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首页> 外文期刊>Applied Surface Science >Molybdenum oxide nanosheets prepared by an anodizing-exfoliation process and observation of photochromic properties
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Molybdenum oxide nanosheets prepared by an anodizing-exfoliation process and observation of photochromic properties

机译：通过阳极氧化剥落工艺制备的氧化钼纳米片及光致变色特性的观察

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Anodizing-exfoliation of molybdenum foil was performed in 0.02 M HCI electrolyte at 30 V. In this process, the electrolyte rapidly turned into a blue colloidal solution of molybdenum oxide nanosheets with fragmented edges observed on transmission electron microscope (TEM). X-ray Diffraction (XRD) pattern of particles was free of peak while annealing at a temperature range of 100-500 degrees C led to formation of monoclinic (for T < 300 degrees C) and orthorhombic (for T > 300 degrees C) phases of MoO3. Moreover, addition of PdCl2 (0.2 g/l) salt solution caused a spontaneous bleaching of the initial blue colloid. Annealing of powders extracted from these bleached solutions with different PdCl2 concentrations at 500 degrees C led to a preferential growth of (0k0) orientation. X-ray photoelectron spectroscopy (XPS) revealed that the blue nanosheets solution contains mainly Mo5+ with slightly Mo6+ oxidation states and each of annealing or salt bleaching procedures can entirely convert Mo5+ to Mo6+. When the bleached solutions was exposed to KrF laser beam (lambda = 248 nm) a strong photochromic coloration with a deep blue color was occurred. Regardless of Pd: Mo ratio, the primary and laser irradiated solutions showed analogues optical absorption bands in the 1-3 nm photon energy range while the photochromic process led to a broader absorption band. (C) 2016 Elsevier B.V. All rights reserved.
机译：钼箔在30 V的0.02 M HCl电解液中进行阳极氧化剥落。在此过程中，电解液迅速转变为氧化钼纳米片的蓝色胶体溶液，在透射电子显微镜（TEM）上观察到边缘破碎。颗粒的X射线衍射（XRD）模式没有峰，而在100-500摄氏度的温度范围内退火导致形成单斜相（对于T <300摄氏度）和正交晶相（对于T> 300摄氏度） MoO3。此外，添加PdCl2（0.2 g / l）盐溶液会导致初始蓝色胶体自发漂白。从这些漂白溶液中提取的粉末在500摄氏度下以不同的PdCl2浓度进行退火导致（0k0）取向的优先增长。 X射线光电子能谱（XPS）显示，蓝色纳米片溶液主要包含具有轻微Mo6 +氧化态的Mo5 +，并且每一种退火或盐漂白程序都可以将Mo5 +完全转化为Mo6 +。当漂白的溶液暴露于KrF激光束（λ= 248 nm）时，会发生深蓝色的强光致变色。不管Pd：Mo的比例如何，初次和激光照射的溶液在1-3 nm光子能量范围内均显示类似物的光吸收带，而光致变色过程导致了更宽的吸收带。 （C）2016 Elsevier B.V.保留所有权利。

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