Valeš Václav, Drogowska-Horná Karolina, Guerra Valentino L P, Kalbáč Martin
J. Heyrovský Institute of Physical Chemistry, ASCR, v.v.i., Dolejškova 3, 182 23, Praha, Czechia.
Sci Rep. 2020 Mar 11;10(1):4516. doi: 10.1038/s41598-020-60857-y.
Graphene-enhanced Raman scattering (GERS) on isotopically labelled bilayer and a single layer of pristine and partially hydrogenated graphene has been studied. The hydrogenated graphene sample showed a change in relative intensities of Raman bands of Rhodamine 6 G (R6G) with different vibrational energies deposited on a single layer and bilayer graphene. The change corresponds qualitatively to different doping of graphene in both areas. Pristine graphene sample exhibited no difference in doping nor relative intensities of R6G Raman peaks in the single layer and bilayer areas. Therefore, it was concluded that strain and strain inhomogeneities do not affect the GERS. Because of analyzing relative intensities of selected peaks of the R6G probe molecules, it is possible to obtain these results without determining the enhancement factor and without assuming homogeneous coverage of the molecules. Furthermore, we tested the approach on copper phtalocyanine molecules.
对同位素标记的双层以及单层原始和部分氢化石墨烯上的石墨烯增强拉曼散射（GERS）进行了研究。氢化石墨烯样品显示，沉积在单层和双层石墨烯上的具有不同振动能量的罗丹明6G（R6G）拉曼带的相对强度发生了变化。这种变化在定性上对应于两个区域中石墨烯的不同掺杂情况。原始石墨烯样品在单层和双层区域的掺杂以及R6G拉曼峰的相对强度均无差异。因此，得出结论：应变和应变不均匀性不会影响GERS。由于分析了R6G探针分子选定峰的相对强度，无需确定增强因子且无需假设分子的均匀覆盖就能获得这些结果。此外，我们还对铜酞菁分子测试了该方法。
