Institute of Technical Physics and Materials Science, MFA, Centre for Energy Research, Hungarian Academy of Sciences, 1525 Budapest, P.O. Box 49, Hungary.
Nanoscale. 2018 Jul 19;10(28):13417-13425. doi: 10.1039/c8nr02848f.
Graphene on noble-metal nanostructures constitutes an attractive nanocomposite with possible applications in sensors or energy conversion. In this work we study the properties of hybrid graphene/gold nanoparticle structures by Raman spectroscopy and scanning probe methods. The nanoparticles (NPs) were prepared by local annealing of gold thin films using a focused laser beam. The method resulted in a patterned surface, with NPs formed at arbitrarily chosen microscale areas. Graphene grown by chemical vapour deposition was transferred onto the prepared, closely spaced gold NPs. While we found that successive higher intensity (6 mW) laser irradiation increased gradually the doping and the defect concentration in SiO2 supported graphene, the same irradiation procedure did not induce such irreversible effects in the graphene supported by gold NPs. Moreover, the laser irradiation induced a dynamic hydrostatic strain in the graphene on Au NPs, which turned out to be completely reversible. These results can have implications in the development of graphene/plasmonic nanoparticle based high temperature sensors operating in dynamic regimes.
在纳米复合材料领域，石墨烯负载于贵金属纳米结构上是一种很有前景的复合材料，在传感器或能量转换方面具有潜在的应用。在这项工作中，我们通过拉曼光谱和扫描探针方法研究了杂化石墨烯/金纳米粒子结构的性质。通过使用聚焦激光束对金薄膜进行局部退火制备了纳米粒子（NPs）。该方法导致表面图案化，在任意选择的微尺度区域形成 NPs。通过化学气相沉积生长的石墨烯转移到制备的、紧密间隔的金 NPs 上。虽然我们发现，随着激光强度（6 mW）的增加，SiO2 支撑的石墨烯中的掺杂和缺陷浓度逐渐增加，但相同的辐照程序在金 NPs 支撑的石墨烯中没有诱导出这种不可逆的影响。此外，激光辐照在 Au NPs 上的石墨烯中诱导出动态静水压力应变，而这种应变是完全可逆的。这些结果可能对开发基于石墨烯/等离子体纳米粒子的高温传感器在动态环境下的应用具有重要意义。
