A Novel Porphyrin-Containing Polyimide Nanofibrous Membrane for Colorimetric and Fluorometric Detection of Pyridine Vapor

Sensors

Yuanyuan Lv¹  Yani Zhang²  Yanglong Du²  Jiayao Xu² 

[1] School of Medicine, Zhejiang University City College, Hangzhou 310015, China;

关键词: zinc porphyrin;    nanofibrous membrane;    colorimetric sensor;    fluorometric sensor;    pyridine vapor;   

DOI  :  10.3390/s131115758

来源: mdpi

【 摘 要 】

A novel zinc porphyrin-containing polyimide (ZPCPI) nanofibrous membrane for rapid and reversible detection of trace amounts of pyridine vapor is described. The membrane displays a distinct color change, as well as dramatic variations in absorption and fluorescent emission spectra, upon exposure to pyridine vapor. This condition allows the detection of the analyte at concentrations as low as 0.041 ppm. The vapochromic and spectrophotometric responses of the membrane are attributed to the formation of the ZPCPI-pyridine complex upon axial coordination. From surface plasmon resonance analysis, the affinity constant of ZPCPI-pyridine complex was calculated to be (3.98 ± 0.25) × 10⁴ L·mol⁻¹. The ZPCPI nanofibrous membrane also showed excellent selectivity for pyridine vapor over other common amines, confirming its applicability in the manufacture of pyridine-sensitive gas sensors.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.