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以蔗糖为碳源制备了碳点,用透射电子显微镜、红外光谱、紫外光谱和荧光光谱进行了表征,该碳点呈准球形,粒径在2nm左右,并且表面带有羟基、羧基等水溶性基团。碳点溶液的最大吸收波长为286nm,最大荧光发射波长为526nm。溶液酸度对荧光强度和发射峰的位置有一定影响。将制备的碳点沉积于ITO电极表面后,进行光电流、光电压测试,与空白ITO电极相比,修饰后的电极光电流增大3.3倍,光电压增大5.3倍。
The carbon dots were prepared by using sucrose as carbon source. The carbon dots were characterized by transmission electron microscopy, infrared spectroscopy, ultraviolet spectroscopy and fluorescence spectroscopy. The carbon dots were of quasi-spherical shape and the particle size was about 2 nm. Group. The maximum absorption wavelength of the carbon spot solution is 286 nm, and the maximum fluorescence emission wavelength is 526 nm. Solution acidity has some influence on the fluorescence intensity and the location of the emission peak. After the prepared carbon dots were deposited on the surface of ITO electrode, photocurrent and photovoltage test were carried out. Compared with the blank ITO electrode, the photocurrent of the modified electrode increased 3.3 times and the photovoltage increased 5.3 times.