Abstract
A humidity-sensitive discoloration polyester fabric induced by pH indicator cresol red/thymol blue is prepared via a facial screen printing. Boric acid can adjust the pH of the system as the humidity changes, thereby affecting the discoloration of cresol red/thymol blue. Silica gel and hydrophilic silica aerogel with porous structure are used as high-performance hygroscopic agent. The prepared humidity-sensitive discoloration cresol red/thymol blue polyester fabric (CRP/TBP) displays rapid response to relative humidity (RH) change and exhibits obvious color change. As humidity increases, the prepared discoloration polyester fabric shows multiple colors, of which the absorption peaks of CRP and TBP in the visible light range shifted from 430 nm to 440 nm–520 nm and 550 nm, respectively. The steady discoloration performance in the moisture absorption/drying process is observed after 25 cycles, pointing out good reversibility and repeatability of humidity-sensitive discoloration polyester fabric. Considering these excellent properties, humidity-sensitive discoloration polyester fabrics are promising as sensitive RH detector with potential application in colorimetric sensors, decorative coatings and anti-counterfeiting technology.
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