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Hierarchical Self‐Assembly of Tetrakis(1‐pyrenyl)porphyrins into Microscopic Petals and Flowers with Ultrasensitive Room‐Temperature NO 2 Sensing in a Broad Humidity Range
Author(s) -
Sun Qiqi,
Liu Qi,
Gong Lei,
Wang Chiming,
Kong Xia,
Yang Chaoyi,
Feng Weigang,
Qi Dongdong,
Dai Fangna,
Li Xiyou,
Chen Yanli
Publication year - 2019
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201900479
Subject(s) - relative humidity , porphyrin , humidity , petal , materials science , analytical chemistry (journal) , atmospheric temperature range , cobalt , chemistry , chromatography , photochemistry , meteorology , metallurgy , horticulture , physics , biology
A metal free meso ‐tetrakis(1‐pyrenyl)porphyrin H 2 T[(Pyr) 4 ]P ( 1 ) and its cobalt congener CoT[(Pyr) 4 ]P ( 2 ) are firstly fabricated into the hierarchical nanopetals and micro‐ball‐flowers, respectively, by a simple solution‐based method. Unexpectedly highly sensitive, stable, selective and reproducible responses to 50–400 ppb NO 2 gas are obtained at room temperature for the aggregates of both 1 and 2 , within 2 min dynamic exposure period at a broad relative humidity (RH) range of 0%‐75%. In particular, the micro‐ball‐flowers of 2 achieve a sensitivity of 91.4 and 214% ppm −1 at 45% RH and 75% RH, respectively, demonstrating the potentials as chemical sensors operating in real‐world atmospheres. Furthermore, the sensitivity of 1 and 2 remains almost unchanged under 0%–75% RH after 6 months. The present work represents one of the best results among organic‐based ppb‐level NO 2 sensors operating under a broad RH range in terms of sensitivity and stability to humidity variations at room temperature.