Table of Contents
Journal of Nanoparticles
Volume 2014 (2014), Article ID 178518, 8 pages
Research Article

Carbon Dot Based Sensing of Dopamine and Ascorbic Acid

1Material Nanochemistry Laboratory, Institute of Advanced Study in Science and Technology, Paschim Boragaon, Garchuk, Guwahati 781035, India
2Department of Chemistry, Assam Engineering College, Jalukbari, Guwahati 781035, India

Received 29 August 2014; Revised 3 December 2014; Accepted 3 December 2014; Published 29 December 2014

Academic Editor: Shu Taira

Copyright © 2014 Upama Baruah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We demonstrate carbon dot based sensor of catecholamine, namely, dopamine and ascorbic acid. Carbon dots (CDs) were prepared from a green source: commercially available Assam tea. The carbon dots prepared from tea had particle sizes of ∼0.8 nm and are fluorescent. Fluorescence of the carbon dots was found to be quenched in the presence of dopamine and ascorbic acid with greater sensitivity for dopamine. The minimum detectable limits were determined to be 33 μM and 98 μM for dopamine and ascorbic acid, respectively. The quenching constants determined from Stern-Volmer plot were determined to be 5 × 10−4 and 1 × 10−4 for dopamine and ascorbic acid, respectively. A probable mechanism of quenching has been discussed in the paper.