Size Effect in Pd− Ir Core‐Shell Nanoparticles as Nanozymes

References

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DOI
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366Size Effect in Pd− Ir Core‐Shell Nanoparticles as Nanozymeshttps://doi.org/10.1002/cbic.202000147MetalPd−Ir core-shell nanoparticles

Materials

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size
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BET
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366Pd−Ir core-shell nanoparticles3.3–13.0nmTEMPd−Ir nanoparticles with four different sizes (3.3, 5.9, 9.8 and 13.0 nm), but identical shapes and surface structures, were designed and synthesized.atalytic activity of individual Pd−Ir NPs increases as particle size increases. Area-specific catalytic activity is similar for Pd−Ir NPs of 3.3–9.8 nm, but is slightly decreased when particle size reached to 13.0 nm.

Kinetics

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366Pd−Ir core-shell nanoparticles(3.3 nm)PODTMB2.7-4M6.3-7M/s9.441/s366
366Pd−Ir core-shell nanoparticles(9.8 nm)PODTMB4-4M8.9-6M/s9.651/s366
366Pd−Ir core-shell nanoparticles(13.0 nm)PODTMB3.4-4M7.2-7M/s1.261/s366
366Pd−Ir core-shell nanoparticles(5.9 nm)PODTMB6.4-4M1.3-7M/s3.451/s366

Applications

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linear range
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366Pd−Ir core-shell nanoparticlesThis work not only demonstrates the size effect, but also provides an effective strategy to enhance the performance of nanozymes in certain applications.10- 2000pg/mL8.2, 4.6, and 3.7pg/mLthe limit of detection (LOD, which was defined by the 3SD method33) for the ELISAs were lowered from 9.3, to 8.2, 4.6, and 3.7 pg/mL when the size of Pd−Ir NPs was reduced from 13.0 to 9.8, 5.9, and 3.3 nm, respectively.
366Pd−Ir core-shell nanoparticlesThis work not only demonstrates the size effect, but also provides an effective strategy to enhance the performance of nanozymes in certain applications.10- 2000pg/mL8.2, 4.6, and 3.7pg/mL