Chromatic Sensing of Ammonia Gas Using Dye-incorporated Polyacrylonitrile Nanofiber

초록

Two different fabrication approaches for bromocresol green (BCG) incorporated polyacrylonitrile (PAN) nanofiber, i.e., drop-casting and blending methods, were investigated for chromatic sensing of ammonia gas with high sensitivity and responsivity. Interestingly, we found that the difference in the dye incorporation process resulted in different responsive behavior when the nanofiber mats were exposed to ammonia gas. The mat prepared by drop-casting of dye solution to pristine PAN nanofiber mat responded rapidly upon immediate exposure to ammonia gas, and the response time was found to be dependent on the concentration of citric acid which is an additive for control of responsivity. For the blending method, however, complete reversibility was attainable, which could not be observed from the dye-incorporated mat by the drop-casting method. The studies on the different chromatic change behavior will offer a significant means towards effective and efficient sensory platform by color changes upon exposure to specific gases.

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