Mof core shell structure nanoparticle
This study offers a new method to tailor the structure of MOF-based SERS substrates for on-site screening or point-of-care applications. The method is effective over a wide range of PAH concentrations (0.5 nM to 0.5 M), with detection limits as low as hundreds of pM. More importantly, the polyhedral composites provide high sensitivity for detection of polycyclic aromatic hydrocarbons (PAHs) while preserving the cyclability and selectivity required for reliable quantitative analysis. The optimized polyhedral structures exhibit high SERS activity for detecting 4-aminothiophenol at a concentration as low as 5 × 10 −10 M. The composites combine abundant SERS “hot spots” among the high-density Ag NPs and the excellent adsorption performance of the MOF, resulting in effective pre-concentration of analytes in close proximity to these “hot spots” and enhancement of SERS sensitivity. 1.3 General Approach to Synthesize MetalMOF Core-Shell Nanoparticles. The morphology and Ag coverage of core–shell structures can be easily controlled by electrodeposition potential and time without substrate motion. Metal Nanocrystal, Metal-Organic Frameworks, Core-Shell Structure, Catalysis.
Core–shell metal–organic framework (MOF nanoparticles (NPs) are prepared on a screen-printed carbon electrode (SPCE) via in situ electrodeposition. It is shown that the shell density profile can be described by a scaling model that takes into account the locally very high grafting density near the core. This paper reports the fabrication of a highly sensitive and reusable substrate for surface-enhanced Raman scattering (SERS) analysis. Here we use small-angle X-ray scattering (SAXS) to investigate iron oxide core-poly(ethylene glycol) brush shell nanoparticles with extremely high polymer grafting density.