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Effect of electrolyte concentration on morphological and photoluminescence properties of free standing porous anodic alumina membranes formed in oxalic acid

机译:电解液浓度对草酸中形成的自由静态多孔阳极氧化铝膜的形态学和光致发光性能的影响

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The free-standing porous anodic alumina membranes (AAM) were prepared in oxalic acid by varying electrolyte concentration from 0.1 to 0.9 M with a constant potential of 40 Vat 8 degrees C. The influence of electrolyte concentration on the morphological and optical features of AAM has been studied. Regularity ratio (RR) of AAM was measured using WSxM software, highest RR obtained for AAM formed in 0.3 M. From X-ray diffraction (XRD) analysis, it was found that prepared AAM were amorphous in nature. UV-Vis absorbance spectra reveal that absorbance bands slightly moves towards the higher wavelength side with increasing electrolyte concentration. Photoluminescence (PL) of AAM has been studied and related with RR of AAM. PL measurements of AAM exhibit strong PL peak in blue region, having a slight change with increasing electrolyte concentration. PL bands were originating from two kinds of oxygen-deficient defects (F and F+), their distributions were discussed on the basis of PL spectrum.
机译:通过0.1至0.9μm的电解质浓度从0.1至0.9μg的电解质浓度的恒定电位的恒定电位,在40 vAT 8℃下,在草酸中制备独立的多孔阳极氧化铝膜(AAM)。电解质浓度对AAM的形态学和光学特征的影响 已经研究过。 使用WSXM软件测量AAM的规律性比(RR),获得0.3米的AAM的最高RR。来自X射线衍射(XRD)分析,发现制备的AAM本质上是无定形的。 UV-Vis吸光度光谱显示,吸光度带随着电解质浓度的增加而略微向较高波长侧移动。 研究了AAM的光致发光(PL)并与AAM的RR相关。 P1测量AAM在蓝色区域中表现出强PL峰,随着电解质浓度的增加而略有变化。 PL带源自来自两种缺氧缺陷(F和F +),在PL光谱的基础上讨论了它们的分布。

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