Li Ligui, Ferng Lin-Huei, Yang Catherine, Ji Hai-Feng
J Nanosci Nanotechnol. 2014 Sep;14(9):6593-8. doi: 10.1166/jnn.2014.9364.
Sensing technology is the key of intelligent packaging. A variety of different sensing systems for indicating freshness through intelligent packaging have been presented. Polyaniline (PANI) can change its color reversibly through the acid-base reaction with reactive compounds and has been widely used in different kinds of sensors. However, because PANI is insoluble in common organic solvents, this limits its practical usage in many applications. In this work, a highly stable polyaniline-poly(sodium 4-styrenesulfonate) (PANI:PSS) colloid has been developed as a facile colorimetric sensor of volatile amines. The results showed the PANI:PSS colloid is quite sensitive to changes in pH. When PANI:PSS colloids were homogenously deposited on filter paper, the paper are used as a sensor to detect triethylamine (TEA) vapor. The green color of the test paper changed to blue at a TEA concentration as low as 188 ppm.
传感技术是智能包装的关键。人们已经提出了多种通过智能包装指示新鲜度的不同传感系统。聚苯胺（PANI）可通过与反应性化合物的酸碱反应可逆地改变其颜色，并已广泛应用于各类传感器中。然而，由于聚苯胺不溶于常见有机溶剂，这限制了它在许多应用中的实际使用。在这项工作中，一种高度稳定的聚苯胺 - 聚（4 - 苯乙烯磺酸钠）（PANI:PSS）胶体已被开发为一种便捷的挥发性胺比色传感器。结果表明，PANI:PSS胶体对pH值变化非常敏感。当PANI:PSS胶体均匀沉积在滤纸上时，该滤纸用作检测三乙胺（TEA）蒸气的传感器。在TEA浓度低至188 ppm时，试纸的绿色变为蓝色。
