Self-carbonization synthesis of highly-bright red/near-infrared carbon dots by solvent-free method

In biosensing and biophotonics, red/near-infrared fluorescent carbon dots (R-CDs) are attractive and deserve more attention. However, the synthesis and purification of R-CDs are time-consuming, impeding their industrial production and application on a large scale. We proposed a solvent-free method f...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2022-02, Vol.1 (8), p.3153-3162
Main Authors: Zhang, Zeyu, Chen, Xiaoyong, Fang, Guocheng, Wu, Jiajie, Gao, Aolong
Format: Article
Language:English
Subjects:
Additives
Carbon
Carbon dots
Carbonation
Dehydration
Fluorescence
Glucose
High temperature
Near infrared radiation
Oxidation
Precursors
Raw materials
Reagents
Solvents
Synthesis
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Summary:In biosensing and biophotonics, red/near-infrared fluorescent carbon dots (R-CDs) are attractive and deserve more attention. However, the synthesis and purification of R-CDs are time-consuming, impeding their industrial production and application on a large scale. We proposed a solvent-free method for reducing the number of raw materials used in the R-CD synthesis by utilizing the dehydration self-carbonation effect of the-HSO 3 group in the precursor. The synthesized R-CDs exhibit a quantum yield of 59% and an emission wavelength of 600-800 nm with only one raw material (3,4-diaminobenzenesulfonic acid) and without the addition of any extra precursors, solvents, catalysts, dehydration agent, or other additives. We hypothesized that the red/near-infrared emission was caused by carbon-nucleus conjugated structures formed during the dissociation of the -HSO 3 group at high temperatures. Additionally, the prepared R-CDs demonstrated a good response to the products of glucose oxidation, indicating glucose's sensing capability. Additionally, the synthesized R-CDs demonstrated excellent single-photon imaging of cells while being non-toxic, demonstrating their enormous potential in biophotonics. We believe that this simple and environmentally friendly R-CD synthesis can significantly accelerate industrialization and application. The optical photographs and reaction mechanism of self-catalysis synthesis of R-CDs by a solvent-free method.
ISSN:2050-7526
2050-7534
DOI:10.1039/d1tc05782k