Hierarchical Self‐Assembly of Tetrakis(1‐pyrenyl)porphyrins into Microscopic Petals and Flowers with Ultrasensitive Room‐Temperature NO2 Sensing in a Broad Humidity Range. Issue 11 (25th September 2019)

• Record Type: Journal Article
• Authors: Sun, Qiqi; Liu, Qi; Gong, Lei; Wang, Chiming; Kong, Xia; Yang, Chaoyi; Feng, Weigang; Qi, Dongdong; Dai, Fangna; Li, Xiyou; Chen, Yanli
• Is Part Of: ChemNanoMat. Volume 5:Issue 11(2019)
• Page Start: 1408
• Page End: 1417
• Publication Date: 2019-09-25
• Subjects: NO2 sensor -- porphyrin -- pyrenyl -- relative humidity -- self-assembly; Nanochemistry -- Periodicals; Nanostructured materials -- Periodicals; Nanochemistry; Nanostructured materials; Periodicals; 541.2
• DOI: 10.1002/cnma.201900479
• Languages: English
• ISSNs: 2199-692X

Abstract

Abstract: A metal free meso ‐tetrakis(1‐pyrenyl)porphyrin H2 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 NO2 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 NO2 sensors operating under a broad RH range in terms of sensitivity and stability to humidity variations at room temperature. Abstract : Moisture‐resistant : Remarkably specific sensors for NO2 have been developed based on hierarchical self‐assembly of porphyrin devices. They are effective sensors over a broad humidity range.