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Controllable Synthesis of Carbon Dots with Excitation‐Wavelength‐Dependent or Independent Photoluminescence for the Selective and Sensitive Detection of Co 2+ Ions
Author(s) -
Wang Lanhui,
Lin Kui,
Trinchi Adrian,
Cole Ivan S.,
Tian Fei
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802784
Subject(s) - photoluminescence , polyethylenimine , ethylenediaminetetraacetic acid , citric acid , excitation , fluorescence , sodium borohydride , ion , materials science , chelation , chemistry , wavelength , carbon fibers , photochemistry , analytical chemistry (journal) , inorganic chemistry , optoelectronics , organic chemistry , optics , transfection , biochemistry , physics , composite number , electrical engineering , composite material , gene , engineering , catalysis
Fluorescent carbon dots (CDs) with excitation‐wavelength‐dependent and excitation‐wavelength‐independent emission have been prepared with varying amounts citric acid (CA), ethylenediamin end‐capped polyethylenimine (PEI‐EC) and sodium borohydride (NaBH 4 ), their structure, optical and chemical sensing properties have been also systematically investigated. The varying of NaBH 4 and PEI‐EC renders the structure and surface state change as well as photoluminescence (PL) properties. The results indicated that NaBH 4 made the CDs sensitive to Co 2+ ions, whilst the PEI‐EC served to increase their sensitivity. The synergistic roles that both NaBH 4 and PEI‐EC played on the selective and sensitive detection of Co 2+ were achieved via a simple adjustment of the mass ratios during synthesis. Furthermore, the PL intensity was gradually recovered until completely restored with the addition of chelating agent ethylenediaminetetraacetic acid (EDTA) to the Co 2+ quenched CDs solutions. This work provided quantitatively preparation and controllable synthesis of excitation‐wavelength‐dependent or independent CDs for the development of PL based sensors.