Journal of Cluster Science

, Volume 28, Issue 4, pp 2223–2238 | Cite as

Tannic Acid Stabilised Copper Nanocluster Developed Through Microwave Mediated Synthesis as a Fluorescent Probe for the Turn on Detection of Dopamine

Original Paper


The authors report on the development of copper nanocluster stabilized with tannic acid (TA CuNC) as a fluorescent nanoprobe for the turn on detection of a catecholamine neurotransmitter, dopamine. The nanocluster is obtained through a microwave assisted synthesis and exhibit distinct blue emission peak at 450 nm during excitation at 370 nm. The luminescence in the present system is effectively quenched by Fe(III) ions. The quenching happens through an electron transfer mechanism, which operate between the nanocluster and Fe(III) ions. The quenching is linear proportional to the concentration of Fe(III) between 0.25 and 1 μM and the detection limit is as low as 1.28 nM. Addition of dopamine into the quenched system causes the removal Fe(III) ions from the cluster surface and thereby leads to the retrieval of luminescence. The quenched system exhibited high sensitivity and selectivity for dopamine with a limit of detection 45 nM. The adaptability of the nanocluster as a turn on fluorescent probe is tested in real samples for the detection of dopamine and the recovery of fluorescence is in the range of 95%.


Tannic acid Copper nanocluster Ferric ions Fluorescence probe Dopamine 



The authors thank the Head, Department of Chemistry, University of Kerala (Kariavattom Campus), Thiruvananthapuram, Director, SAIF-STIC-CUSAT (Kochi), and the Director, Instrumentation Centre, M. G. University (Kottayam) the for the sophisticated characterization techniques provided for the work.

Supplementary material

10876_2017_1221_MOESM1_ESM.docx (646 kb)
Supplementary material 1 (DOCX 649 kb)


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Department of Chemistry, School of Physical and Mathematical SciencesUniversity of KeralaThiruvananthapuramIndia
  2. 2.Department of ChemistryUniversity CollegeThiruvananthapuramIndia

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