Preparation Of Micro/Nano Functional Materials By Template Method

Micro-nano functional materials have broad application prospects because of their special physical and chemical properties,but their properties are affected by their morphology and structure.Due to the advantages of clear mechanism and good repeatability,the template method can easily prepare micro/nano functional materials with special structure.In this paper,we used the common template materials?PS,SiO₂?and novel template materials?Wax/SiO₂-SO₃H colloidosomes?to prepare hollow Fe₃O₄@PPy-Ag microspheres,hollow PPy capsules using,Wax/SiO₂-SO₃H/PPy?Ag,Au?colloidosomes and other micro-nano functional materials.In addition,we also obtained the hollow PNCPy@?-FeOOH composite microspheres by one-step reaction from the self-template method.The research contents are as follows:?1?The sulfonated polystyrene?SPS?microspheres as template:because of electrostatic interaction of sulfonic acid groups with metal ions and pyrrole,they were absorbed to the surface of SPS microspheres.Then the Fe₃O₄ NPs and PPy-Ag nanocomposite shells were continuously coated on the SPS microspheres by coprecipitation and in situ polymerization.Finally,the hollow Fe₃O₄@PPy-Ag microspheres could be obtained via selective removal of SPS cores of the as obtained SPS@Fe₃O₄@PPy-Ag microspheres.The application of magnetic PPy-Ag microspheres in reduction of methylene blue?MB?dye was investigated.The results exhibited that the hollow Fe₃O₄@PPy-Ag microspheres had good catalytic activity and reusability.?2?The SiO₂-SH microspheres were gain by directly hydrolyzing 3-MPTMS,and the sulfonyl groups on the surface were oxidized to a sulfonic acid group by H₂O₂ to obtain SiO₂-SO₃H microspheres.The SiO₂-SO₃H microspheres were used as templates to polymerize pyrrole to obtain the core-shell SiO₂-SO₃H@PPy nanocomposite and hollow PPy capsule.Wax/SiO₂-SO₃H colloidosomes were gain by Pickering emulsion method and used as template to prepare Wax/SiO₂-SO₃H/PPy?Ag,Au?colloidosomes.Finally,the templates were removed to prepare SiO₂-SO₃H/PPy?Ag,Au?Janus particles and PPy?Ag?nano bowls.Among them,Wax/SiO₂-SO₃H/Ag colloidosomes exhibits excellent SERS enhancement and is an excellent 3D SERS substrate material.?3?Based on the emuliion droplet as self-template,hollow PNCPy@?-FeOOH microcomposite were obtained by one-step reaction.We systematically investigated the growth process,the influence of[Fe³⁺]/[NCPy]ratio on the structure and morphology of microcomposite and the mechanism of the reaction.