P2O5 assisted green synthesis of multicolor fluorescent water soluble carbon dots

Babar, Dipak Gorakh ; Sonkar, Sumit Kumar ; Tripathi, Kumud Malika ; Sarkar, Sabyasachi (2014) P2O5 assisted green synthesis of multicolor fluorescent water soluble carbon dots Journal of Nanoscience and Nanotechnology, 14 (3). pp. 2334-2342. ISSN 1533-4880

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Official URL: http://www.aspbs.com/jnn/

Related URL: http://dx.doi.org/10.1166/jnn.2014.8487


A low cost synthesis of multicolor fluorescent carbon dots (C-dots) from edible sugars is described here. Common sugars like dextrose, lactose or maltose in aqueous medium gets dehydrated using phosphorus pentoxide (P2O5). The reaction is facile and completed within few minutes to form insoluble carbon (C-dots) mostly having the graphitic (G-band, Raman) sp2 hybridized carbon atoms (C-atoms). This insoluble carbon on oxidative treatment with nitric acid produced disordered sp3 (D-band retaining G-band, Raman) hybridized C-atoms, originated from the graphitic pool with sp2 hybridized C-atoms. This high density assimilation of self passivated “surfacial defects” become emissive during electronic transitions. Surfacial defects due to high degree of electrophilic carboxylation create the water soluble version of multicolor fluorescent C-dots as “water soluble fluorescent carbon dots” (wsFCDs). wsFCDs being itself self-passivated imposes the tunable multicolor emission throughout the visible spectrum without having any external coating and surface passivation and could be used as multicolor fluorescent probe especially in the emerging field of optical bio-imaging.

Item Type:Article
Source:Copyright of this article belongs to American Scientific Publishers.
ID Code:98295
Deposited On:14 May 2014 09:18
Last Modified:14 May 2014 09:18

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