Modification of alumina matrices through chemical etching and electroless deposition of nano-Au array for amperometric sensing

Jagminas, Arūnas; Kuzmarskytė, Julijana; Valinčius, Gintaras; Malferrari, L.; Malinauskas, Albertas

doi:10.1007/s11671-007-9043-y

Cited by 5 publications

(2 citation statements)

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“…1 High reproducibility of the oxide parameters (pore diameter, cell one and pore density) are provided by self-organizing growth of the nanopore films that can be achieved by an anodizing voltage control. 2 Now porous alumina films are used for formation of metal nanowires, [3][4][5] arrays of carbon nanowires, 6,7 porous membranes, 8 and nanostructure magnetic materials. 9 As a result of anion incorporation into the oxide structure during anodizing of aluminum, properties of porous alumina films depend on the nature of the anodizing electrolyte.…”

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confidence: 99%

Re-Anodizing Technique as a Method of Investigation of Thermally Activated Defects in Anodic Alumina Films

Vrublevsky

Jagminas

Chernyakova

2013

J. Electrochem. Soc.

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A new approach of determination of energy of shallow thermally activated traps in the anodic alumina films is suggested. The approach consists of the heat-treatment of the anodic Al 2 O 3 |Al structure at 100-350 • C (this means thermal release of electrons from the traps) and then re-anodizing of the anodic films in the barrier type electrolytes in potentiodynamic mode (refilling of electron traps during transient processes). In comparison with existing methods (thermoactivated and surface soft-X-ray absorption and photoemission spectroscopy), this method is relatively simple and can be applied to investigate electron trap levels both in semiconductor and insulator films. The algorithm of data-processing of experimental results was also proposed to obtain the parameters of thermally activated electron traps. It was applied to calculate the activation energy of electron traps that is equal to 0.147 and 0.060 eV for sulfuric and oxalic acid alumina films, respectively. The concentration of the traps was determined to be on the order of 10 19 cm −3 . The electron traps are believed to be due to the presence of coordinatively unsaturated aluminum ions, their presence was confirmed by FTIR spectroscopy. On the basis of data obtained a model is suggested for the transitions that take place in the barrier layer of the anodic alumina during heating and re-anodizing.A great number of adsorbents and catalysts are amorphous oxides. Therefore, it is important to investigate local energy states in the bandgap of the amorphous semiconductors and insulators.As is known, the films of amorphous anodic alumina with high ordered cell-porous structure is formed on the surface of aluminum when anodizing takes place in aqueous solutions of sulphuric, oxalic, phosphoric acids, and etc. 1 High reproducibility of the oxide parameters (pore diameter, cell one and pore density) are provided by self-organizing growth of the nanopore films that can be achieved by an anodizing voltage control. 2 Now porous alumina films are used for formation of metal nanowires, 3-5 arrays of carbon nanowires, 6,7 porous membranes, 8 and nanostructure magnetic materials. 9 As a result of anion incorporation into the oxide structure during anodizing of aluminum, properties of porous alumina films depend on the nature of the anodizing electrolyte. According to Lambert et al. 10 anion incorporation could be a reason for the induction of mechanical stress in the anodic oxide, which results in the origin of point defects such as electron traps. Other authors believe that the electron traps result from the defects caused by disturbance of coordination environment of aluminum ions due to acid anion incorporation or products of their oxidation in the anodic alumina. 11 In the anodic alumina layers under high strength electric field photoand electroluminescence, 12 electrical breakdown, 13,14 and switching effects in MIM-structures (metal-insulator-metal) 15 are due to the processes of capture and transfer of electrons in the electron traps. UV radiation and magnetic...

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confidence: 99%

Re-Anodizing Technique as a Method of Investigation of Thermally Activated Defects in Anodic Alumina Films

Vrublevsky

Jagminas

Chernyakova

2013

J. Electrochem. Soc.

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“…This method permits to tune surface properties such as delta potential or electric charge, [59] pore geometry, [60] pore contents such as drugs [61,62] or nanoparticles. [63] Other functionalization routes have also been applied such as electrochemical, [35,36,[64][65][66][67] gas-phase with thermal vapor deposition, [57,58,68,69] atomic layer deposition (ALD), [70,71] or chemical vapor deposition (CVD). [72][73][74][75] Immunosensors are high-affinity devices based on the specific and strong interaction between an immobilized antibody and an antigen (analyte).…”

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confidence: 99%

Oligonucleotic Probes and Immunosensors Based on Nanoporous Anodic Alumina for Screening of Diseases

Xifré-Pérez

Ferré‐Borrull

Marsal

2022

Adv Materials Technologies

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This paper is an overview of the recent advances in nanoporous anodic alumina sensing platforms based on the interaction of oligonucleotides and antibodies with bioelements (e.g., virus, bacteria, or biomarkers) that can cause or identify diseases. Nanoporous alumina is the common platform material for all these sensing devices that have an enormous potential for the next‐generation bioanalytical systems. Nanoporous alumina is a cost‐effective material with morphological flexibility that provides high sensitivity to the sensing systems due to its large surface‐to‐volume ratio. Immunosensors transduce the signal produced by the specific antibody–antigen interaction. They are widely used for clinical analysis due to the high selectivity and sensitivity of their immunoreaction, transduced by different methods (electrochemical, optical, piezoelectric, etc). Another important, outstanding and more recently type of biosensors are based on the oligonucleotic functionalization of nanoporous alumina. Oligonucleotides can bind to a wide variety of elements (small organic molecules, proteins, or cells) with high selectivity, specificity, and affinity, even higher to those of antibodies. The basic concepts and mechanisms of their sensing methods for health care biosensing are introduced. Their transduction methods and great potential applications will be evaluated and classified in detail, together with a discussion of possible future trends.

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Nanoporous anodic aluminium oxide: Advances in surface engineering and emerging applications

Jani

Lošić

Voelcker

2013

Progress in Materials Science

484

316

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Modification of alumina matrices through chemical etching and electroless deposition of nano-Au array for amperometric sensing

Cited by 5 publications

References 28 publications

Re-Anodizing Technique as a Method of Investigation of Thermally Activated Defects in Anodic Alumina Films

Re-Anodizing Technique as a Method of Investigation of Thermally Activated Defects in Anodic Alumina Films

Oligonucleotic Probes and Immunosensors Based on Nanoporous Anodic Alumina for Screening of Diseases

Nanoporous anodic aluminium oxide: Advances in surface engineering and emerging applications

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