Evolution kinetics of sp2 ordering in tetrahedral amorphous carbon films induced by electron irradiation

被引：18

作者：

Liang, S ^{[1
]}

Yajima, A ^{[1
]}

Abe, S ^{[1
]}

Mera, Y ^{[1
]}

Maeda, K ^{[1
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Sch Engn, Bunkyo Ku, Tokyo 1138656, Japan

来源：

SURFACE SCIENCE | 2005年 / 593卷 / 1-3期

关键词：

electron energy loss spectroscopy (EELS); electron microscopy; electron solid diffraction; crystallization; electron bombardment; growth; carbon; amorphous thin films;

D O I：

10.1016/j.susc.2005.06.088

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 kinetics of SP3 to SP2 structural conversion in tetrahedral amorphous carbon (ta-C) films induced by sample irradiation with an electron beam of transmission electron microscope was studied by systematically measuring the temporal evolution of the graphitic phase detected by electron energy loss spectroscopy (EELS). The results analyzed in the framework of the Johnson-Mehl-Avrami model indicates that the phase front velocity increases in proportion to the irradiation beam current density, providing an experimental support for the notion that the effect is caused by an electronic excitation effect. It was inferred from the experimentally assessed kinetic order index that the three-dimensional growth of graphitic phases is enhanced by electronic excitations. Possible microscopic mechanisms are discussed. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：161 / 167

页数：7

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