期刊
RSC ADVANCES
卷 11, 期 11, 页码 5993-6001出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ra08832c
关键词
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资金
- National Natural Science Foundation of China [51202061]
- Natural Science Foundation of Heilongjiang Province of China [2019LH0320]
- Innovative Talents Program of Harbin [2017RAQXJ143]
This study achieved the peripheral and non-peripheral substitution of 4-trifluoromethylphenoxy groups in gas sensing phthalocyanine cobalt/reduced graphene oxide hybrids. The 4-cF(3)poPcCo/rGO sensor demonstrated better sensitivity, selectivity, and reproducibility towards hydrogen sulfide, with a strong linear response to concentration.
The peripheral and non-peripheral substitution of 4-trifluoromethylphenoxy groups in the design of gas sensing phthalocyanine cobalt/reduced graphene oxide (rGO) hybrids with two different positions of the substituents was realized. Tetra-alpha(beta)-(4-trifluoromethylphenoxy)phthalocyanine cobalt/reduced graphene oxide (3(4)-cF(3)poPcCo/rGO) hybrids were prepared through noncovalent interaction, and were analyzed by FT-IR, UV-vis, TGA and SEM. The gas sensing performance of the cF(3)poPcCo/rGO hybrid gas sensors towards ppb hydrogen sulfide (H2S) was measured at room temperature. The results show that the 4-cF(3)poPcCo/rGO sensor has better sensitivity, selectivity and reproducibility than the 3-cF(3)poPcCo/rGO sensor, as well as a perfect linear response to the concentration of H2S. For the 4-cF(3)poPcCo/rGO sensor, the response sensitivity to 1 ppm H2S is as high as 46.58, the response and recovery times are 600 s and 50 s for 1 ppm H2S, and the detection limit is as low as 11.6 ppb. This is mainly due to the loose and porous structure of the cF(3)poPcCo/rGO hybrids, the fact that graphene is an excellent conductive agent, and the fact that the electron-withdrawing capability of the trifluoromethyl group can increase the holes of rGO and PcCo. In addition, through electrochemical impedance spectroscopy (EIS) and I-V curves, and density functional theory, the influence of different positions of the substituents of cF(3)poPcCo/rGO on the sensing performance and the sensing mechanism for improving sensitivity were discussed and confirmed in detail.
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