Halochromic Cotton Fabrics Prepared by layer-by-layer Assembly

ABSTRACT

Halochromic cotton fabrics were fabricated based on a layer-by-layer technique. The formation of multiple layers from polyelectrolytes with opposite charges was confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy. UV–vis spectroscopy and color analysis revealed that the obtained fabrics produce a clear and rapid color response. The color change is reversible, and the switching process can be repeated 10 times. It was also found that dyes located in the surface layers were more likely to leach when immersed in NaCl solutions. Due to its efficiency and simplicity, this halochromic cotton fabric could be utilized as a naked-eye sensing label or test strip to monitor pH.

摘要

采用逐层工艺制备了卤代变色棉织物. 傅立叶变换红外光谱和扫描电子显微镜证实了具有相反电荷的聚电解质形成多层. 紫外-可见光谱和颜色分析表明, 所得织物产生清晰快速的颜色响应. 颜色变化是可逆的, 切换过程可以重复10次. 研究还发现, 当染料浸泡在NaCl溶液中时, 位于表层的染料更有可能浸出. 由于其效率和简单性, 这种卤化棉织物可以用作肉眼传感标签或测试条来监测pH值.

KEYWORDS:

• Halochromism
• layer-by-layer
• cotton fabric
• sensor
• stability
• reversibility

关键词:

• 嗜盐性
• 逐层
• 棉织物
• 传感器
• 稳定性
• 可逆性

Highlights

• The halochromic cotton fabrics could complete the color change with 10s.

• The interaction between dyes and substrates could affect the halochromic property.

• The halochromic fabrics presented excellent reversible color change according to pH variation.

• Ionic strength had little effect on the color of the halochromic samples.

Disclosure statement

No potential conflict of interest was reported by the author(s).