CAJ | 학술논문

以不同的氯代烃和胺类为反应原料，在相同反应条件下制备了2类荧光发射波长随激发波长变化而变化的碳点。其中一类碳点的荧光强度随着激发波长的红移呈现类似于高斯曲线的变化趋势(类型I)，另一类碳点的荧光强度随激发波长变化不规律(类型Ⅱ)。通过荧光光谱、透射电子显微镜、X射线光电子能谱和红外光谱对2类碳点的结构和性质进行了表征和比较。考察了类型Ⅱ碳点作为一种新型的荧光油墨在多重防伪领Ⅱ的应用性能。
이불동적록대경화알류위반응원료，재상동반응조건하제비료2류형광발사파장수격발파장변화이변화적탄점。기중일류탄점적형광강도수착격발파장적홍이정현유사우고사곡선적변화추세(류형I)，령일류탄점적형광강도수격발파장변화불규률(류형Ⅱ)。통과형광광보、투사전자현미경、X사선광전자능보화홍외광보대2류탄점적결구화성질진행료표정화비교。고찰료류형Ⅱ탄점작위일충신형적형광유묵재다중방위령Ⅱ적응용성능。
Carbon dots with excitation-dependent emission were prepared using different chlorohydrocarbon and amine as reactants under the same reaction condition. The carbon dots 1 and carbon dots 2 had selective emissions in a range of 423—556 nm and 460—555 nm, respectively, in addition, their fluorescence intensity changes could be modeled by a Gaussian-like curve with the red shift of excitation wavelengths ( denoted as type Ⅰ carbon dots). The carbon dots 3 had emissions in a broad color range over the entire visible region (407—670 nm), moreover, their fluorescence intensities had irregular change with the excitation wavelengths ( denoted as typeIIcarbon dots). Then, fluorescence spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and infrared spectroscopy were explored to analyze their structural and spectral characteristics in detail. For the typeIIcarbon dots, except for the size effect, the surface functional groups, such as CO and CN, could efficiently introduce new energy levels for electron transitions and result in the continuously adjustable full color emissions. Further, the type II carbon dots were demonstrated as ideal candidates for high security anti-counterfeit purpose.