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Novel graphene/Sn and graphene/SnO x hybrid nanostructures: Induced superconductivity and band gaps revealed by scanning probe measurements
Carbon ( IF 10.9 ) Pub Date : 2017-11-01 , DOI: 10.1016/j.carbon.2017.09.026
András Pálinkás , György Molnár , Gábor Zsolt Magda , Chanyong Hwang , Levente Tapasztó , Peter Samuely , Pavol Szabó , Zoltán Osváth

Abstract The development of functional composite nanomaterials based on graphene and metal nanoparticles (NPs) is currently the subject of intense research interest. In this study we report the preparation of novel type of graphene/Sn and graphene/SnOx (1 ≤ x ≤ 2) hybrid nanostructures and their investigation by scanning probe methods. First, we prepare Sn NPs by evaporating 7–8 nm tin on highly oriented pyrolytic graphite substrates. Graphene/Sn nanostructures are obtained by transferring graphene on top of the tin NPs immediately after evaporation. We show by scanning tunnelling microscopy (STM) and spectroscopy (STS) that tin NPs reduce significantly the environmental p-type doping of graphene. Furthermore, we demonstrate by low-temperature STM and STS measurements that superconductivity is induced in graphene, either directly supported by Sn NPs or suspended between them. Additionally, we prepare SnOx NPs by annealing the evaporated tin at 500 °C. STS measurements performed on hybrid graphene/SnOx nanostructures reveal the electronic band gap of SnOx NPs. The results can open new avenues for the fabrication of novel hybrid superconducting nanomaterials with designed structures and morphologies.

中文翻译:

新型石墨烯/Sn 和石墨烯/SnO x 混合纳米结构:通过扫描探针测量揭示的诱导超导性和带隙

摘要 基于石墨烯和金属纳米粒子 (NPs) 的功能复合纳米材料的开发是目前研究的热点。在这项研究中,我们报告了新型石墨烯/Sn 和石墨烯/SnOx (1 ≤ x ≤ 2) 混合纳米结构的制备及其通过扫描探针方法的研究。首先,我们通过在高度取向的热解石墨基材上蒸发 7-8 nm 锡来制备 Sn NP。石墨烯/锡纳米结构是通过在蒸发后立即将石墨烯转移到锡纳米颗粒上而获得的。我们通过扫描隧道显微镜 (STM) 和光谱学 (STS) 表明锡纳米颗粒显着降低了石墨烯的环境 p 型掺杂。此外,我们通过低温 STM 和 STS 测量证明石墨烯中诱导了超导性,要么直接由 Sn NPs 支撑,要么悬浮在它们之间。此外,我们通过在 500 °C 下对蒸发的锡进行退火来制备 SnOx NP。对混合石墨烯/SnOx 纳米结构进行的 STS 测量揭示了 SnOx NPs 的电子带隙。结果可以为制造具有设计结构和形态的新型混合超导纳米材料开辟新途径。
更新日期:2017-11-01
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