Preparation and Characterization of Composites of Amine-functionalized Carbon Dots and Zinc Phthalocyaine†

doi:10.7503/cjcu20140930

Abstract

Abstract:

Amine-functionalized carbon dots(N-CDs) and zinc phthalocyaine(PcZn) were combined by electrostatic bonding under the mechanical stirring, resulting in a new composite, i.e. N-CDs/PcZn. The photoinduced excited electron transfer via the interface between N-CDs and PcZn was determined through fluorescence spectra, UV-Vis absorption spectra, infrared spectra and cyclic voltammetry. The excited electrons of N-CDS were transfered onto the PcZn molecules and then relaxed by radiative recombination, causing the enhanced fluorescence emission of PcZn. On the other hand, the separation of electron-hole pair on N-CDs was realized and thus limited the possibility of radiative combination on N-CDs. Therefore, the composite of N-CDs/PcZn showed a high photocatalytic activity. Moreover, the stability and the photon conversion ability of N-CDs/PcZn composites depended on the reaction temperature. The experimental results suggest that room temperature is the optimum to obtain composite with good performance.

Key words: Carbon dots, Zinc phthalocyaine, Electronic transfer, Fluorescent property, Photocatalytic property

CLC Number:

O613
O657

TrendMD:

DING Yanli, HU Shengliang, CHANG Qing. Preparation and Characterization of Composites of Amine-functionalized Carbon Dots and Zinc Phthalocyaine^†[J]. Chem. J. Chinese Universities, 2015, 36(4): 619.

Figures/Tables 9

Fig.1 UV-Vis spectra(A) and photocatalytic activities toward MB degradation(B) of N-CDs(a), PcZn(b) and S1(c)

Fig.2 IR spetra of N-CDs, PcZn, S1(A) and TEM image of S1(B)

Fig.3 Dependence of fluorescence emission from the given PcZn(excited at 600 nm) on the concentrations of N-CDs(A) and from the given N-CDs(excited at 400 nm) on concentrations of PcZn(B) (A) Volume of PcZn solution is 1 mL. Volume of N-CDs solution/mL: a. 0; b. 1; c. 3; d. 4.(B) Volume of N-CDs solution is 1 mL. Volume of PcZn solution/mL: a. 0; b. 1; c. 3; d. 4.

Fig.4 CV curves of N-CDs(A) and PcZn(B) in 0.1 mol/L TBAP

Fig.5 Schematic of the photoinduced charge behavior of the N-CDs/PcZn system excited at the visible light

Fig.6 UV-Vis spectra(A) and photocatalytic activities(B) of samples S1—S5

Fig.7 IR spectra of samples S1(a) and S5(b)

Fig.8 Effects of the standing time of N-CDs, PcZn, S1 and S5 on fluorescence emission intensities excited at 400 nm(A) and 600 nm(B), respectively

Fig.9 Fluorescence emission spectra(excited at 600 nm) of samples S1(A) and S5(B) with different standing time

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