Real-time decay of fluorinated fullerene molecules on Cu（001） surface controlled by initial coverage  

作　　者：Andrey I. Oreshkin Dmitry A. Muzychenko Sergey I. Oreshkin Vladimir A. Yakovlev Palanichamy Murugan S. Selva Chandrasekaran Vijay Kumar Rauf Z. Bakhtizin 

机构地区：[1]Department of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia [2]Sternberg Astronomical Institute, Lomonosov Moscow State University, 119234 Moscow, Russia [3]Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991 Moscow, Russia [4]CSIR Central Electrochemical Research Institute, Karaikudi 630003, Tamil Nadu, India [5]Dr. Vijay Kumar Foundation, 1969 Sector 4, Gurgaon 122001, Haryana, India [6]Center for Informatics, School of Natural Sciences, Shiv Nadar University, NH91, Tehsil Dadari, Gautam Budh Nagar 201314, Uttar Pradesh, India [7]Department of Physical Electronics, Bashkir State University, 450074 Ufa, Russia

出　　处：《Nano Research》2018年第4期2069-2082,共14页纳米研究（英文版）

摘　　要：In this study, the evolution of C60F18 molecules on a Cu（001） surface was studied by means of scanning tunneling microscopy and density functional theory calculations. The results showed that fluorinated fuUerenes （tortoise-shaped polar C60F18） decay on Cu（001） surfaces by a step-by-step detachment of F atoms from the C60 cage. The most favorable adsorption configuration was realized when the F atoms of C60F18 pointed towards the Cu surface and six F atoms were detached from it. The results also showed that a further decay of C60F12 molecules strongly depended on the initial C60F18 coverage. The detached F atoms initially formed a two-dimensional （2D） gas phase which then slowly transformed into F-induced surface structures. The degree of contact between the C60F12 molecules and the Cu（001） surface depended on the density of the 2D gas phase. Hence, the life-time of fluorinated fullerenes was determined by the density of the 2D gas phase, which was affected by the formation of new F-induced structures and the decay of C60F12 molecules.In this study, the evolution of C60F18 molecules on a Cu（001） surface was studied by means of scanning tunneling microscopy and density functional theory calculations. The results showed that fluorinated fuUerenes （tortoise-shaped polar C60F18） decay on Cu（001） surfaces by a step-by-step detachment of F atoms from the C60 cage. The most favorable adsorption configuration was realized when the F atoms of C60F18 pointed towards the Cu surface and six F atoms were detached from it. The results also showed that a further decay of C60F12 molecules strongly depended on the initial C60F18 coverage. The detached F atoms initially formed a two-dimensional （2D） gas phase which then slowly transformed into F-induced surface structures. The degree of contact between the C60F12 molecules and the Cu（001） surface depended on the density of the 2D gas phase. Hence, the life-time of fluorinated fullerenes was determined by the density of the 2D gas phase, which was affected by the formation of new F-induced structures and the decay of C60F12 molecules.

关 键 词：fluorinated fullerene （001） Cu surface two-dimensional （2D）molecular island 2D gas phase self-assembling molecules scanning tunneling microscopy （STM） density functional theory（DFT） 

分 类 号：O484[理学—固体物理] TQ571.9[理学—物理]