Abstract
We report on an exhaustive and systematic study about the photoluminescent properties of nanoporous anodic alumina membranes fabricated by the one-step anodization process under hard conditions in oxalic and malonic acids. This optical property is analysed as a function of several parameters (i.e. hard anodization voltage, pore diameter, membrane thickness, annealing temperature and acid electrolyte). This analysis makes it possible to tune the photoluminescent behaviour at will simply by modifying the structural characteristics of these membranes. This structural tuning ability is of special interest in such fields as optoelectronics, in which an accurate design of the basic nanostructures (e.g. microcavities, resonators, filters, supports, etc.) yields the control over their optical properties and, thus, upon the performance of the nanodevices derived from them (biosensors, interferometers, selective filters, etc.)
Highlights
Some applied sciences such as telecommunications, photocatalysis, photovoltaics, optoelectronics and biotechnology have registered a noticeable development throughout the last decades
It is observed that the PL spectra of those nanoporous anodic alumina membranes (NAAMs) are rather wide and asymmetric, which denotes the presence of several luminescent centres (i.e. F+ and F)
For longer etching times (i.e. 15 min), the PL peak intensity decreases sharply. This means that the middle layer of the pore walls is partially dissolved during this etching time. This result certifies that the outer layer is thinner than that of NAAMs produced in oxalic acid (i.e. Table 1 tPW = 15 min ! dp = 116 ± 7 nm)
Summary
Some applied sciences such as telecommunications, photocatalysis, photovoltaics, optoelectronics and biotechnology have registered a noticeable development throughout the last decades. One of the main reasons of that development is the better understanding over the optical properties of certain materials, among which nanoporous anodic alumina (NAA) is an outstanding example. Since the first study about the PL properties of NAA [1], many efforts have been made in order to understand the PL behaviour of this material [2,3,4,5,6,7,8,9,10,11,12,13,14,15]. NAA is a material commonly used in nanotechnology as a template or support for its versatility [16,17,18,19,20,21,22]. NAA is composed of biosensors, interferometers, supports and so forth [31,32,33,34,35]
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