Microwave Synthesis of Glycerol Carbon Quantum Dots and Its Application in Fe3+ Probe†

doi:10.7503/cjcu20150436

Abstract

Abstract:

Glycerol was selected as sole starting material by one step microwave method for prepared a new type of carbon quantum dots(CDs). The size of th CDs distribute in 4—25 nm with the average particle size of 16.5 nm. In addition, the resulting CDs could exhibit a highly sensitive fluorescence response behavior to Fe³⁺compared to other 13 kinds of metal ions including Cu²⁺, Ca²⁺, Zn²⁺, Co²⁺, Fe²⁺, Ni²⁺, Mn²⁺, Na⁺, Cd²⁺, Mg²⁺, Pb²⁺, K⁺ and Ag⁺. The detection limit of Fe³⁺was calculated to be 2 μmol/L with a linear dynamic range of 10—60 μmol/L.

Key words: Microwave-assisted technique, Carbon quantum dots, Fluorescence spectrum, Fe3+

CLC Number:

O626
O613.71

TrendMD:

ZHANG Jing, JIANG Yuliang, CHENG Yu, GU Weijin, WANG Bingxiang. Microwave Synthesis of Glycerol Carbon Quantum Dots and Its Application in Fe³⁺ Probe^†[J]. Chem. J. Chinese Universities, 2016, 37(1): 54.

Figures/Tables 9

Fig.1 TEM image of CDs

Fig.2 Emission(a) and excitation(b) spectra of the CDs^λex=360 nm; λem=450 nm.

Fig.3 Fluorescence spectra of CDs solution^λex/nm: a. 360; b. 370; c. 380; d. 390; e. 400; f. 410; g. 420; h. 430.

Fig.4 Various fluorescence intensity ratios of the CDs solution in the absence and presence of various individual metal ions^F0 and F are the fluorescence intensity at 360 nm in the absence and presence of ions, respectively. a. Fe3+; b. Na+; c. Pb2+; d. Cd2+; e. Ca2+; f. Co2+; g. K+; h. Mn2+; i. Ni2+; j. Cu2+; k. Ag+; l. Mg2+; m. Zn2+; n. Fe2+.

Fig.5 Fluorescence spectra of 1.0×10-5 mol/L CDs solution with increasing amounts of Fe3+^c(Fe3+) of curve a—k. 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 μmol/L, respectively. Inset: the photo of CDs under irradiated by 365 nm light before and after addition of Fe3+.

Fig.6 Represent fluorescence intensity response of CDs to the concentration of Fe3+ over the range from 10 to 100 μmol/L

Fig.7 Linear relationship between CDs and Fe3+ over the range from 10 to 60 μmol/L ^λex=360 nm.

Fig.8 Fluorescence spectrum of 1.0×10-5 mol/L CDs and 100 μL Fe3+ with time lasting

Scheme 1 Possible mechanism of CDs to Fe3+

References 26

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Microwave Synthesis of Glycerol Carbon Quantum Dots and Its Application in Fe³⁺ Probe^†

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