Crystalline microporous small molecule semiconductors based on porphyrin for high-performance chemiresistive gas sensing

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 1; no. 24; pp. 12977 - 12983
• Main Authors: Deng, Wei-Hua, He, Liang, Chen, Er-Xia, Wang, Guan-E, Ye, Xiao-Liang, Fu, Zhi-Hua, Lin, Qipu, Xu, Gang
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 21.06.2022
• Subjects: Charge transport; Crystals; detection limit; Gas sensors; hydrogen; Hydrogen bonding; Molecular structure; Nitrogen dioxide; Porosity; Porous materials; porous media; Porphyrins; semiconductors
• DOI: 10.1039/d1ta10945f
• ISSN: 2050-7488; 2050-7496

Organic small molecule semiconductor (OSMS) microporous crystals with strong π-π interactions are rare but have great potential in applications requiring both excellent mass and charge transport. To obtain such a microporous structure, effective molecule design and control over the packing of the OSMS are necessary but still challenging. Herein, we report three meso -tetrakis (4-carboxyphenyl) porphyrin (TCPP) based porous OSMS materials, 1 , 2 and 3 , whose porosity and π-π interactions among TCPPs were modulated by varying the H-bonding linkage nodes. The relationship among the hydrogen bonding structure, packing mode and sensing performances has been carefully studied. With the largest overlap between porphyrin rings and strongest face-to-face π-π interactions in the prepared compound, 1 showed the best performances. Moreover, it also represents the first RT NO 2 chemiresistive sensing material that simultaneously achieved an experimental limit of detection as low as 20 ppb and a time of recovery as short as 0.6 min. This work revealed the key role of H-bonding linkage node in constructing a microporous OSMS and provides a new type of high-performance rt chemiresistive gas sensing material. Organic small molecule semiconductor (OSMS) microporous crystals with strong π-π interactions are rare but have great potential in applications requiring both excellent mass and charge transport.