In this work, we report a one-step method for the preparation of graphene-wrapped zinc oxide (ZnO) nanoparticle (NP) ([email protected]) hybrids. These hybrids are characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, optical absorption measurements, photoluminescence (PL) emission spectroscopy, and M–H hysteresis measurements. All results reveal that the ZnO NPs are entirely covered with graphene sheets. In the PL spectra, the quenching of the band gap emission and the enhanced green emission serve as evidence of the electron transfer from the ZnO NPs to the graphene layer. The increase of the room-temperature magnetization of the hybrid, compared to pure ZnO NPs, is due to the increasing defect concentration. We suggest a band diagram model that accounts for these observations. We present the simple wet-chemical synthesis procedure to open a new way for the synthesis of NP–graphene hybrid systems having magnetic properties giving the large manifold potential application.

中文翻译：

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石墨烯包裹的ZnO纳米粒子杂化物的光学和磁学性质研究

在这项工作中，我们报告了一种制备石墨烯包裹的氧化锌（ZnO）纳米颗粒（NP）（[受电子邮件保护]）杂化物的一步法。这些杂化物的特征在于透射电子显微镜，X射线衍射，拉曼光谱，光吸收测量，光致发光（PL）发射光谱和M – H磁滞测量。所有结果表明，ZnO NPs完全被石墨烯片覆盖。在PL光谱中，带隙发射的猝灭和增强的绿色发射充当电子从ZnO NPs转移到石墨烯层的证据。与纯ZnO NPs相比，杂化物的室温磁化强度增加是由于缺陷浓度增加所致。我们建议一个能解释这些观察结果的能带图模型。我们提出了一种简单的湿化学合成方法，从而为具有磁性的NP-石墨烯杂化系统的合成开辟了一条新途径，从而提供了广阔的应用前景。