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A Facile Preparation of Multicolor Carbon Dots
Risheng Yu1, Sen Liang1, Yi Ru1
1Department of Optical Engineering, Zhejiang Prov Key Lab Carbon Cycling Forest Ecosy, College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Zhejiang A&F University, Hangzhou, 311300, China.
Nanoscale Research Letters
|March 8, 2022
Summary
Researchers developed tunable carbon dots (CDs) using a solvothermal method. Changing the water to N,N-dimethylformamide (DMF) ratio altered their fluorescence color, showing potential for lighting applications.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Carbon dots (CDs) are promising fluorescent materials for applications like photocatalysis and bioimaging.
- The influence of preparation solvents on the optical properties of CDs remains incompletely understood.
- Solvent effects during synthesis can significantly alter the fluorescence emission characteristics of nanomaterials.
Purpose of the Study:
- To investigate the impact of solvent composition on the preparation of carbon dots (CDs).
- To achieve color-tunable fluorescence emission in CDs by varying the water to N,N-dimethylformamide (DMF) ratio.
- To explore the potential of these multicolor CDs in lighting applications.
Main Methods:
- A one-pot solvothermal synthesis route was employed using citric acid and thiourea as precursors.
- The volume ratio of water to N,N-dimethylformamide (DMF) was systematically varied during synthesis.
- Characterization techniques included Transmission Electron Microscopy (TEM), Raman spectroscopy, and X-ray Photoelectron Spectroscopy (XPS).
Main Results:
- Color-tunable carbon dots (CDs) with emission wavelengths ranging from 450 to 640 nm were successfully synthesized.
- Increasing the DMF to water ratio led to larger particle sizes and higher surface functional group content (C-N/C-S and C≡N bonds).
- The red-shift in optimal emission wavelength correlated with increased DMF content and larger CD particle size.
Conclusions:
- The solvent composition, specifically the water to DMF ratio, is a critical factor in controlling the optical properties of carbon dots.
- The observed changes in particle size and surface chemistry directly influence the fluorescence emission wavelength.
- The synthesized multicolor carbon dots demonstrate significant potential for advanced lighting applications.
