Synthesis of a carbon-dot-based photoluminescent probe for selective and ultrasensitive detection of Hg2+ in water and living cells

Sasmita Mohapatra; Swagatika Sahu; Niharika Sinha; Sujit K. Bhutia

doi:10.1039/C4AN01386G

Synthesis of a carbon-dot-based photoluminescent probe for selective and ultrasensitive detection of Hg²⁺ in water and living cells

Sasmita Mohapatra,*^a Swagatika Sahu,^a Niharika Sinha^b and Sujit K. Bhutia^b

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* Corresponding authors

^a Department of Chemistry, National Institute of Technology, Rourkela 769008, India
E-mail: sasmitam@nitrkl.ac.in

^b Department of Life Science, National Institute of Technology, Rourkela 769008, India

Abstract

A nitrogen and sulphur co-doped carbon dot (NSCD) based highly selective photoluminescent probe for mercury detection has been designed. The NSCDs with a PL quantum yield of 69% are easily prepared from a single polymeric molecular precursor. The turn on-off fluorescence change upon mercury addition is attributed to the nonradiative electron transfer from the excited state to the d-orbital of the metal ion. The soft–soft acid–base interaction between the sulphur part of the NSCD and Hg²⁺ makes the fluorescence probe more specific and selective towards Hg²⁺ in contrast to other metal ions. The limit of detection of mercury ions is found to be 0.05 nM. Due to their high photostability, low toxicity and low detection limit, these carbon dots are demonstrated to be excellent probes for the detection of Hg²⁺ in the living cell.

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Publication details

The article was received on 28 Jul 2014, accepted on 30 Nov 2014 and first published on 01 Dec 2014

Article type: Paper

DOI: 10.1039/C4AN01386G

Citation: Analyst, 2015,140, 1221-1228

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Synthesis of a carbon-dot-based photoluminescent probe for selective and ultrasensitive detection of Hg²⁺ in water and living cells

S. Mohapatra, S. Sahu, N. Sinha and S. K. Bhutia, Analyst, 2015, 140, 1221
DOI: 10.1039/C4AN01386G
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Synthesis of a carbon-dot-based photoluminescent probe for selective and ultrasensitive detection of Hg²⁺ in water and living cells

Abstract

Supplementary files

Publication details

Synthesis of a carbon-dot-based photoluminescent probe for selective and ultrasensitive detection of Hg²⁺ in water and living cells

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