期刊
JOURNAL OF RAMAN SPECTROSCOPY
卷 53, 期 9, 页码 1533-1539出版社
WILEY
DOI: 10.1002/jrs.6408
关键词
bandgap; monochromatic light; pararealgar; Raman spectrum; realgar
类别
资金
- National Natural Science Foundation of China [11874084]
- National Key Research Development Program of China [2020YFF0305404]
This study investigates the effect of light with different wavelengths on realgar, a well-known light-sensitive material. It is found that realgar is stable under red light but sensitive to amber, green, and blue light. The fastest light-induced reaction of realgar occurs under green light, while the effect of blue light on realgar is more complicated.
Realgar is a well-known light-sensitive material. Under illumination, realgar is oxidized into arsenolite and uzonite, and uzonite generates pararealgar. To further study the effect of light with different wavelengths on realgar, herein, the light-induced reaction of realgar under irradiation of four monochromatic visible lights, red light (628.0-648.0 nm), amber light (585.4-604.6 nm), green light (506.0-544.0 nm), and blue light (428.9-447.1 nm), have been studied by confocal Raman, X-ray diffraction, and ultraviolet-visible absorption spectroscopy. The results of Raman spectra show that the photoinduced effect of different monochromatic lights on realgar is different. Realgar is stable under red light but is sensitive to other visible lights like amber, green, and blue light. The light-induced reaction of realgar is the fastest under the green light. The effect of the blue light on realgar is complicated. Pararealgar, as the light-induced product of realgar, transforms into uzonite under the blue light, which is discussed based on the bandgap of pararealgar calculated using the density functional theory method.
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