Comparative electron paramagnetic resonance investigation of reduced graphene oxide and carbon nanotubes with different chemical functionalities for quantum dot attachment
Comparative electron paramagnetic resonance investigation of reduced graphene oxide and carbon nanotubes with different chemical functionalities for quantum dot attachment
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DOI：
10.1063/1.4870297
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发表时间：
2014-03-31
影响因子：
4
通讯作者：
Erdem, Emre
中科院分区：
文献类型：
--
作者：
Pham, Chuyen V.;Krueger, Michael;Erdem, Emre
电子顺磁共振（EPR）光谱已应用于不同的化学处理的还原氧化石墨烯（rGO）和多壁碳纳米管（CNT）。窄EPR信号在g = 2.0029处在GO和CNT-氧化物两者中从碳相关悬挂键可见。在含氧官能团被还原并部分转化为硫醇基团以分别获得硫醇官能化的还原GO（TrGO）和硫醇官能化的CNT（CNT-SH）之后，EPR信号变得更宽且强度更低。此外，CdSe量子点-TrGO混合材料的EPR研究揭示了由于直接化学附着和电子耦合导致的TrGO EPR信号的完全淬灭。我们的工作证实，EPR是一个合适的工具来检测自旋密度的变化，在不同的功能化纳米碳材料，可以有助于提高理解的电子耦合效应的纳米碳-纳米粒子混合纳米复合材料有希望为各种电子和光电应用。(C)2014 AIP Publishing LLC.
Electron paramagnetic resonance (EPR) spectroscopy has been applied to different chemically treated reduced graphene oxide (rGO) and multiwalled carbon nanotubes (CNTs). A narrow EPR signal is visible at g = 2.0029 in both GO and CNT-Oxide from carbon-related dangling bonds. EPR signals became broader and of lower intensity after oxygen-containing functionalities were reduced and partially transformed into thiol groups to obtain thiol-functionalized reduced GO (TrGO) and thiol-functionalized CNT (CNT-SH), respectively. Additionally, EPR investigation of CdSe quantum dot-TrGO hybrid material reveals complete quenching of the TrGO EPR signal due to direct chemical attachment and electronic coupling. Our work confirms that EPR is a suitable tool to detect spin density changes in different functionalized nanocarbon materials and can contribute to improved understanding of electronic coupling effects in nanocarbon-nanoparticle hybrid nano-composites promising for various electronic and optoelectronic applications. (C) 2014 AIP Publishing LLC.