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Si(111)7×7表面Gd@C82分子的STM研究
Scanning Tunneling Microscopy Study of Gd@C82 on Si(111) 7×7 Surface
【摘要】 用超高真空扫描隧道显微镜(UHV-STM)研究了金属富勒烯分子Gd@C82在Si(111)7×7重构表面的吸附特性和电学特性。STM形貌像显示Gd@C82分子和Si基底之间相互作用较强,Gd@C82分子吸附在Si基底的三种特定的位置上,其中在Si(111)7×7单胞内三个顶戴原子间的吸附位最稳定。扫描隧道谱(STS)的测量显示Gd@C82分子呈现半导体特性。分子表面局域电子态密度(LDOS)在Gd附近受到Gd与碳笼间电子转移的影响,发生显著变化。
【Abstract】 Structures and electronic properties of the endohedral metallofullerence,Gd@C82,adsorbed on Si(111) reconstructed surface was studied with ultrahigh vacuum scanning tunneling microscopy(UHV-STM).STM images show that the adsorbed Gd@C82 molecules display semi-conducting properties and above the three adatoms in the 7×7 unit cell is the preferential,stable adsorption site.Moreover,electron transfer between Gd and C82 cage strongly affects local desity of states(LDOS) of Gd@C82.
【关键词】 Gd@C82;
扫描隧道显微镜(STM);
扫描隧道谱(STS);
Si(111)7×7;
【Key words】 Gd@C82; Scanning tunneling microscopy(STM); Scanning tunneling spectroscopy(STS); Si(111) 7×7;
【Key words】 Gd@C82; Scanning tunneling microscopy(STM); Scanning tunneling spectroscopy(STS); Si(111) 7×7;
【基金】 国家自然科学基金(No.50202001,90406014,20371004,60371005);国家重点基础研究资助项目(No.2001CB610503)
- 【文献出处】 真空科学与技术学报 ,Chinese Journal of Vacuum Science and Technology , 编辑部邮箱 ,2006年01期
- 【分类号】O613.72
- 【被引频次】1
- 【下载频次】161