Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 26, Issue 6, Pages 1274-1282Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.5935/0103-5053.20150094
Keywords
carbon quantum dots; cashew gum; microwave-assisted synthesis; photoluminescence
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Funding
- National Institute for Science and Technology (INCT-INOMAT)
- CNPq
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Carbon quantum dots (C-dots) with average size of 9 nm were synthesized from an aqueous solution of raw cashew gum (RCG) using a novel and fast microwave-assisted technique which involves two steps. In the first step (partial depolymerization in solution) some monomer units are formed through the autohydrolysis of CG and a small amount of 5-hydroxymethyl furfural can be obtained. The second step involves polycondensation/polymerization to give rise to a polyfuranic structure followed by aromatization/carbonization and nuclear burst. At the end of the process a composite of partially depolymerized CG and C-dot was formed. A mechanism involved in microwave-assisted two-steps synthesis was suggested. Although no passivation reagent was used, an intensely blue photoluminescent material in UV light was obtained. C-dot was characterized by spectroscopy in the medium infrared, thermal analysis, gel permeation chromatography, transmission electron microscopy, zeta potential, and photoluminescence.
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