead to death [2,3,4,5]. It is important to continuously detect and monitor the leakage of NH3 to guarantee the health and safety on industrial sites and in daily life.
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