CeO2

Materials

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548CeO27.80.2nmTEM
593CeO2TEMThe resulting CeO2 nanozymes obtained by a simple solvothermal protocol are in highly morphological uniformity and dispersity (Fig. 1a and S1a) with an average size of 31.1 ±3.9 nm (Fig. 1c). The STEM image (Fig. 1b) shows a flower-like morphology assembled by tiny nanoparticles with an average size of 6.1 ± 1.6 nm.
656CeO23~4nmXRDThe synthesized CeO2 were uniform in size and the estimated average diameter was between 3 and 4 nm.The small and uniform particle size provides a larger specific surface area and more active sites, leading to superior enhanced performance in electrochemical detection.
777CeO2SEMHollow CeO2 microspheres were shown to range in size from 1 to 3 µm, with the outer shell composed of smaller CeO2 particles of 20 nm average size (Figure 1).28.0
778CeO292.04nmDLSThe Fig. 2I showed that the average size of CeO2, CeO2@APTES and CeO2@Ce6 was respectively 92.04 nm, 100.37 nm and 124.48 nm.
1090CeO22、10nmTEMTEM images (Figure S1) reveal the presence of well-defined nearly monodisperse nanoparticles with average sizes of 2 and 10 nm, respectively.
1108CeO25nmTEMAll around 5 nm as determined from high-resolution transmission electron microscopy (HRTEM) and dynamic light scattering (DLS) (Figure 1a–e).
1112CeO2SEMAs presented in Fig. 1a, the as-prepared CeO2 shows rod-like and porous characteristics with a diameter of ~7 nm and a length of 40~70 nm.82.5
1227CeO25nmTEMCeO2 nanoparticles were around 5 nm in size
1245CeO280-200nmTEMThe particle size distributions and potentials of the nanovesicles are presented in Figure 2I,J, respectively. The DLS analysis indicated that the nanovesicles ranged between 80 and 200 nm in size
1370CeO23-5nmTEM73.9
1409CeO244625nmTEMAverage size

Kinetics

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196CeO2OXD3,5-DTBC8.01262μM0.182μM/s6.28-41/s196M-1 s-1196
203CeO2PODH2O220.13mM203As shown in Figure 4A–C, when H2O2 was used as the substrate, the Km value of Au@CD, CeO2, and the mixture of Au@CD and CeO2 were 100.01, 20.13, and 800.34 mM, respectively.
593CeO2PODTMB0.07mM0.10-6M/s593593
656CeO2hydrolase656
993CeO2PODH2O2414.9mM74.4-8M/s993
993CeO2POD993
1115CeO2PODH2O24.5RT2.5mM4.56-8M/s11151115
1115CeO2PODH2O27.4RT0.5mM2.9-8M/s11151115
1227CeO2OXDTMB1227
1245CeO2CATH2O21245

Applications

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656CeO2pesticide detection.Methyl-paraoxonE-chem0.1-100 and 0.1-10μM/L0.06μM/LWhat's more, the oxidation peak current increased linearly with MP concentration in the ranges of 0.1–10 μmol/L and 10–100 μmol/L, with correlation coefficients (R2) higher than 0.99 for both two analytical curves (n=3, Fig. 6B).
777CeO2catalytic degradation of p-nitrophenolp-nitrophenolColorHMS showed a maximum p-NP degradation rate of 76.5% at a CeO2 dosage of 40 mg, 2 h reactive time, at 30°C and pH of 4.8 when the concentration of p-NP was 20 mg L−1.
993CeO2Measurement of HXHXColor50-800μM15μM
1108CeO2Boosted Oxidative Catalytic Activity
1115CeO2Melamine DetectionMelamineColor0.004-1.56nM4pM
1227CeO2Immunoassay for fenitrothionFenitrothionColor7.1-177.4ng/mL2.1ng/mL
1245CeO2Antitumor
1370CeO2protein carriers
1409CeO2Anticancer therapy

References

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title
DOI
material type
comment
548Polymer-Coated Cerium Oxide Nanoparticles as Oxidoreductase-like Catalystshttps://doi.org/10.1021/acsami.0c08778Metal oxideCeO2
1108CeO2 Nanoparticle Transformation to Nanorods and Nanoflowers in Acids with Boosted Oxidative Catalytic Activityhttps://doi.org/10.1021/acsanm.0c03387Metal oxideCeO2 Nanoparticle
1409Dual-path modulation of hydrogen peroxide to ameliorate hypoxia for enhancing photodynamic/starvation synergistic therapyhttps://doi.org/10.1039/d0tb01556cMetal oxideCerium oxide nanoparticles
1227Effect of proteins on the oxidase-like activity of CeO2 nanozymes for immunoassayshttps://doi.org/10.1039/d0an01755hMetal oxideCeO2
1245In Vivo Regenerable Cerium Oxide Nanozyme-Loaded pH/H2O2-Responsive Nanovesicle for Tumor-Targeted Photothermal and Photodynamic Therapieshttps://doi.org/10.1021/acsami.0c19074Metal oxideCeO2
1112Porous CeO2 nanorods loaded with indocyanine green for enhanced tumor-specific therapyhttps://doi.org/10.1016/j.micromeso.2021.110905Metal oxideporous CeO2 nanorods loaded with indocyanine green (ICG)
1090Mechanism and Dynamics of Fast Redox Cycling in Cerium Oxide Nanoparticles at High Oxidant Concentrationhttps://doi.org/10.1021/acs.jpcc.1c00382Metal oxideCeria nanocrystals (nanoceria)
656Electrochemical detection of methyl-paraoxon based on bifunctional nanozyme with catalytic activity and signal amplification effecthttps://doi.org/10.1016/j.jpha.2020.09.002Metal oxideA new electrochemical sensor for organophosphate pesticide (methyl-paraoxon) detection based on bifunctional cerium oxide (CeO2) nanozyme is here reported for the first time. Methyl-paraoxon was degraded into p-nitrophenol by using CeO2 with phosphatase mimicking activity.
593Synergistic effects between polyvinylpyrrolidone and oxygen vacancies on improving the oxidase-mimetic activity of flower-like CeO 2 nanozymeshttps://doi.org/10.1039/d0nr04177gMetal oxidepolyvinylpyrrolidone (PVP)-capped CeO2 nanoflowers
777Synthesis of CeO2 hollow microspheres with oxidase-like activity and their application in the catalytic degradation of p-nitrophenolhttps://doi.org/10.1080/09593330.2019.1624835Metal oxideCeO2
1370Catalytic performance of ceria fibers with phosphatase-like activity and their application as protein carriershttps://doi.org/10.1016/j.apt.2020.05.016Metal oxideceria fibers
778A versatile nanocomposite based on nanoceria for antibacterial enhancement and protection from aPDT-aggravated inflammation via modulation of macrophage polarizationhttps://doi.org/10.1016/j.biomaterials.2020.120614Metal oxidecoating red light-excited photosensitizer chlorin e6 (Ce6) onto nanoceria