OPCOT在Ru(0001)表面上的紫外光电子能谱研究

UPS studies of OPCOT on Ru (0001)

采用紫外光电子能谱 ,研究了新型有机发光材料八芳基环辛四烯 (OPCOT)在金属Ru(0 0 0 1 )表面上的电子结构 ,以及它们之间的相互作用 .位于费米能级以下 4 3,6 9,9 3和 1 1 4eV处的 4个谱峰分别来自于OPCOT材料中苯环的πCC,σCC,σCH 和σHH 轨道 ,位于 3 0eV处的谱峰反映了 8个苯环聚合后具有π轨道特性的C—C键 .OPCOT材料的价带顶位于费米能级以下 2 5eV处 ,OPCOT材料在Ru(0 0 0 1 )表面上的功函数为 3 95eV .1 5 0℃以下 ,OPCOT材料可以在Ru(0 0 0 1 )表面稳定存在 .随温度的升高 。

The electronic structures and the interaction at the interface between octaaryl cyclooctatetrene (OPCOT) and Ru (0001) surface have been studied by ultraviolet photoelectron spectroscopy. The peaks at 4 3, 6 9, 9 3 and 11 4eV below the Fermi level are attributed to the π CC ,σ CC ,σ CH and σ HH orbits in the phenyls of OPCOT, respectively, and the peak at 3 0eV below the Fermi level is attributed to the C—C band with π characteristic orbit derived from OPCOT containing eight phenyls. The top of the valence band of OPCOT material is at 2 5 eV below Fermi level, the energy gap for OPCOT material can be larger than 2 5eV. The work function of OPCOT on Ru (0001) surface was obtained, which is 3 95 eV, less than that of clean Ru (0001) surface (4 2eV). The OPCOT material can be adsorbed on Ru (0001) surface stably below 150℃ and starts desorption with further annealing.