Università degli Studi della Calabria, Dipartimento di Fisica, Italy.
Nanoscale. 2013 Sep 7;5(17):8215-20. doi: 10.1039/c3nr02027d.
Plasmonic excitations in pristine and air-exposed graphene-Ru and graphene-Pt contacts have been investigated by using high-resolution electron energy loss spectroscopy. Loss measurements show that the effects of air exposure are very different in these two systems. While in graphene-Ru contacts, plasmons are completely quenched, plasmons in the graphene-Pt interface show only a frequency shift together with an overall intensity attenuation. These results pose significant questions as regards the stability in an ambient air atmosphere of graphene-based plasmonic devices and indicate a suitable choice of graphene-metal contacts.
采用高分辨率电子能量损失谱研究了原始和暴露于空气中的石墨烯-Ru 和石墨烯-Pt 接触中的等离激元激发。损耗测量表明，在这两个系统中，空气暴露的影响非常不同。在石墨烯-Ru 接触中，等离激元完全猝灭，而在石墨烯-Pt 界面中的等离激元仅显示频率移动以及整体强度衰减。这些结果对基于石墨烯的等离子体器件在大气环境中的稳定性提出了重大问题，并表明了石墨烯-金属接触的合适选择。
