Properties of ceria nanoparticles with surface modified by acidic groups
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RESEARCH PAPER
Properties of ceria nanoparticles with surface modified by acidic groups Polina A. Yurova & Natalia Yu. Tabachkova & Irina A. Stenina & Andrey B. Yaroslavtsev
Received: 29 June 2020 / Accepted: 12 October 2020 # Springer Nature B.V. 2020
Abstract The effect of the precursor and surface modification by sulfate and phosphate groups on the properties of cerium oxide was studied. The obtained materials were characterized by infrared (IR) and Raman spectroscopy, X-ray powder diffraction, scanning electron microscopy (SEM), high resolution transmission electron microscopy (TEM), thermogravimetric analysis (TGA) with the gas phase composition analysis, Brunauer–Emmett–Teller (BET) method, and impedance spectroscopy. The significant fraction of Се3+ ions at the surface of cerium oxide particles obtained from Ce(NO3)3 promotes the formation of double sodium cerium sulfate and cerium phosphate upon treatment with solutions of sodium hydrogen sulfate and sodium dihydrogen phosphate, respectively. The modification of ceria surface by sulfate groups leads to a decrease in specific surface area and water content of the obtained materials, as well as to a significant decrease in their P. A. Yurova : I. A. Stenina (*) : A. B. Yaroslavtsev Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky pr. 31, Moscow, Russia 119991 e-mail: [email protected] P. A. Yurova : A. B. Yaroslavtsev (*) Basic Department of Inorganic Chemistry and Materials Science, National Research University Higher School of Economics, Myasnitskaya Str. 20, Moscow, Russia 101000 e-mail: [email protected] N. Y. Tabachkova Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilov Str. 38, Moscow, Russia 119991
proton conductivity. CeO2 samples prepared from cerium ammonium nitrate have a significantly smaller particle size and higher conductivity. Its value for cerium oxide modified with phosphate groups increases up to 3.5 × 10−4 S/cm at 65 °C. The effect of hydration degree as well as Ce3+ content on the cerium oxides properties is discussed. Keywords Ceria . Surface modification . Surface acidity . Precursor valency . Conductivity . Nanostructures
Introduction Metal oxide nanomaterials have attracted the attention of many researchers due to their extraordinary properties (Thomas et al. 2020; Montini et al. 2016; Krindges et al. 2008). Cerium oxide has a special place among them. Among its possible applications, cosmetology and medicine can be mentioned, which are primarily associated with the ability of ceria to interact with reactive oxygen species (Walkey et al. 2015; Pezzini et al. 2017; Ge et al. 2015). Moreover, ceria properties (electrochemical, biological activity, etc.) and even its composition are determined by the particle size (Ivanov and Polezhaeva 2009). Ceria nanoparticles are inorganic antioxidants that can protect human skin from UV radiation (Caputo et al. 2015). They also protect cells by reducing oxidative stress due to their redox activity and help cor
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