Research On Optical And Electrical Properties Of PFR-based Nanomaterials And Bimetal Micro/Nano Materials

Due to the merits of unique microstructure,the excellent catalytic activity,large surface area,high surface energy,and excellent photonic electronic properties,nanomaterials are widely applied in optical detection and energy storage.Compared to traditional organic dyes and quantum dots,phenolic resins are very attractive because of their excellent biocompatibility,photobleaching resistance,fluorescence modulation,good monodispersity and low cytotoxicity.Metal nanoparticles have the advantages of controllable size,volume effect,quantum size effect,surface effect,and macro quantum tunnel effect,which makes them as ideal candidate in the fields of catalysis,energy storage,and imaging.This paper focuses on the preparation,characterization and application of multifunctional nanocomposites.The main research contents can be summarized as follows:(1)The up-conversion luminescent nanoparticles of NaYF₄:Yb,Tm(UC)were synthesized by high temperature oil phase method,and then modified with citric acid to synthesize hydrophilic cit-coated-UC.The core-shell UC@Phenol formaldehyde resin(PFR)nanoparticles were synthesized by hydrothermal reaction.Through the reducing of hydroxyl group in PFR shell,Ag/Au nanoparticles were loaded onto the surface of PFR shell in situ.The experimental results show that UC can cause the agglomeration of PFR nanoparticles and bring a significant fluorescence enhancement of PFR.Due to the fluorescence quenching of Au/Ag nanoparticles,two kinds of fluorescence resonance energy transfer(FRET)materials were constructed.The as-synthesized two kinds of FRET fluorescent probes were used to detect S^2-or Cu²⁺sensitively.Under the optimized experimental conditions,S^2-has a good linear relationship in the range of 2-100 nmol?L^-1with the detection of limit(LOD)0.67 nmol?L^-1,Cu²⁺has a good linear relationship in the range of 2-100 nmol?L^-1 with the LOD of 0.54 nmol?L^-1.(2)Through preheating of the mixture of AgNO₃,phenol and hexamethylenetetramine(HMT),the core-shell structure Ag@PFR were prepared by hydrotherm method.Thus,Ag nanoparticles were filled in PFR through heating and refluxing the mixture of Ag@PFR and AgNO₃.After etching Ag nanoparticles in PFR with HNO₃,a porous structure PFR nanosphere were obtained.The effect of the as-synthesized PFR nanosphere on drug deliver was studied.The experimental results show that the drug release rate of the PFR nanosphere is highly dependent on p H.It could be found that the cumulative release of DOX was very higher in the PBS buffer solutions of p H 5.0,and the release amount reached about 78%within 72 h.Therefore,the as-synthesized PFR with porous structure could be a promising antitumor drug carrier for tumor treatment.(3)A simple hydrothermal method was used to synthesize sheet-like FeCo(OH)_x on Ni foam and a facile phosphating reaction was performed to obtain the sheet-like FeCoP composites.After a series of electrochemical test,the specific capacitance of the corresponding sheet-like FeCoP composites was 4.57 F·cm^-2 under the current densities of 4 m A·cm^-2 with the specific capacitance retention rate of 89%after 5000 charge and discharge cycles.In water decomposition,the hydrogen evolution reaction(HER)overpotential reach 75 m V at the current density of 10 m A?cm^-2,the oxygen evolution reaction(OER)overpotential and achieve 259 m V at the current density of 50 m A?cm^-2,which indicates that the as-synthesized sheet-like FeCoP composites has good application in water decomposition.