氮、硫掺杂石墨烯量子点的调控制备与Fe^(3+)传感分析

The Tunable Preparation of N,S-Doping Graphene Quantum Dots and Its Application in Fe^(3+) Detection

采用一步固相合成方法制备了荧光量子产率高达82%的N,S-GQDs。并通过对制备时间的调控,得到尺寸更大的氧化石墨烯纳米片。与未掺杂GQDs相比,N,S-GQDs表面电子特性及表面化学活性明显改变。所得到的N,S-GQDs可与Fe3+的特异性结合引起电子转移,导致N,S-GQDs的荧光猝灭。据此建立了高灵敏、高选择性传感Fe3+的定量分析方法,检出限为3.3nmol·L-1,线性范围0.01~3μmol·L-1。

N,S doped-GQDs with good fluorescent properties and high QY of 82% were prepared via a one-pot solid phase synthesis approach.Larger graphene oxide nanosheets could also be obtained by regulating the reaction duration.Compared with undoped GQDs,the N,S-GQDs are merited with improved electronic properties and surface chemical reactivity.The specific coordinating interaction between Fe3+and N,S-GQDs leads to the electron transfer,which eventually results in the quench of the fluorescence of N,S-GQDs.A sensitive and selective method for Fe3+detection is thus developed,and Fe3+in the concentration range of 0.01~3μmol·L-1 could be accurately detected.The limit of detection is deduced to be 3.3nmol·L-1.