Abstract
For the immediate detection of gaseous strong acids, it is advantageous to employ colorimetric textile sensors based on halochromic dyes. Thus, a rhodamine dye with superior pH sensitivity and high thermal stability was synthesized and incorporated in nylon 6 and polyester fabrics to fabricate textile sensors through dyeing and printing methods. The spectral properties and solubility of the dye were examined; sensitivity to acidic gas as well as durability and reversibility of the fabricated textile sensors were investigated. Both dyed and printed sensors exhibited a high reaction rate and distinctive color change under the acidic condition owing to the high pH sensitivity of the dye. In addition, both sensors have outstanding durability and reversibility after washing and drying.
Highlights
As chemical industries have grown gradually, strong acids such as hydrochloric acid, sulfuric acid, and hydrofluoric acid are commonly used in almost all industries worldwide
The reactions were monitored by Thin layer chromatography (TLC)
A novel rhodamine dye with high pH sensitivity and durability was synthesized, and textile sensors based on the dye were fabricated through dyeing and printing methods in order to immobilize the dye on nylon 6 or Polyethylene terephthalate (PET) textiles
Summary
As chemical industries have grown gradually, strong acids such as hydrochloric acid, sulfuric acid, and hydrofluoric acid are commonly used in almost all industries worldwide. In spite of their usefulness, these strong acids can be dangerous as their accidental ingestion, inhalation, or skin contact may cause intoxication. Gaseous strong acids need more precautions because in case of leakage, they diffuse very quickly without being noticed. In order to detect such leakage at an early stage, many industrial sites have utilized semiconductor-based gas sensors. These sensors are expensive and electricity-consuming and require that the worker always carry heavy and bulky equipment. There is a need for quick and easy detection of gas leakage
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