Boron(B)doping serves as a promising strategy to enhance the quantum yield,photostability and environmental robustness of graphene quantum dots(GQDs).In this study,we reported a light-driven strategy for the facile sy...Boron(B)doping serves as a promising strategy to enhance the quantum yield,photostability and environmental robustness of graphene quantum dots(GQDs).In this study,we reported a light-driven strategy for the facile synthesis of boron-doped graphene quantum dots(B-GQDs).Specifically,under continuous stirring at room temperature,ultraviolet irradiation induces the progressive polymerization of o-phenylenediamine(o-PDA)precursors,resulting in the formation of GQDs;meanwhile,2-hydroxyphenylboronic acid(2-HPBA),acting as the B source,participates in the polymerization reaction with o-PDA intermediates,ultimately yielding B-GQDs.This approach significantly improves the technology of preparing QDs,yielding B-GQDs with a remarkably high fluorescence quantum yield of 71.2%.Detailed investigations reveal that the abundant surface functional groups on B-GQDs facilitate hydrogen-bonding interactions with water molecules,enabling their application as fluorescent probes for the quantitative detection of water content in various organic solvents.By integrating B-GQDs,a paper-based fluorescent sensor was successfully designed,achieving ultra-portable water content detection with excellent performance(0%-100%).展开更多
In the presence of room temperature ionic liquids based on 1 butyl 3 methylimidazolium salt and butylpyridinium salt, cycloaddition of propylene oxide and carbon dioxide without any additional organic solvents was inv...In the presence of room temperature ionic liquids based on 1 butyl 3 methylimidazolium salt and butylpyridinium salt, cycloaddition of propylene oxide and carbon dioxide without any additional organic solvents was investigated. It was found that both cations and anions of the room temperature ionic liquids have strong influence on the catalytic activity. The better catalytic performance was achieved with 1 butyl 3 methylimidazolium tetrafluoroborate as a catalyst. A suitable CO 2/propylene oxide molar ratio is needed for the reaction, and the conversion of propylene oxide increases with the increase of reaction temperature. The ionic liquid as a catalyst for such reaction can be recycled.展开更多
基金support from Sichuan Science and Technology Project(Nos.2023ZYD0034 and 2024NSFJQ0061)the State Key Lab of Geohazard Prevention&Geoenvironment Protection Independent Research Project(No.SKLGP 2023Z009).
文摘Boron(B)doping serves as a promising strategy to enhance the quantum yield,photostability and environmental robustness of graphene quantum dots(GQDs).In this study,we reported a light-driven strategy for the facile synthesis of boron-doped graphene quantum dots(B-GQDs).Specifically,under continuous stirring at room temperature,ultraviolet irradiation induces the progressive polymerization of o-phenylenediamine(o-PDA)precursors,resulting in the formation of GQDs;meanwhile,2-hydroxyphenylboronic acid(2-HPBA),acting as the B source,participates in the polymerization reaction with o-PDA intermediates,ultimately yielding B-GQDs.This approach significantly improves the technology of preparing QDs,yielding B-GQDs with a remarkably high fluorescence quantum yield of 71.2%.Detailed investigations reveal that the abundant surface functional groups on B-GQDs facilitate hydrogen-bonding interactions with water molecules,enabling their application as fluorescent probes for the quantitative detection of water content in various organic solvents.By integrating B-GQDs,a paper-based fluorescent sensor was successfully designed,achieving ultra-portable water content detection with excellent performance(0%-100%).
文摘In the presence of room temperature ionic liquids based on 1 butyl 3 methylimidazolium salt and butylpyridinium salt, cycloaddition of propylene oxide and carbon dioxide without any additional organic solvents was investigated. It was found that both cations and anions of the room temperature ionic liquids have strong influence on the catalytic activity. The better catalytic performance was achieved with 1 butyl 3 methylimidazolium tetrafluoroborate as a catalyst. A suitable CO 2/propylene oxide molar ratio is needed for the reaction, and the conversion of propylene oxide increases with the increase of reaction temperature. The ionic liquid as a catalyst for such reaction can be recycled.
