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Identification of a Slowly Relaxing Paramagnetic Center in Graphene Oxide

机译：鉴定石墨烯氧化物中缓慢放松的顺磁中心

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摘要

We demonstrate the existence of two types of paramagnetic centers in a pure graphene oxide. Saturation features of the electron paramagnetic resonance (EPR) spectrum in the temperature range of 4.2-300K reveal that one of these centers has the spin-lattice relaxation time longer than 1.6s at room temperature. The spectrum of these centers consists of a central line and two satellite lines. The satellite lines result from the forbidden transitions in the hyperfine structure induced by protons in the vicinity of the slowly relaxing centers. The observability of the satellites can be used as a characteristic signature of graphene oxide purity. Since the number of slowly relaxing centers is reduced during chemical reduction of graphene oxide, this type of centers can be attributed to the isolated unfunctionalized carbons in the highly functionalized regions of GO. The second type of paramagnetic centers has shorter relaxation times and dominates in the reduced graphene oxide.
机译：我们展示了纯石墨烯氧化物中两种类型的顺磁性中心。 4.2-300K温度范围内的电子顺磁共振（EPR）光谱的饱和度特征揭示了这些中心中的一个在室温下的旋转晶格松弛时间超过1.6s。 这些中心的光谱由中央线和两条卫星线组成。 卫星线是由质子在缓慢松弛中心附近引起的超细结构中的禁止转变。 卫星的可观察性可用作石墨烯纯度的特征特征。 由于在石墨烯氧化物的化学降低过程中缓慢放松中心的数量减少，因此这种类型的中心可以归因于孤立的未互通的碳在高度官能化的GO中。 第二种类型的顺磁心具有较短的弛豫时间，并在石墨烯氧化物中占主导地位。

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