Construction And Performance Of Multifunctional Nanocomposites Based On Luminescent Materials

Multifunctional nanocomposites based on luminescent materials are fabricated by attaching other functional materials on the optical materials,which have important research significance in the fields of chemistry,biology,environment,catalysis and others.Rare-earth luminescent materials have received extensive attention due to their unique luminescent characteristics,good physical and chemical property.Different hosts and doping ions can enhance the luminescence intensity and improve the properties.Noble metal materials can effectively transfer light energy to heat energy due to their intrinsic surface plasmon resonance and energy resonance transfer effects.In this dissertation,rare-earth luminescent materials and noble metal materials are combined to construct nanocomposites with optimized magnetic-optical-thermal versatility by simple and efficient methods,the main research work has been carried out on the selection,design,construction and multifunctional application of the multifunctional nanocomposites.The details are as follows:?1?Ag nanospheres with homogeneous dispersion were prepared by solvothermal method and coated with PVP.Rare-earth luminescent materials Ba₂GdF₇:Yb³⁺,Ho³⁺were further synthesized on the Ag@PVP to construct Ag@PVP-Ba₂GdF₇:Yb³⁺,Ho³⁺nanocomposites with novel morphology and multifunctionality.Under the near-infrared laser irradiation,the nanocomposites exhibit good upconversion luminescence performance and CT imaging capability,and they also show effective thermal killing ability in the photothermal therapy of tumor cells in vitro.The nanocomposites will have a good application prospect in the collaboration of multimodal imaging detection of tumors and high-efficiency photothermal therapy.?2?Well-dispersed Ag nanowires and PVP-modified BaGdF₅:Yb³⁺,Er³⁺spherical nanoparticles were prepared by solvothermal and hydrothermal method,respectively.Meanwhile,Ag nanowires and BaGdF₅:Yb³⁺,Er³⁺rare-earth luminescent material were compounded to construct Ag nanowires@BaGdF₅:Yb³⁺,Er³⁺nanocomposites.The nanocomposites possess luminous,thermal,and magnetic versatility,which can achieve upconversion fluorescence,CT,MR multimodal imaging,and exhibit high efficiency in the photothermal therapy of cancer cells.The multifunctional nanocomposites can effectively combine multimodal imaging with photothermal therapy,which not only provide a new strategy for preparing nanocomposites with multifunctional properties,but also possess potential application in the field of cancer therapy and detection.?3?Ag nanocubes were prepared by solvothermal method.Then,NaYF₄:Yb³⁺,Tm³⁺were synthesized directly on the surface of Ag nanocubes,and multifunctional Ag nanocubes@NaYF₄:Yb³⁺,Tm³⁺nanocomposites were constructed by the simple method.Under the near-infrared laser irradiation,the nanocomposites exhibit good upconversion fluorescence and photothermal conversion.At the same time,the nanocomposites also exhibit good photothermal therapy efficiency,suggesting that the nanocomposites will have a good application prospect in fluorescence imaging and cancer therapy.