研究了铝离子(Al3+)与表面带有大量羟基的荧光碳点之间的相互作用.当Al3+的浓度在0.2～8 μmol/L时,碳点的荧光随其浓度的增大而逐渐被猝灭；继续增大Al3+的浓度,碳点的荧光逐渐恢复.借助Zeta电位与动态光散射(DLS),初步探讨了二者的作用机理.Al3+极易结合碳点表面的羟基,拉近碳点之间的距离引起碳点聚集,从而导致荧光猝灭；当碳点表面的羟基与Al3+完全配位后,碳点表面的负电荷转变为正电荷,由于静电排斥作用和空间效应,聚集的碳点重新分散,致使荧光恢复.对比Cr3+和Fe3+与荧光碳点的作用,发现它们对荧光碳点只有较强的猝灭作用,在高浓度时却未出现碳点荧光恢复的现象,这归因于Al3+易形成两性氢氧化物.
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