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Citation: FANG Jingmei, LIU Liqin, ZHAO Xijuan, LI Yuanfang. Interaction Between Aluminium(Ⅲ) Cation and Hydroxyl Functionalized Fluorescent Carbon Dots[J]. Chinese Journal of Applied Chemistry, ;2013, 30(10): 1144-1148. doi: 10.3724/SP.J.1095.2013.20557 shu

Interaction Between Aluminium(Ⅲ) Cation and Hydroxyl Functionalized Fluorescent Carbon Dots

Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering Southwest University, Chongqing 400715, China

Received Date: 30 November 2012
Revised Date: 4 February 2013

The interaction between aluminium(Ⅲ) cation (Al³⁺) and hydroxyl functionalized carbon dots (CDs) was studied through the fluorescence spectra. Upon the addition of increasing amounts of Al³⁺ in the range of 0.2~8 μmol/L,the fluorescence of CDs quenched gradually. Further increasing the concentration of Al³⁺,the quenched fluorescence could be recovered. By employing the dynamic light scattering (DLS) and Zeta potential,we proposed a plausible mechanism for the observed phenomena. At lower concentration of Al³⁺,Al³⁺ can easily coordinate with hydroxyl groups on the surface of CDs,the distance among neighboring CDs was then shortened,which causes the aggregation of CDs and quenching of fluorescent CDs. Further increasing the concentration of Al³⁺,the hydroxyl groups of CDs were completely coordinated with Al³⁺. In such case,the charges of CDs changed from negative to positive. Owing to the repulsion of the positive charges,the aggregated CDs tend to dissolve and the fluorescence of CDs can be recovered. Although Cr³⁺ and Fe³⁺ can also coordinate with hydroxyl groups,our experimental results show that they just have strong fluorescence quenching effects on CDs but no fluorescence recovery phenomena. This is probably ascribed to the fact that Al³⁺ can form amphoteric hydroxide easily.
- carbon dots,
- fluorescence,
- aluminum ions,
- zeta potential,
- dynamic light scattering
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