Controllable Synthesis of Carbon Dots with Excitation-Wavelength-Dependent or Independent Photoluminescence for the Selective and Sensitive Detection of Co2+ Ions

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Wang, Lanhui
Lin, Kui
Trinchi, Adrian
Cole, Ivan S
Tian, Fei
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2018
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Abstract

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.

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ChemistrySelect

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3

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42

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Chemical sciences

Science & Technology

Physical Sciences

Chemistry, Multidisciplinary

Chemistry

Carbon dots

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Wang, L; Lin, K; Trinchi, A; Cole, IS; Tian, F, Controllable Synthesis of Carbon Dots with Excitation-Wavelength-Dependent or Independent Photoluminescence for the Selective and Sensitive Detection of Co2+ Ions, ChemistrySelect, 2018, 3 (42), pp. 11791-11799

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