Richardson T H, Dooling C M, Jones L T, Brook R A
Department of Physics, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK.
Adv Colloid Interface Sci. 2005 Nov 30;116(1-3):81-96. doi: 10.1016/j.cis.2005.04.009. Epub 2005 Aug 25.
A series of meso-substituted metal-free porphyrins has been developed which show high sensitivity to NO2 gas in the sub-5 ppm concentration range. By selecting different substituents, it has been possible to improve in a systematic manner the response time and sensitivity of the porphyrin LB film to NO2. Initially, a sulphonamino substituent yielded a fairly long response time of around 450 s but this was shortened considerably when this substituent was changed for a stearamido group. Further modifications resulted in achieving a porphyrin LB film which exhibited a t50 response time of only 11 s. By using an optically inert calixarene host material in which the porphyrin guest was incorporated, it was possible to obtain t50 values as low as 5 s.
已开发出一系列中位取代的无金属卟啉，它们在低于5 ppm的浓度范围内对二氧化氮气体表现出高灵敏度。通过选择不同的取代基，可以系统地改善卟啉LB膜对二氧化氮的响应时间和灵敏度。最初，一个磺氨基取代基产生了约450秒的相当长的响应时间，但当这个取代基换成硬脂酰胺基时，响应时间大大缩短。进一步的修饰导致获得了一种卟啉LB膜，其t50响应时间仅为11秒。通过使用掺入了卟啉客体的光学惰性杯芳烃主体材料，可以获得低至5秒的t50值。
