![]() ![]() The microspheres are robust and the high density of the SERS active Ag nanoparticles on the microspheres provided unique signal averaging for the method to be potentially quantitative which is an urgent goal for SERS substrate design and SERS analysis. Using vinyltriethoxysilane (VTEOS) as silane agent, functional silica particles structured vinyl groups on surfaces were prepared by hydrolysis. SERS experiments with 4-aminobenzenethiol (4-ABT) as the indicator showed that the resulting multifunctional microspheres allowed the production of highly consistent enhancement of the Raman signals down to nM concentrations of 4-ABT, making them highly desirable candidates as the enhancers for high performance SERS analysis and as SERS optical labels in biomedical imaging. Coreshell poly (acrylic acid)/polystyrene/SiO 2 (PAA/PS/SiO 2) hybrid microspheres were prepared by dispersion polymerization with three stages in ethanol and ethyl acetate mixture medium. Preliminary results indicated that the microspheres are easily prepared with exceptional chemical and physical uniformity. The Ag nanoparticle shell is stabilized with a silica layer using a sol–gel process, which is also functionalizable with reactive epoxides for further bio-conjugation using epoxy ring-opening methods. The shell of silver nanoparticles, formed in situ by controlled interfacial reduction of AgNO 3 with polyvinylpyrrolidone (PVP), serves as the optimal metal enhancer for surface enhanced Raman spectroscopy ( SERS). Polyacrylic acid-grafted graphene oxide (GO-g-PAA) was used as a surface ligand during the synthesis of the CsPbX3perovskite nanocrystals (NCs), yielding particles (512 nm) with tunable halide compositions that were homogeneously embedded in the GO-g-PAA matrix. The monodisperse polymer core of poly(styrene- co-acrylic acid), prepared by surfactant-free emulsion polymerization, serves as the supporting template to facilitate the synthesis and handling of the highly functionalized substrates to achieve consistent mechanical and surface chemical properties. created various core-shell NPs with AuNPs as the core and stimuli-sensitive polymers such as PAA, poly(N,N methylene bis(acrylamide))(. The authors demonstrated the core-shell morphology with polystyrene in the core and elastomeric poly(methyl methacrylate-b-acrylic acid) shell using X-ray. A new type of polymer core and silver nanoparticle/ silica shell multifunctional composite microsphere is reported. ![]()
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