Journal
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
Volume 7, Issue -, Pages 758-766Publisher
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.7.67
Keywords
carbon dots; carbon onions; metal-ion sensing; photoluminescence; thermal carbonization
Funding
- Ministerio de Economia y Competitividad
- Fondo Europeo de Desarrollo Regional (FEDER) [MAT2012-33690]
- Erasmus Mundus Medastar grant
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Carbonization of tomatoes at 240 degrees C using 30% (w/v) NaOH as catalyst produced carbon onions (C-onions), while solely carbon dots (C-dots) were obtained at the same temperature in the absence of the catalyst. Other natural materials, such as carrots and tree leaves (acer saccharum), under the same temperature and alkaline conditions did not produce carbon onions. XRD, FTIR, HRTEM, UV-vis spectroscopy, and photoluminescence analyses were performed to characterize the as-synthesized carbon nanomaterials. Preliminary tests demonstrate a capability of the versatile materials for chemical sensing of metal ions. The high content of lycopene in tomatoes may explain the formation of C-onions in alkaline media and a possible formation mechanism for such structures was outlined.
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