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Phthalocyanine sensor array based on sensitivity and current changes for highly sensitive identification of three toxic gases in ppb levels

Abstract

A series of cobalt and metal-free phthalocyanine ambipolar semiconductors, MPc[β/α-O(4-CF3-Ph)4] (M=Co, 2H), (1-4) were synthesized and fabricated into the self-assembled microstructures. Co[Pc(β/α-OPhCF3)4] (1 and 3) molecules formed one-dimensional (1D) nanoribbons (400-300 nm) with a larger width of 1 relative to 3, whereas H2Pc[β/α-O(4-CF3-Ph)4] (2 and 4) molecules self-assembled into the wider microbelts (5-4 μm) of 2 relative to 4, showing the effect of the M center and the substituent positions of the Pc rings on the dimensions of the microstructures. An increased crystallinity is revealed in the order of 4 < 3 < 2 < 1, resulting in an increased conductivity in the same order. Towards NO2 and NH3, both positive and negative current changes are found among the sensors 1-4, with the lowest limit of detection (LOD) as low as 3 ppb to NO2 and 420 ppb to NH3 from 1, while positive current response to H2S is obtained only from 1 with a LOD of 100 ppb, respectively, achieving the best results for the room-temperature detection of NO2, NH3 and H2S gases based on all of solution-processed phthalocyanine-based sensors reported so far. Accordingly, the sensor responses are dominated by both M-analyst interaction (M=Co, 2H) and conductivity among the sensors 1-4. In particular, different sensor arrays consisting of the sensor of 1 combined with one of the other three sensors of 2-4 are established. NO2, NH3, H2S gases in ppb levels can be accurately identified by the combination of two parameters including current change direction and sensitivity

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Supplementary files

Article information


Submitted
22 Apr 2020
Accepted
29 Jun 2020
First published
30 Jun 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Phthalocyanine sensor array based on sensitivity and current changes for highly sensitive identification of three toxic gases in ppb levels

X. Duan, Y. Zhang, H. Wang, F. Dai, G. Yang and Y. Chen, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ02025G

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