材料科学
膜
静电纺丝
共价键
水溶液
二氧化硅
化学工程
纳米纤维
pH指示剂
兴奋剂
溶胶凝胶
可用的
纳米技术
有机化学
复合材料
聚合物
光电子学
计算机科学
化学
万维网
工程类
生物化学
作者
Jozefien Geltmeyer,Gertjan Vancoillie,Iline Steyaert,Bet Breyne,Gabriella Cousins,Kathleen Lava,Richard Hoogenboom,Klaartje De Buysser,Karen De Clerck
标识
DOI:10.1002/adfm.201602351
摘要
Colorimetric sensors for monitoring and visual reporting of acidic environments both in water and air are highly valuable in various fields, such as safety and technical textiles. Until now sol‐gel‐based colorimetric sensors are usually nonflexible bulk glass or thin‐film sensors. Large‐area, flexible sensors usable in strong acidic environments are not available. Therefore, in this study organically modified silicon oxide nanofibrous membranes are produced by combining electrospinning and sol‐gel technology. Two pH‐indicator dyes are immobilized in the nanofibrous membranes: methyl yellow via doping, methyl red via both doping, and covalent bonding. This resulted in sensor materials with a fast response time and high sensitivity for pH‐change in water. The covalent bond between dye and the sol‐gel network showed to be essential to obtain a reusable pH‐sensor in aqueous environment. Also a high sensitivity is obtained for sensing of HCl and NH 3 vapors, including a memory function allowing visual read‐out up to 20 min after exposure. These fast and reversible, large‐area flexible nanofibrous colorimetric sensors are highly interesting for use in multiple applications such as protective clothing and equipment. Moreover, the sensitivity to biogenic amines is demonstrated, offering potential for control and monitoring of food quality.
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