Abstract
Recently, natural products are the powerful carbon source to synthesize carbon dots (CDs) with interesting physical and chemical properties. In this present work, we report a facile hydrothermal synthesis method for preparing fluorescent carbon dots using a biogenic precursor of rice bran without any surface passivation agent. The synthetic methodology was easy, simple, environmental friendly and convenient. Structural and optical properties of the RB-CDs have been studied by UV-visible, Fourier transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), Fluorescence spectra and X-ray photoelectron spectroscopy (XPS) techniques. The prepared RB-CDs exhibited green emission upon irradiation with UV light and the calculated fluorescence quantum yield (QY) was found to be 7.4%. The morphological features of the synthesized RB-CDs were characterized by High-Resolution Transmission Electron Microscopy (HR-TEM), the average size of the RB-CDs was found to be 2.96 nm. The synthesized RB-CDs were beneficially applied as a catalyst for the catalytic degradation of methylene blue (MB) dye using NaBH4 as the reducing agent in the ambient conditions. The degradation of MB dye under light illumination was 89.20% in 30 min. Further, the obtained highly fluorescent RB-CDs were efficiently utilized as a fluorescent ink for luminescent pattern printing (patterning agent) in the anti-counterfeiting applications.
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Acknowledgments
The authors wish to acknowledge DST-FIST (fund for improvement of S&T) for the financial assistance at the Department of Chemistry, SRM Institute of Science and Technology (grant no. SR/FST/CST-266/2015(c)).
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Vinoth Kumar Jothi: Conceptualization, Methodology, Writing – original draft. Kavitha Ganesan: Data curation, Formal analysis. Arulmozhi Rajaram: Visualization. Abirami Natarajan: Supervision, Investigation.
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Jothi, V.K., Ganesan, K., Natarajan, A. et al. Green Synthesis of Self-Passivated Fluorescent Carbon Dots Derived from Rice Bran for Degradation of Methylene Blue and Fluorescent Ink Applications. J Fluoresc 31, 427–436 (2021). https://doi.org/10.1007/s10895-020-02652-6
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DOI: https://doi.org/10.1007/s10895-020-02652-6