Issue 60, 2014

Induction coil heater prepared highly fluorescent carbon dots as invisible ink and explosive sensor

Abstract

We report a new and facile method for the synthesis of highly fluorescent carbon dots (Cdots) using a commercially available induction coil heater. An aqueous solution of citric acid and a diamine compound was heated at 100 °C for 12–15 min, upon which the Cdots were produced. The Cdots, with an average size of less than 5 nm (produced when ethylenediamine was used), emitted a blue light with a high quantum yield when excited under UV light. The quantum yield was dependent on the nature of diamine and was as high as 73.5% for ethylenediamine. The as-prepared Cdots could be easily converted into a gel by mixing with chitosan biopolymer. The gel could be used for filling up the refill of a ball-point pen and can be used for UV-active marking, for sensing of explosive compounds (such as picric acid and 2,4-dinitrophenol) with high efficiency and for other fluorescence based applications. The use of a commercial induction coil heater, scalability and high chance of commercial viability make the method particularly appealing.

Graphical abstract: Induction coil heater prepared highly fluorescent carbon dots as invisible ink and explosive sensor

Supplementary files

Article information

Article type
Paper
Submitted
08 May 2014
Accepted
18 Jun 2014
First published
18 Jun 2014

RSC Adv., 2014,4, 31994-31999

Induction coil heater prepared highly fluorescent carbon dots as invisible ink and explosive sensor

M. P. Sk and A. Chattopadhyay, RSC Adv., 2014, 4, 31994 DOI: 10.1039/C4RA04264F

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