中文摘要：

利用溶剂热法,基于氢氧化钾的插层作用制备了荧光氮化碳量子点（g-C_3N_4QDs）.所获得的氮化碳量子点具有良好的水溶性和荧光稳定性.透射电子显微镜（TEM）照片显示,氮化碳量子点的粒径约为2.3 nm;X射线光电子能谱（XPS）和红外光谱（FTIR）结果表明,氮化碳量子点表面存在大量的亲水基团;荧光发射光谱（PL）结果表明,氮化碳量子点具有激发波长依赖性.基于三价铁离子（Fe~（3＋））对荧光氮化碳量子点荧光的猝灭现象,构建了一种用于检测Fe~（3＋）的荧光传感器,在Fe~（3＋）浓度为5~100μmol/L范围内,检测体系表现出良好的线性关系,检出限约为0.5μmol/L,实现了对Fe~（3＋）的高效、灵敏、选择性检测.

英文摘要：

As a new kind of two dimensional nanomaterials,graphitic carbon nitride（ g-C_3N_4） has extensively attracted interests due to the similar performance with grapheme. A solvothermal method of preparing fluorescent graphitic carbon nitride quantum dots（ g-C_3N_4QDs） in the presence of KOH intercalation was developed in this paper. The obtained g-C_3N_4 QDs exhibited excellent water dispersity and fluorescence stability. Transmission electron microscopy（ TEM） image showed the diameter of g-C_3N_4 QDs was about 2. 3 nm.There were large amounts of hydrophilic groups on the surface of g-C_3N_4 QDs exhibited by X-ray photoelectron spectroscopy（ XPS） and Fourier transform infrared（ FTIR） spectrum analysis. Excitation-dependent photoluminescence behavior was observed by photoluminescence（ PL） spectra. Owing to the phenomenon in which Fe~（3＋）ions has great influence on the fluorescence quenching of g-C_3N_4 QDs,we proposed one fluorescent sensor for the detection of Fe~（3＋）ions,and the detection system exhibited excellent liner relationship with the concentration of 5—100 μmol/L Fe~（3＋）ions,the detection limit for Fe~（3＋）ions was about 0. 5 μmol/L,making a highly efficient and sensitive selection for Fe~（3＋）ions.