Synthesis of Polymerized C60 Bulk and Film in Three Dimensions by Irradiating Free-Electron Laser
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概要
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Pressed C60 powder was polymerized with free-electron laser (FEL) irradiation. Brightened grains were synthesized in part at the sample surface, the Raman spectrum of which indicated the polymerization. It was noted that polymerization occurred as a result of irradiating a third harmonic FEL at 500 nm with an extremely low energy density of 2.6 μJ/(pulse$\cdot$cm2). The polymerization is considered to be due to the micropulse width less than one ps forming the 20 μs macropulse of the FEL. Irradiating FEL during film growth, at 200 °C in particular, promoted the polymerization, as demonstrated by the Raman spectrum. The X-ray diffraction showed an oriented hcp structure with the relationship that the [0001] direction of the film was normal to the surface. However, Bragg reflection peaks did not shift in the film grown with FEL irradiation. These results indicate that the polymerized structure is a two-dimensional (2D) rhombohedron in the film plane. We expect that the (0001) surface of the oriented film will be suitable for a 2D polymerized rhombohedron and that migration energy will contribute to polymerization at an elevated temperature.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2008-02-25
著者
-
Iwata Nobuyuki
Department Of Electronics & Computer Science College Of Science & Technology Nihon Universit
-
Yamamoto Hiroshi
Departmemt Of Chemical Engineering University Of Tokyo
-
Ando Shingo
Department of Electronics and Computer Science, College of Science and Technology, Nihon University, 7-24-1 Narashinodai, Funabashi, Chiba 274-8501, Japan
-
Nokariya Ryo
Department of Electronics and Computer Science, College of Science and Technology, Nihon University, 7-24-1 Narashinodai, Funabashi, Chiba 274-8501, Japan
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Yamamoto Hiroshi
Department of Electronics and Computer Science, College of Science and Technology, Nihon University, 7-24-1 Narashinodai, Funabashi, Chiba 274-8501, Japan
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