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Synthesis of monocarboxylic acid-modified CeO2 nanoparticles using supercritical water

机译：超临界水合成单羧酸改性的CeO2纳米粒子

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摘要

This study reports a simple, rapid synthesis technique for the preparation of monocarboxylic acid-modified CeO2 nanoparticles. The nanoparticle products were prepared under hydrothermal conditions using supercritical water and Ce(OH)(4) as a precursor in the presence of monocarboxylic acids with different alkyl chain lengths (C6-18) acting as surface modifiers. The precursor and surface modifiers were heat-treated in a batch-type reactor at 400 degrees C for 30 min. The carboxylic acids attached to the surface of the products by coordination bonds between the carboxylate (-COO-) and Ce ions. The amount of attached surface modifiers tended to increase with increasing alkyl chain length. The products exhibited a cubic morphology and particle sizes of approximately 10 nm, controlled by the surface modifiers. Surface modification also controlled the band gap of the products, suggesting the possibility of tuning their electronic and optical properties by using organic surface modifiers.
机译：这项研究报告了一种简单，快速的合成技术，用于制备单羧酸改性的CeO2纳米颗粒。纳米颗粒产品是在水热条件下使用超临界水和Ce（OH）（4）作为前体，在具有不同烷基链长（C6-18）的一元羧酸作为表面改性剂的情况下制备的。前体和表面改性剂在间歇式反应器中在400摄氏度下热处理30分钟。羧酸通过羧酸根（-COO-）和Ce离子之间的配位键连接到产品表面。附着的表面改性剂的量倾向于随着烷基链长度的增加而增加。该产品表现出立方晶形态，并且受表面改性剂控制的粒径约为10 nm。表面改性还控制了产品的禁带宽度，表明使用有机表面改性剂可以调节其电子和光学性能。

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