Abstract
For the first time nanostructures of anodized aluminum oxide (AAO) were synthesized using hydrofluoric acid based electrolytes under potentiostatic mode with varied oxidation conditions. As-grown oxide layers were amorphous and had sponge-like disordered structure with ramified pores system of 50 to 300 nm diameters. All samples under daylight demonstrated blue emission with power up to 10 μW that was seen by naked eye. It was shown that integral intensity of photoluminescence (PL) emission band in 350 – 650 range increases up to 7 – 60 times depending on synthesis details. Observed PL spectra were approximated by superposition of two components with Emax = 2.74 and 2.44 eV, FWHM = 0.63 and 0.53 eV. It was substantiated that studied emission have intrinsic origin and can be attributed to F22+ - and F2-centers.
Highlights
Porous structures of anodized aluminum oxide (AAO) are widely used as templates for fabrication of ordered periodic arrays of 0D and 1D nanomaterials [1]
It can be concluded that registered peak is non-elementary since λmax maximum position changes in 440 to 480 range and differences in shape are present for various synthesis modes
It is in agreement with known data regarding values of λmax for AAO synthesized in oxalic acid – 420 nm [16], 430 nm [12], 450 nm [11], 480 nm [15] etc
Summary
Porous structures of AAO are widely used as templates for fabrication of ordered periodic arrays of 0D and 1D nanomaterials [1]. Numerous studies considering luminescent properties of anodic aluminum oxide synthesized in electrolytes of various type and composition have been conducted up to date [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. It is of current interest to search for optimal anodizing modes and electrolytes composition in order to obtain nanostructured oxide layers with high concentration of optically active defects formed due to developed surface with big specific area. The aim of this work was to study photoluminescent characteristics of highly porous AAO structures synthesized using hydrofluoric acid (HF) based electrolytes under varied conditions of electrochemical oxidation
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