中文摘要：

制备了单分散性良好且尺寸可调的具有荧光性质的CuFeS2纳米晶，利用紫外-可见吸收光谱（ UV-Vis）、荧光光谱、透射电子显微镜（ TEM）、X射线粉末衍射（ XRD）、元素分析和光电流测试等技术对其组分和结构进行了表征，分析了CuFeS2纳米晶尺寸变化对吸收光谱和光电响应行为的影响规律。随着CuFeS2纳米晶尺寸增大，其吸收峰位表现出符合量子尺寸效应的相应红移；具有荧光性质的CuFeS2纳米晶可控制备预示其在生物医学成像和光电器件等领域具有应用前景。

英文摘要：

The mono-dispersed CuFeS2 nanocrystals（ NCs） with tunable sizes were synthesized and characte-rized by UV-Vis-NIR absorption spectroscopy, transmission electron microscopy（ TEM） , X-ray powder diffrac-tion（ XRD） and inductively coupled plasma（ ICP） . It is found that the as-prepared CuFeS2 NCs show photolu-minescence in visible region. The photo-responsive properties of CuFeS2 NCs further reveal their suitability as optically active components for optoelectronic devices and the growth in size due to the quantum size effect. All the experimental results indicate that as-prepared CuFeS2 NCs with characteristics of fluorescence has potential application in biomedical imaging and optoelectronic devices.