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

Published online by Cambridge University Press:  14 March 2016

George R. S. Andrade ,
Silvânio S. L. Costa ,
Cristiane C. Nascimento  and
Iara F. Gimenez
George R. S. Andrade*
Affiliation:
Postgraduate Program in Materials Science and Engineering, Federal University of Sergipe, São Cristóvão, SE, Brazil
Silvânio S. L. Costa
Affiliation:
Postgraduate Program in Chemistry, Federal University of Bahia, Salvador, BA, Brazil. NUPEG, Federal University of Sergipe, São Cristóvão, SE, Brazil.
Cristiane C. Nascimento
Affiliation:
Postgraduate Program in Materials Science and Engineering, Federal University of Sergipe, São Cristóvão, SE, Brazil Federal Institute of Education, Science and Technology of Sergipe, Aracaju, SE, Brazil
Iara F. Gimenez
Affiliation:
Postgraduate Program in Materials Science and Engineering, Federal University of Sergipe, São Cristóvão, SE, Brazil Department of Chemistry, Federal University of Sergipe, São Cristóvão, SE, Brazil.
*
*(Email: grsandrade@hotmail.com)
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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.

Keywords

colloidluminescencemicrowave heating

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Type
Articles
Information
MRS Advances , Volume 1 , Issue 19: Nanomaterials and Synthesis , 2016 , pp. 1371 - 1376
Copyright
Copyright © Materials Research Society 2016 

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