Unveiling the Hard Anodization Regime of Aluminum: Insight into Nanopores Self-Organization and Growth Mechanism

Vega V, Garcia J, Montero-Moreno JM, Hernando B, Bachmann J, Prida VM, Nielsch K (2015)

Publication Status: Published

Publication Type: Journal article

Publication year: 2015

Journal

ACS Applied Materials and Interfaces American Chemical Society

Publisher: American Chemical Society

Book Volume: 7

Pages Range: 28682-28692

Journal Issue: 51

DOI: 10.1021/acsami.5b10712

Abstract

Pores growth mechanism and their self-ordering conditions are investigated for nanoporous alumina membranes synthesized by hard anodization (HA) of Al in a broad range of anodic conditions, covering oxalic acid electrolytes with concentrations from 0.300 M down to 0.075 M and potentiostatic anodization voltages between 120 and 225 V. The use of linear sweep voltammetry (LSV) and scanning and transmission electron microscopy, together with image analysis techniques allow one to characterize the intrinsic nature of the HA regime. HA of aluminum is explained on the basis of a phenomenological model taking into account the role of oxalate ions and their limited diffusion through alumina nanochannels from a bulk electrolyte. The depletion of oxalate ions at the bottom of the pores causes an increased growth of the alumina barrier layer at the oxide/electrolyte interface. Furthermore, an innovative method has been developed for the determination of the HA conditions leading to self-ordered pore growth in any given electrolyte, thus allowing one to extend the available range of interpore distances of the highly ordered hexagonal pore arrangement in a wide range of 240-507 nm, while keeping small pore diameters of 50-60 nm.

Authors with CRIS profile

Julien Bachmann Lehrstuhl für Chemistry of thin film materials

Involved external institutions

Universität Hamburg (UHH) DE Germany (DE) Universidad de Oviedo ES Spain (ES)

How to cite

APA:

Vega, V., Garcia, J., Montero-Moreno, J.M., Hernando, B., Bachmann, J., Prida, V.M., & Nielsch, K. (2015). Unveiling the Hard Anodization Regime of Aluminum: Insight into Nanopores Self-Organization and Growth Mechanism. ACS Applied Materials and Interfaces, 7(51), 28682-28692. https://dx.doi.org/10.1021/acsami.5b10712

MLA:

Vega, Victor, et al. "Unveiling the Hard Anodization Regime of Aluminum: Insight into Nanopores Self-Organization and Growth Mechanism." ACS Applied Materials and Interfaces 7.51 (2015): 28682-28692.

BibTeX: Download