Piszter Gábor, Molnár György, Pálinkás András, Osváth Zoltán
Centre for Energy Research, Institute of Technical Physics and Materials Science, 1121 Budapest, Hungary.
Nanomaterials (Basel). 2022 Jul 19;12(14):2473. doi: 10.3390/nano12142473.
Graphene-covered silver nanoparticles were prepared directly on highly oriented pyrolytic graphite substrates and characterized by atomic force microscopy. UV-Vis reflectance spectroscopy was used to measure the shift in the local surface plasmon resonance (LSPR) upon exposure to acetone, ethanol, 2-propanol, toluene, and water vapor. The optical responses were found to be substance-specific, as also demonstrated by principal component analysis. Point defects were introduced in the structure of the graphene overlayer by O plasma. The LSPR was affected by the plasma treatment, but it was completely recovered using subsequent annealing. It was found that the presence of defects increased the response for toluene and water while decreasing it for acetone.
在高度取向的热解石墨基底上直接制备了石墨烯包覆的银纳米颗粒，并通过原子力显微镜对其进行了表征。利用紫外可见反射光谱测量了暴露于丙酮、乙醇、异丙醇、甲苯和水蒸气时局部表面等离子体共振（LSPR）的位移。主成分分析也表明，光学响应具有物质特异性。通过氧等离子体在石墨烯覆盖层结构中引入点缺陷。等离子体处理影响了LSPR，但通过随后的退火处理它完全恢复了。结果发现，缺陷的存在增加了对甲苯和水的响应，同时降低了对丙酮的响应。
