Identification of a Slowly Relaxing Paramagnetic Center in Graphene Oxide

被引：17

作者：

Augustyniak-Jablokow, Maria A. ^{[1
]}

Fedaruk, Ryhor ^{[2
]}

Strzelczyk, Roman ^{[1
]}

Majchrzycki, Lukasz ^{[3
]}

机构：

[1] Polish Acad Sci, Inst Mol Phys, Smoluchowski Str 17, PL-60179 Poznan, Poland

[2] Univ Szczecin, Fac Math & Phys, Inst Phys, Wielkopolska Str 15, PL-70451 Szczecin, Poland

[3] Adam Mickiewicz Univ, Wielkopolska Ctr Adv Technol, Ul Umultowska 89 C, PL-61614 Poznan, Poland

来源：

APPLIED MAGNETIC RESONANCE | 2019年 / 50卷 / 06期

关键词：

SPIN RELAXATION; RESONANCE; EPR; REDUCTION; CHEMISTRY; RADICALS;

D O I：

10.1007/s00723-018-1058-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

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.

引用

页码：761 / 768

页数：8

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