Self-assembled organic monolayers on epitaxial graphene with enhanced structural and thermal stability.
Self-assembled organic monolayers on epitaxial graphene with enhanced structural and thermal stability.
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DOI：
10.1039/c4cc02761b
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发表时间：
2014-07
影响因子：
4.9
通讯作者：
Hunter J. Karmel;J. J. Garramone-J.;Jonathan D Emery;S. Kewalramani;M. Bedzyk;M. Hersam
中科院分区：
文献类型：
--
作者：
Hunter J. Karmel;J. J. Garramone-J.;Jonathan D Emery;S. Kewalramani;M. Bedzyk;M. Hersam
使用扫描隧道显微镜和x射线反射率来表征沉积在SiC（0001）外延石墨烯（EG）上的苝四羧基二亚胺（PTCDI）层。PTCDI在EG/SiC上采用人字形结构相，在室温下可以容纳具有分子边界和隔离分子空位的5 nm以下的空洞。PTCDI单层在~260°C的衬底温度下保持完整，因此与先前研究的EG/SiC上的苝衍生物相比，显示出更高的热稳定性。
Scanning tunnelling microscopy and X-ray reflectivity are used to characterize adlayers of perylenetetracarboxylic diimide (PTCDI) deposited on epitaxial graphene (EG) on SiC(0001). PTCDI adopts a herringbone structural phase on EG/SiC that can accommodate sub-5 nm voids with molecularly defined boundaries and isolated molecular vacancies at room temperature. The PTCDI monolayer remains intact up to substrate temperatures of ~260 °C, thus demonstrating enhanced thermal stability compared to previously studied perylene derivatives on EG/SiC.