大尺寸石墨烯量子点组装体的制备及电化学发光性能

Fabrication of a Dispersible Large-sized Graphene Quantum Dot Assemblies from Graphene Oxide and Its Electrogenerated Chemiluminescence Behaviors

对氧化石墨烯纳米材料进行HNO_(3)氧化处理,制备了水溶性好且具有强电化学发光(ECL)活性的大尺寸石墨烯量子点组装体(Large-sized graphene quantum dot assemblies,LSGQD-NAs).利用透射电子显微镜(TEM)、原子力显微镜(AFM)、傅里叶变换红外光谱(FTIR)和拉曼光谱(Raman)等方法对其进行了表征,结果表明,石墨烯量子点组装体的平均高度为20 nm,且富含大量的羟基和羧基.电化学测试结果显示,在共反应物K_(2)S_(2)O_(8)存在下,LSGQD-NAs在阴极产生很强的ECL(峰值约在685 nm);并推测了其ECL反应机理,发现LSGQD-NAs容易通过中心未氧化的石墨烯π-π作用于GC电极表面进行组装修饰.本研究为基于石墨烯量子点ECL传感器的研究提供了新方法.

A dispersible large-sized graphene quantum dots assemblies(LSGQD-NAs)in aqueous solution with strong electrochemiluminescence activity was fabricated from graphene oxide by nitric acid etching.LSGQD-NAs were characterized by transmission electron microscopy(TEM),atomic force microscopy(AFM),Fourier transform infrared spectroscopy(FTIR)and Raman spectroscopy(Raman),etc.The results demonstrated that the large-sized graphene quantum dots had an average height of 20 nm and contained abundant carboxyl and hydroxyl groups.Strong ECL was studied in detail with the coreaction of K_(2)S_(2)O_(8) and the maximum emission wavelength at 685 nm.It is found that LSGQD-NAs can be easily assembled and modified on the surface of GC electrode through theπ⁃πbond action of unoxidized graphene.This study provides a new method for the research of ECL sensor based on graphene quantum dots.