Study On The Synthesis And Properties Of Fluorescence Carbon Dots

Because of the unique fluorescence properties and potential applications, Carbon Dotshave been concerned in many areas, which make it have a considerable applications inbiochemical analysis and cell imaging. Although there is a big progress on the preparation ofCarbon Dots, finding an economy and convenient way to synthesis the Carbon Dots still needfor more research. In this paper, we designed four kinds of Carbon Dots with high quantumyield, the main contents and the results of this paper are as follows:(1) The two kinds of blue fluorescent Carbon Dots have a relatively strong fluorescence.The quantum yield of citric acid Carbon Dots can reach32%, and the best ratio is0.5mLethidene diamine with1g citric acid, the partical size of it is3nm. The fluorescence of citricacid Carbon Dots increases with the increase of the solution pH, and the fluorescent intensitywill be affected with the presense of Cu2+, while the Carbon Dots can be easily uptaken bythe cells, exhibit a stable blue fluorescence, and it’s non-toxic to the cells. The quantum yieldof acrylic acid Carbon Dots can reach26%, and the best ratio is5mL ethidene diamine with5mL acrylic acid, the partical size of it is4nm. The fluorescence of acrylic acid Carbon Dotsremaine the same with the increase of the solution pH, while the Carbon Dots can be easilyuptaken by the cells, exhibit a stable blue fluorescence, and it’s non-toxic to the cells.(2) For the green fluorescent Carbon Dots, the Urea Carbon Dots(QY is0.49) have ahigher quantum yield than the1,6-hexanediol Carbon Dots(QY is0.09), and the best ratio is2g urea with1g citric acid. The two kinds of Carbon Dots have different fluorescenceproperties in different pH solutions, in which1,6-hexanediol Carbon Dots reach themaximum in solution near neutral pH, while Urea Carbon Dots reach the maximum when thepH value is small. Both of the Carbon Dots remaine the same fluorescence in different cationsolution, and the Carbon Dots can be easily uptaken by the cells, exhibit a stable bluefluorescence, and it’s non-toxic to the cells.