Preparations And Properties Of Micro/Nano Composites Based On Templated Method

The templated method is a general method for preparation of micro/nano-materials with unique structure,morphology and properties,and such materials have been widely used in catalysis,sensing,nano-biotechnology,surface enhanced Raman scattering(SERS)and so on.However,at present,there are some shortcomings in the templated method,such as complex processes,expensive equipment and low utilization of templates,and the structure of the materials is always simplex,which has limited its applications.In this paper,by using colloidal crystals and colloidal spheres as templates,the multifarious micro/nano composites are synthesized through simple physical and chemical methods,and their performances were investigated.Moreover,this paper aims to solve the common problems in the current template method and develop a simple and effective method for constructing micro/nano composites based on colloidal template.(1)The ordered Cu nanoparticle arrays with scale of square centimeter were prepared based on monolayer polystyrene(PS)microspheres.The array was an inexpensive SERS substrate with a simple preparation process and highly adjustable structural parameters of array.4-mercapto-thiophenol(4-ATP)as the target molecule,the SERS performance of the ordered Cu nanoparticles array was studied systematically.The results showed that the SERS performance of the array gradually decreased,with the periodicity increasing,and the detection of 4-ATP solution concentration can be as low as 10-7M.(2)Based on the ordered Cu nanoparticle array,the Cu@reduction graphene(rGO)composite nanoparticle array with excellent catalytic activity for 4-nitrophenol(4-NP)and methylene blue(MB)was successfully constructed.The catalytic activity of Cu@rGO composite nanoparticle array were systematically studied with the array parameters such as periodicity and particle size.The results show that the catalytic activity of the array is 14 times higher than that of gold(Au)nanoparticles,and it has the advantages of easy recovery and high cycle stability.(3)Au nanosphere array were prepared by using monolayer colloidal crystal template,and PBA modified Au@metal-organic framework(MOFs)composite nanoparticle array was successfully constructed.The optical response of surface plasmon resonance(SPR)peak and the diffraction peak from array to the concentration of glucose solution was systematically studied.The results show that the SPR peak and the diffraction peak have good complementary effects in different concentration ranges,thus the functionalized array can be used as a dual-channel biosensor to detect specific biomolecules.(4)Hierarchical micro/nanostructured C doped Co/Co3O4 hollow spheres oxygen evolution(OER)catalyst was successfully synthesized by using PS microspheres as template.The hollow spheres as a low-cost OER catalyst had advantages of large surface area and high conductivity.The catalytic activity of hollow spheres was systematically studied with the parameters of catalyst,such as morphology and conductivity.The results show that the excellent OER catalytic activity is attributed to a large amount of active sites and good conductivity.(5)We developed a common method for the preparation of precious metal nanoparticles@ZIF-67 with polystyrene sulfonate(PSS)as a modifier.Based on this method,an ordered Au@ZIF-67 composite nanoparticle array was successfully constructed.Studies have shown that the array can be used as a SERS substrate for the detection of volatile organic solvent molecules such as n-butanol and toluene.