Mesoporous silicon fluorescent material and preparation method
A fluorescent material and mesoporous silicon technology, which is applied in the fields of chemistry and material science, can solve the problems of small Stokes shift, and achieve the effects of wide excitation spectrum, wide source and convenient operation.
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Embodiment 1
[0037] Disperse 0.3 g of ordered mesoporous silica (SBA-15) into 30 mL of toluene, add 1.2 mL of aminopropyltriethoxysilane (APES), stir for 24 hours at 60°C under nitrogen protection, and wash with toluene and ethanol Then, it was dried under vacuum at 60℃ to obtain modified mesoporous silica (SBA-15-APES); 0.2g of SBA-15-APES and 0.3g of citric acid were added to 15mL of water, stirred at room temperature for 2.5h, and then transferred to the reactor, 180 After reacting at ℃ for 4 hours, washing with water and ethanol, drying to obtain the mesoporous silicon fluorescent material, the fluorescence spectrum of the mesoporous silicon fluorescent material is as follows figure 1 As shown, the half-width of the fluorescence emission peak is narrow, and the fluorescence emission peak changes with the wavelength of the excitation light, and has a large Stokes shift.
Embodiment 2
[0039] Disperse 0.3 g of ordered mesoporous silica (SBA-15) into 30 mL of toluene, add 1.2 mL of N-aminoethyl-γ-aminopropyltrimethoxysilane (DAPS), and stir at 60°C under nitrogen protection After 24h, washed with toluene and ethanol and dried under vacuum at 60℃ to obtain modified mesoporous silica (SBA-15-DAPS); add 0.2g of SBA-15-DAPS and 0.3g of citric acid to 15mL of water and stir at room temperature for 2.5h Transfer to the reactor, react at 180℃ for 4 hours, wash with water and ethanol, and dry to obtain the mesoporous silicon fluorescent material. The fluorescence spectrum of the mesoporous silicon fluorescent material is as follows figure 2 As shown, the half-width of the fluorescence emission peak is narrow and has a large Stokes shift.
Embodiment 3
[0041] Disperse 0.3 g of ordered mesoporous silica (SBA-15) into 30 mL of toluene, add 1.2 mL of N-aminoethyl-γ-aminopropyltrimethoxysilane (DAPS), and stir at 60°C under nitrogen protection After 24h, washed with toluene and ethanol and dried under vacuum at 60℃ to obtain modified mesoporous silica (SBA-15-DAPS); add 0.2g SBA-15-DAPS, 0.3g citric acid and 0.3mL diethylene into 15mL water Triamine (DETA) was stirred at room temperature for 2.5 hours and then transferred to the reactor, reacted at 180°C for 4 hours, washed with water and ethanol, and dried to obtain the mesoporous silicon fluorescent material. The fluorescence spectrum of the mesoporous silicon fluorescent material is as follows image 3 As shown, after the surface modification of the carbon dots, the half-width of the fluorescence emission peak of the mesoporous silicon fluorescent material is narrowed, and the fluorescence intensity is significantly enhanced.
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