Nanocomposites and nanomaterials

Role of graphene oxide for fabrication of porous anodic alumina oxide
Rozhdestvenska L.M., Kudelko K.O., Palchik O.V., Ogenko V.M.,   Chmilenko V.V.
V.I. Vernadskii Institute of General and Inorganic Chemistry of the NAS of Ukraine, 32/34 Palladin ave., 03142, Kyiv, Ukraine
E-mail:  vali4ka.v.ch1998@gmail.com

Nanoporous anodic alumina oxide (AAO) have shown their potential in numerous engineering application for microelectronics, sensitive optical devices, as sensors for analytical determinations, as porous templates for formation of nanostructures, as perspective membranes for hemodialysis. The main advantages of regular pore structure of AAO is biocompatible, bioinert and chemically stable ceramic material. 
The process of anodization of aluminum foil in 0.3 M oxilic acid was studied. The effect of Graphene oxide particles containing in acid electrolyte on formation of porous anodic aluminum oxide geometry was investigated. As a starting material for anodizing aluminum foil with impurities was used: Fe ⩾ 0.01%, Si ⩽0.01%, Mg ⩽ 0.01%, Cu – traces, with a thickness of 0,3 mm, size of 45 mm × 45 mm. In experimental condition where nanoparticles of Graphene oxides are being incorporated into the anodic alumina walls that have been determined by SEM spectroscopy. It was found correlation between the amount of Graphene oxide in circulating electrolyte and obtained pore structure of AAO layer. Scanning electron microscopy showed that the AOA sample has a characteristic honeycomb structure, in particular combs with a smaller size comparing with AOA samples obtained without GO suspension. The inner pore diameter is in the range of 17-36 nm. The width of the inner wall is 22 nm. The thickness of AOA layer was measured and correlated with theoretical - 51 μm. The obtained morphological data demonstrates the possibility to control the pore diameter, interpore distance during anodizing process with addition mass.% Graphene oxide in electrolyte. Varying GO amount allows preparing AAO films with smaller pores without changing the voltage. The possibility to obtain flexible ceramic membrane using low cost aluminum foil could be resumed. Nanoporous AAO membrane in future could be used for separation of biological solutions.