Vejpravova Jana, Pacakova Barbara, Endres Jan, Mantlikova Alice, Verhagen Tim, Vales Vaclav, Frank Otakar, Kalbac Martin
Institute of Physics CAS, v.v.i., Department of Magnetic Nanosystems, Na Slovance 2, 18221 Prague 2, Czech Republic.
Charles Univeristy in Prague, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 12116 Prague 2, Czech Republic.
Sci Rep. 2015 Nov 4;5:15061. doi: 10.1038/srep15061.
Controlled wrinkling of single-layer graphene (1-LG) at nanometer scale was achieved by introducing monodisperse nanoparticles (NPs), with size comparable to the strain coherence length, underneath the 1-LG. Typical fingerprint of the delaminated fraction is identified as substantial contribution to the principal Raman modes of the 1-LG (G and G'). Correlation analysis of the Raman shift of the G and G' modes clearly resolved the 1-LG in contact and delaminated from the substrate, respectively. Intensity of Raman features of the delaminated 1-LG increases linearly with the amount of the wrinkles, as determined by advanced processing of atomic force microscopy data. Our study thus offers universal approach for both fine tuning and facile quantification of the graphene topography up to ~60% of wrinkling.
通过在单层石墨烯（1-LG）下方引入尺寸与应变相干长度相当的单分散纳米颗粒（NPs），实现了纳米尺度下单层石墨烯的可控褶皱。分层部分的典型指纹被确定为对1-LG的主要拉曼模式（G和G'）有重大贡献。对G和G'模式的拉曼位移进行相关分析，清楚地分辨出分别与基底接触和分层的1-LG。通过原子力显微镜数据的先进处理确定，分层的1-LG的拉曼特征强度随褶皱数量线性增加。因此，我们的研究为高达约60%褶皱率的石墨烯形貌的微调与简便量化提供了通用方法。
