水热法合成双发射碳点的研究

制备了一种新型的具有双发射波长的荧光碳点(CDs)。以柠檬酸和苯并咪唑为原料,以甲酰胺为溶剂,采用一锅煮水热法合成。通过紫外-可见吸收光谱和荧光光谱对其光学性能进行研究,透射电子显微镜、X-射线衍射、拉曼光谱和傅里叶变换红外光谱等方法对碳量子点组成和形貌进行表征。结果表明,制备的CDs呈现蓝色荧光和红色荧光,在水溶液中有良好的分散性和光稳定性。合成的CDs发射的红光比蓝光对酸碱有着更高的灵敏性。红光发射在碱性中荧光较强,在酸性介质中荧光减弱,展现了潜在的pH传感性能。合成方法简单,对实现大批量合成双发射碳点提供一种新的思路。

Hydrothermal Synthesis of Dual Emission Carbon Dots

As a new type of zero-dimensional carbon based nanomaterials,fluorescent carbon dots(CDs) has attracted extensive attention from the scientific community in recent years.The purpose of this article is for the preparation of CDs with dual emission wavelength,the one-pot hydrothermal method is adopted,with citric acid (CA) and benzene and imidazole as raw material,with formamide as solvent,using by ultraviolet-visible absorption spectra (UV-vis) and fluorescence spectroscopy (PL) to study its optical performance,by transmission electron microscope (TEM),X-ray diffraction (XRD),Raman spectroscopy (Raman) and Fourier transform infrared spectroscopy (FTIR),the composition and morphology of carbon quantum dots were characterized.The results showed that the prepared CDs showed blue fluorescence and red fluorescence,and had good dispersion and light stability in aqueous solution.Synthetic CDs emit red light that is more sensitive to acids and bases than blue light.The fluorescence of red light is stronger in alkaline medium than in acidic medium,showing potential pH sensing performance.This method is simple and provides a new way to realize mass synthesis of dual emission carbon dots.