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Understanding the Photoluminescence Mechanism of Nitrogen‐Doped Carbon Dots by Selective Interaction with Copper Ions
Author(s) -
Ganiga Manjunatha,
Cyriac Jobin
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201600294
Subject(s) - photoluminescence , ion , doping , fluorescence , exciton , copper , materials science , carbon fibers , detection limit , nitrogen , nanotechnology , analytical chemistry (journal) , chemical physics , photochemistry , optoelectronics , chemistry , optics , physics , environmental chemistry , condensed matter physics , organic chemistry , chromatography , composite number , metallurgy , composite material
Doped fluorescent carbon dots (CDs) have drawn widespread attention because of their diverse applications and attractive properties. The present report focusses on the origin of photoluminescence in nitrogen‐doped CDs (NCDs), which is unraveled by the interaction with Cu 2+ ions. Detailed spectroscopic and microscopic studies reveal that the broad steady‐state photoluminescence emission of the NCDs originates from the direct recombination of excitons (high energy) and the involvement of defect states (low energy). In addition, highly selective detection of Cu 2+ is achieved, with a detection limit of 10 μ m and a dynamic range of 10 μ m –0.4 m m . The feasibility of the present sensor for the detection of Cu 2+ in real water samples is also presented.