Rodríguez-Fernández Jonathan, Lauwaet Koen, Herranz Maria Ángeles, Martín Nazario, Gallego José María, Miranda Rodolfo, Otero Roberto
Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
IMDEA Nanoscience, c∖Faraday 9, Campus de Cantoblanco, 28049 Madrid, Spain.
J Chem Phys. 2015 Mar 14;142(10):101930. doi: 10.1063/1.4913326.
The deposition of tetracyanoethylene (TCNE) on Ag(111), both at Room Temperature (RT, 300 K) and low temperatures (150 K), leads to the formation of coordination networks involving silver adatoms, as revealed by Variable-Temperature Scanning Tunneling Microscopy. Our results indicate that TCNE molecules etch away material from the step edges and possibly also from the terraces, which facilitates the formation of the observed coordination networks. Moreover, such process is temperature dependent, which allows for different stoichiometric ratios between Ag and TCNE just by adjusting the deposition temperature. X-ray Photoelectron Spectroscopy and Density Functional Theory calculations reveal that charge-transfer from the surface to the molecule and the concomitant geometrical distortions at both sides of the organic/inorganic interface might facilitate the extraction of silver atoms from the step-edges and, thus, its incorporation into the observed TCNE coordination networks.
可变温度扫描隧道显微镜显示，在室温（RT，300K）和低温（150K）下，四氰基乙烯（TCNE）在Ag(111)上的沉积会导致涉及银吸附原子的配位网络形成。我们的结果表明，TCNE分子会从台阶边缘以及可能也从平台上蚀刻掉物质，这有利于观察到的配位网络的形成。此外，这种过程与温度有关，仅通过调节沉积温度就可以实现Ag和TCNE之间不同的化学计量比。X射线光电子能谱和密度泛函理论计算表明，从表面到分子的电荷转移以及有机/无机界面两侧伴随的几何畸变可能有助于从台阶边缘提取银原子，从而将其纳入观察到的TCNE配位网络中。
