Photoluminescence enhancement and morphological properties of nanoporous anodic alumina prepared in oxalic acid with varying time and temperature

Choudhari, KS and Kulkarni, Suresh D and Santhosh, C and George, Sajan D (2018) Photoluminescence enhancement and morphological properties of nanoporous anodic alumina prepared in oxalic acid with varying time and temperature. Microporous and Mesoporous Materials, 271. pp. 138-145. ISSN 1387-1811

[img] PDF
00005337.pdf - Published Version
Restricted to Registered users only

Download (3MB) | Request a copy

Abstract

We report on the photoluminescence (PL) enhancement and morphological properties of highly ordered Nanoporous anodic alumina (NAA) fabricated by two-step anodization for 2–10 h at 5 °C and 25 °C anodization temperatures. Structural features and pore arrangements of NAA were characterized. Pore-properties such as pore-diameter, porosity and growth rate showed an increase with rising in temperature whereas pore-wall thickness and barrier layer thickness decreased, however, interpore distance and pore density were not affected. Two-dimensional fast Fourier Transform (FFT) analysis was used to study the pore arrangement. The average pore regularity ratio was higher at 5 °C. The Photoluminescence (PL) spectra of NAA samples exhibited a strong visible blue emission at room temperature. The broad PL peak was deconvoluted into two Gaussian sub-bandsattributed to luminescent F+ and F centers. Experimental results showed that NAA prepared at elevated temperature showed PL enhancement by about 3.6–4.8 fold due to the increased anodizing current which leads to the increased density of F centers compared to F+ centers.

Item Type: Article
Uncontrolled Keywords: Anodization ; Nanopores ; Pore arrangement ; Fast fourier transform ; Photoluminescence.
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Library
Date Deposited: 15 Nov 2018 06:15
Last Modified: 15 Nov 2018 06:15
URI: http://eprints.manipal.edu/id/eprint/152304

Actions (login required)

View Item View Item