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Synthesis of green-emitting carbon quantum dots with excitation wavelength dependent photoluminescence obtained from aqueous beetroot extract

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Abstract

In this work, 3 simple, fast, labour and energy efficient methodologies were used to prepare carbon quantum dots (C-dots) using a red beetroot (Beta vulgaris subsp. vulgaris var. vulgaris) aqueous extract as the carbon source: alkali-assisted (AA), microwave-assisted (MA) and alkali-microwave-assisted (AMA) synthesis. TEM images shows nanoparticles with a nearly spherical morphology and diameters around 7.0 nm. FTIR spectra show characteristic peaks of C-H, C-O, O-H and C=C bonds for all the samples. The emission spectra show an interesting feature of the as-prepared samples: the emission band position can be tunable by changing the excitation wavelength. Comparing the 3 different methodologies in terms of photoluminescence properties, the one based only on the microwave-assisted heating has showed the most improved emission.

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Authors and Affiliations

  1. Postgraduate Program in Materials Science and Engineering, Federal University of Sergipe, São Cristóvão, SE, Brazil

    George R. S. Andrade, Cristiane C. Nascimento & Iara F. Gimenez

  2. Postgraduate Program in Chemistry, Federal University of Bahia, Salvador, BA, Brazil

    Silvânio S. L. Costa

  3. NUPEG, Federal University of Sergipe, São Cristóvão, SE, Brazil

    Silvânio S. L. Costa

  4. Federal Institute of Education, Science and Technology of Sergipe, Aracaju, SE, Brazil

    Cristiane C. Nascimento

  5. Department of Chemistry, Federal University of Sergipe, São Cristóvão, SE, Brazil

    Iara F. Gimenez

Authors
  1. George R. S. Andrade
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  2. Silvânio S. L. Costa
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  3. Cristiane C. Nascimento
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  4. Iara F. Gimenez
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Andrade, G.R.S., Costa, S., Nascimento, C.C. et al. Synthesis of green-emitting carbon quantum dots with excitation wavelength dependent photoluminescence obtained from aqueous beetroot extract. MRS Advances 1, 1371–1376 (2016). https://doi.org/10.1557/adv.2016.195

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  • DOI: https://doi.org/10.1557/adv.2016.195

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