Preparation of nylon 66-based carbon dots by solvothermal method and its application in fingerprint recognition,fluorescence anti-counterfeiting and light blocking
Nylon 66(PA66)-based carbon dots(66CDs)were prepared by solvothermal method using PA66 and phytic acid(IP6)as precursors and acetic acid as solvent,and characterized by TEM,FTIR,XPS and fluorescence spectrum.The 66CDs obtained were then analyzed for their optical properties,ionic stability as well as time stability,followed by investigation on their applications in fingerprint recognition,fluorescence anti-counterfeiting and blue light protection.The results indicated that,under the conditions of 1.6 g PA66,1.1 g IP6,20 mL acetic acid,reaction temperature 260 ℃ and reaction time 36 h,the prepared 66CDs,which exhibited a spherical structure with an average particle size of 4.00 nm,and carboxyl,hydroxyl,amino as well as other functional groups on the surface,showed the maximum fluorescence intensity.The fluorescence of 66CDs was non excitation wavelength dependent,with the optimal excitation and emission wavelength of 360 and 490 nm,respectively.The fluorescence quantum yield of 66CDS could reach 11.69％,while the fluorescence intensity was not affected by common metal cations,and could maintain stable within 30 d.The fluorescent powder prepared by 66CDs and water-soluble starch could be used for fingerprint identification,and nevertheless,66CDs could be made into ink for fluorescence anti-counterfeiting,and anti-blue light film for blue light protection.
万方数据
维普
