High performance conductimetric sensor for detection of trace triethylamine based on the metalloporphyrin 2D-conjugated polymer assisted with a phosphating strategy

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2023-06, Vol.666, p.131289, Article 131289
• Main Authors: Wei, Chuangyu, Gao, Fei, Yu, Jinshi, Zhuo, Hongyan, Gao, Xinyu, Zhang, Yuexing, Li, Xiyou, Chen, Yanli
• Format: Article
• Language: English
• Subjects: 2D-Conjugated polymer; Gas sensor; Porphyrin; Triethylamine
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2023.131289

Porphyrin conjugated polymers (PorCPs) have emerged as next-generation semiconducting materials with pre-designed π-electronic skeletons and highly ordered topological structures, especially for gas sensing applications. In this study, two porphyrin conjugated polymers M-PorCPs (M = Fe and Co) with highly dispersed central metal active adsorption sites were prepared, and the band gaps of the M-PorCP were adjusted by phosphating process. Both M-PorCP and the resulted P @ M-PorCP are characterized by a wide range of methods including FT-IR, Raman, X-ray diffraction, SEM, TEM, UPS, UV–vis diffuse reflectance spectra, BET, and current–voltage (I–V) measurements. The experimental results indicate that subsequent phosphating improves electrical conductivity of the parent M-PorCPs by an order of magnitude (from ∼10−5 S cm−1 to 10−4 S cm−1) thanks to the smaller band gap of the resulted P @ M-PorCPs than their parent polymer M-PorCPs but the structures of polymer are maintained. Moreover, the sensing behavior of the both P @ M-PorCPs and M-PorCPs was investigated towards triethylamine (TEA) vapor in the 1–10 ppm range. High sensitive responses to TEA are obtained for the four sensors with the increasing degree in the order of Co-PorCP