کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1483088 | 1510527 | 2008 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Photochromic behavior of Li-stabilized MoO3 sol–gels Photochromic behavior of Li-stabilized MoO3 sol–gels](/preview/png/1483088.png)
Photochromic behavior of Li-doped MoO3 sol–gels prepared by the peroxo sol–gel method was studied in details using various experimental techniques, including UV–vis, XRD, Raman, EPR, and XPS. The lithium doping has drastically enhanced the stability of the MoO3 sol–gels. Upon UV-light irradiation from a high-pressure mercury lamp, the Li-doped MoO3 sol turned from yellowish into deep blue, and the sol in ethanol exhibited much more intense color change than the sol in water. The UV-light exposure has the effect of re-arranging the structural units of MoO3 and building up short-range order inside the solid. The formation of a blue colored bronze in the photo-irradiated sols because of the reduction of Mo6+ to Mo5+ is also evidenced by the experimental data. Based on these data, a mechanism for the photochromic behavior is proposed.
Journal: Journal of Non-Crystalline Solids - Volume 354, Issues 12–13, 15 February 2008, Pages 1276–1280