Laser-induced coloration of WO3

被引：38
|
作者：
Zhao, Y [1 ]
Feng, ZC [1 ]
Liang, Y [1 ]
Sheng, HW [1 ]
机构：
[1] ACAD SINICA,INST MET RES,NATL KEY LAB RSB,SHENYANG 110015,PEOPLES R CHINA
来源：
APPLIED PHYSICS LETTERS | 1997年 / 71卷 / 16期
关键词：
D O I：
10.1063/1.120064
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
It has long been recognized that WO3 can be colored through electro-, photo-, and thermo-chromism processes. We report here that WO3 turned to a deep blue color upon just one pulse irradiation of the XeCl excimer laser (lambda = 308 nm, pulse duration = 36 ns, output energy = 100 mJ/pulse). Scanning electron microscopy (SEM) images showed that a melted layer was formed on the surface of the sample. The color change was demonstrated by UV-visible diffuse reflectance. X-ray photoelectron spectroscopy (XPS) showed the partial reduction of WO3 and the appearance of conduction band electrons. Calorimetry measurement results indicated that reoxidation happened at 400-440 degrees C in air. From these experimental results combining with the calculation, it was concluded that the laser-induced coloration is different from ordinary photochromism induced by UV light, and may be attributed to thermochromism. (C) 1997 American Institute of Physics.
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页码：2227 / 2229
页数：3
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