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• W4282974745 endingPage "9505" @default.
• W4282974745 startingPage "9492" @default.
• W4282974745 abstract "Porous, defective, gray cerium oxide (g-CeO2–x) microspheres 4.8 μm in size were synthesized as a multifunctional nanozyme with catalase-, peroxidase-, and oxidase-like activities by the reduction of monodisperse-porous cerium oxide (CeO2) microspheres. Higher Ce(III) atomic fraction, more oxygen vacancy, and lower oxygen content on the surface of g-CeO2–x microspheres were shown by Raman and X-ray photoelectron spectroscopy. Band gap energies of plain CeO2 and g-CeO2–x microspheres were determined as 3.0 and 2.4 eV, respectively. Reactive oxygen species (ROS) related to the enzyme-mimetic activity of g-CeO2–x microspheres were determined as singlet oxygen (1O2•) and superoxide anion (•O2–) by ESR spectroscopy. Michaelis–Menten plots sketched for catalase-, peroxidase-, and oxidase-like activities provided superior maximum substrate consumption rates for g-CeO2–x microspheres. Oxidase- and peroxidase-like activities were used for developing colorimetric and fluorometric protocols for the detection of nitrite as a common pollutant, respectively. g-CeO2–x microspheres also exhibited a photothermal response explained by enhanced light adsorption originated from more oxygen vacancies. A temperature elevation up to 19 °C was obtained under near infrared laser irradiation at 808 nm. Photothermal response accompanying with multifunctional enzyme-mimetic activities makes the porous nanozyme a promising synergistic therapy agent capable of overcoming hypoxia and generating additional ROS in a tumor microenvironment." @default.
• W4282974745 created "2022-06-17" @default.
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• W4282974745 date "2022-06-15" @default.
• W4282974745 modified "2023-10-16" @default.
• W4282974745 title "Porous, Oxygen Vacancy Enhanced CeO_2–<i>x</i> Microspheres with Efficient Enzyme-Mimetic and Photothermal Properties" @default.
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• W4282974745 doi "https://doi.org/10.1021/acssuschemeng.2c01981" @default.
• W4282974745 hasPublicationYear "2022" @default.
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