Issue 69, 2014
From the journal:

RSC Advances

Reversible on/off switching of fluorescence via esterification of carbon dots†

Upama Baruah,a   Manash Jyoti Dekaa  and  Devasish Chowdhury*a  

* Corresponding authors

a Material Nanochemistry Laboratory, Physical Sciences Division, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India
E-mail: devasish@iasst.gov.in
Fax: +91 361 2279909
Tel: +91 361 291207

Abstract

We demonstrate a simple, facile, and reversible on/off fluorescence switching by functionalization of carbon dots (CDs) via esterification. The CDs synthesized from citric acid show pH-dependent photoluminescence (PL), with higher PL intensity observed at pH 7 than at pH 1. The hydroxyl and carboxyl group-bearing CDs were also esterified with different alcohols, and their PL properties were studied. It is interesting to note that in all the cases, low PL intensity of CDs at pH 1 can be transformed into a high PL system by esterification of CDs. However, at neutral pH 7, the PL intensity was found to be lower after esterification of CDs. Moreover, at pH 1, the subsequent hydrolysis of esterified CDs again results in low PL intensity, thereby demonstrating the reversibility of the process.

Graphical abstract: Reversible on/off switching of fluorescence via esterification of carbon dots

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Article information

DOI
https://doi.org/10.1039/C4RA04734F
Article type
Paper
Submitted
20 May 2014
Accepted
04 Aug 2014
First published
05 Aug 2014

RSC Adv., 2014,4, 36917-36922

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Reversible on/off switching of fluorescence via esterification of carbon dots

U. Baruah, M. J. Deka and D. Chowdhury, RSC Adv., 2014, 4, 36917 DOI: 10.1039/C4RA04734F

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