ИСТИНА

Porous anodic aluminum oxide (PAAO) is an ensemble of vertically oriented nanotubes, so it can be used as membrane filters, matrices for creating various nanocomposites, as templates for creating nanostructures of various chemical compositions. It is important to obtain PAOA with low photoluminescence (PL) intensity by varying the synthesis conditions. Thus, the aluminum oxide matrix itself will not contribute to the processes of radiative recombination of photoexcited charge carriers, that is, the luminescence will be exclusively due to the luminescence of the test analyte in pores. The PAOA samples were formed by the electrochemical method in electrolytes based on different acids - sulfuric and selenium and at different synthesis parameters. The samples were divided into 2 parts: the original and with the applied analyte - rhodamine dye. It was found that all PAOA films have an amorphous structure. The samples formed in the electrolyte based on selenic acid have the required properties: the original films do not luminesce, PAOA with the dye are characterized by intense rhodamine PL. It was found that the main type of defects in the PAOA structures synthesized in sulfuric acid are oxygen vacancies responsible for radiative recombination processes. In PAOA films obtained in selenic acid, oxygen vacancies in low concentrations and oxygen radicals (non-radiative centers) in high concentrations were registered.