Fullerene adlayers on various single-crystal metal surfaces prepared by transfer from L films.
Fullerene adlayers prepared by the simple Langmuir-Blodgett (LB) method onto various well-defined single-crystal metal surfaces were investigated by in situ scanning tunneling microscopy (STM). The surface morphologies of fullerene adsorbed onto metal surfaces depended largely on the adsorbate-substrate interactions, which are governed by the types of surfaces. Too weak adsorption of C60 molecules onto iodine-modified Au(111) (I/Au(111)) allows surface migration of the molecules, and then, STM cannot visualize the C60 molecules. Stronger and appropriate adsorption onto bare Au(111) leads to highly ordered arrays relatively easily due to the limited surface migration of C60. On iodine-modified Pt(111) (I/Pt(111)) and bare Pt(111) surfaces, which have stronger adsorption, randomly adsorbed molecular adlayers were observed. Although C60 molecules on Au(111) were visualized as a featureless ball due to the maintenance of the rapid rotational motion (perturbation) of C60 on the surface at room temperature, those on I/Pt(111) revealed the intramolecular structures, thus indicating that the perturbation motion of molecules on the surface was prohibited.
Department of Applied Chemistry & Biochemistry, Faculty of Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan.
Shinobu
S
Uemura
Masayo
M
Sakata
Chuichi
C
Hirayama
Masashi
M
Kunitake
D000327:Adsorption; D003460:Crystallization; D037741:Fullerenes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D007455:Iodine / Q000737:chemistry; D008567:Membranes, Artificial; D010316:Particle Size; D044367:Phase Transition; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties
D037741:Fullerenes; D008567:Membranes, Artificial; D010984:Platinum; D006046:Gold; D007455:Iodine