STRUCTURE AND PROPERTIES OF THERMALLY ANNEALED FULLERENE FILMS

被引：19

作者：

AKSELROD, L

BYRNE, HJ

SUTTO, TE

ROTH, S

机构：

[1] Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 233卷 / 04期

关键词：

D O I：

10.1016/0009-2614(94)01460-D

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effects of postdeposition thermal annealing on the structure and properties of C-60 films are investigated. Non-oxygenated C-60 films are heated at 200 degrees C under vacuum. UV/visible absorption spectroscopy shows a decrease in the intensities of the allowed transitions and a red-shift of up to 50 nm. IR analyses show no indication of chemical alteration of the sample. X-ray studies reveal cubic symmetry in the unannealed thin films, while the annealed films show a mixture of face-centred cubic and hexagonal close-packed phases and a higher degree of crystallinity. Room-temperature Raman studies in the region of the pentagonal pinch mode reveal the presence of two components. The first component, at 1468 cm(-1), is photochemically unstable, as is the pristine material. The second component, positioned at 1464 cm(-1), remains stable under prolonged low-intensity illumination. The effects of thermal annealing of oxygen-free films are contrasted to those of thermal treatment under oxygen and it is concluded that the modifications are structural in nature.

引用

页码：436 / 443

页数：8

共 31 条

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