Facile one-pot synthesis of self-assembled nitrogen-doped carbon dots/cellulose nanofibril hydrogel with enhanced fluorescence and mechanical properties

The preparation and functionalization of biomass-based hydrogels that can be used in the field of biomedicine have received an increasing amount of attention. Carbon dots are a kind of fluorescent carbon nanomaterial with stable fluorescence emission and low biotoxicity, therefore the introduction o...

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Bibliographic Details
Published in:Green chemistry : an international journal and green chemistry resource : GC 2020-05, Vol.22 (1), p.3296-338
Main Authors: Chen, Xueqi, Song, Zihui, Li, Shaopeng, Tat Thang, Nguyen, Gao, Xing, Gong, Xinchao, Guo, Minghui
Format: Article
Language:English
Subjects:
Acid resistance
Biocompatibility
Biomass
Biomedical materials
Carbon
Carbon dots
Cellulose
Compressive strength
Electron microscopy
Emissions
Fabrication
Fluorescence
Fluorescence spectroscopy
Fourier transforms
Gels
Green chemistry
Hydrogels
Hydrothermal treatment
Infrared spectroscopy
Mechanical properties
Mechanical tests
Nanomaterials
Nitrogen
Rheological properties
Rheology
Self-assembly
Spectrum analysis
X-ray diffraction
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Summary:The preparation and functionalization of biomass-based hydrogels that can be used in the field of biomedicine have received an increasing amount of attention. Carbon dots are a kind of fluorescent carbon nanomaterial with stable fluorescence emission and low biotoxicity, therefore the introduction of carbon dots into the biomass-based hydrogel can make it have a broader application prospect. In this work, fluorescent nitrogen-doped carbon dots/cellulose nanofibril composite hydrogel (NCDs/CNF-gel) with exceptional mechanical properties was successfully fabricated by a facile one-pot green hydrothermal treatment. The properties of NCDs/CNF-gel prepared at different temperatures and CNF concentrations were investigated by electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, fluorescence spectroscopy, rheology, and mechanical tests. NCDs/CNF-gel with injectable, pressure-resistance and excellent fluorescence properties can be obtained by controlling the hydrothermal treatment temperature. Furthermore, the self-assembly mechanism of NCDs in the hydrogel network and the improvement mechanism of hydrogel compressive strength were explored. The NCDs/CNF-gel exhibited acid-resistant and alkaline sensitive blue-green fluorescent emission. The outstanding biocompatibility, excellent fluorescence and mechanical properties of NCDs/CNF-gels, and their facile fabrication render these so-prepared gels promising candidates for future biomedical applications. A facile one-pot method is used to synthesize and self-assemble nanofibril cellulose hydrogels with carbon dots as intensity enhancement and fluorescent emission factors.
ISSN:1463-9262
1463-9270
DOI:10.1039/d0gc00845a