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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >Localization of conduction electrons in hydrothermally reduced graphene oxide: electron paramagnetic resonance studies
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Localization of conduction electrons in hydrothermally reduced graphene oxide: electron paramagnetic resonance studies

机译：水热还原石墨烯氧化物中的传导电子定位：电子顺磁共振研究

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摘要

Partially reduced graphene oxide (prGO) obtained by hydrothermal reduction was studied by electron paramagnetic resonance (EPR) spectroscopy in the temperature range 4.2-300 K. The EPR absorption is accompanied by nonresonant microwave absorption due to dielectric and conduction losses in prGO. This additional absorption is taken into account to determine correctly intensities of EPR spectra. The EPR spectra of prGO consist of the broad and narrow components. Above 100 K, the intensity of the broad component exhibits the Curie-Weiss behavior, but below 100 K it follows the Curie law revealing the disappearance of antiferromagnetic correlations. For the first time, the unusually strong increase of the narrow EPR signal intensity with lowering temperature is observed. This effect is explained by the Anderson localization of conduction electrons in the defected crystalline structure of prGO. Due to low spin density, the localized electrons become isolated and their magnetic susceptibility follows the Curie law with the temperature-dependent number of magnetic moments. Effects of adsorption of atmospheric gases on the observed properties are analyzed. (C) 2020 Elsevier Ltd. All rights reserved.
机译：通过电子顺磁共振（EPR）光谱法在4.2-300k中的电子顺磁共振（EPR）光谱法研究了通过水热还原而获得的部分氧化石墨烯考虑到这种额外的吸收以确定EPR光谱的正确强度。 PRGO的EPR光谱由宽且窄的组件组成。高于100 k，宽部件的强度表现出居里 - 韦斯行为，但低于100 k，沿着居里法揭示了反铁磁性相关的消失。首次，观察到具有降低温度的窄EPR信号强度的异常强劲增加。通过传导电子在PRGO的缺陷结晶结构中的传导电子的局部化解释了这种效果。由于旋转密度低，局部电子变为隔离，并且它们的磁化率跟随居里定律，伴随温度依赖性磁矩。分析了对观察性质对大气气体吸附的影响。 （c）2020 elestvier有限公司保留所有权利。

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