Electrochemical synthesis and magnetoresistance properties of Ni, Co and Co/Cu nanowires in a nanoporous anodic oxide layer on metallic aluminium

Ohgai, Takeshi; Hoffer, X.; Fabian, A. C.; Gravier, L.; Ansermet, Jean-Philippe

doi:10.1039/b306581b

Cited by 59 publications

(41 citation statements)

References 22 publications

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“…Most reports on the anodizing of aluminum use high-purity aluminum for improving the quality of porous alumina membranes. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] However, few studies have been conducted on the anodization of low-purity aluminum. [21][22][23][24][25][26][27][28][29] Fabrication of anodic alumina membranes from low-purity aluminum foil is not trivial and often requires specific conditions, different from those typically applied to the anodization of high-purity aluminum.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aluminum Purity on the Pore Formation of Porous Anodic Alumina

Kim¹,

Lee

2014

Bulletin of the Korean Chemical Society

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Anodic alumina oxide (AAO), a self-ordered hexagonal array, has various applications in nanofabrication such as the fabrication of nanotemplates and other nanostructures. In order to obtain highly ordered porous alumina membranes, a two-step anodization or prepatterning of aluminum are mainly conducted with straight electric field. Electric field is the main driving force for pore growth during anodization. However, impurities in aluminum can disturb the direction of the electric field. To confirm this, we anodized two different aluminum foil samples with high purity (99.999%) and relatively low purity (99.8%), and compared the differences in the surface morphologies of the respective aluminum oxide membranes produced in different electric fields. Branched pores observed in porous alumina surface which was anodized in low-purity aluminum and the size; dimensions of the pores were found to be usually smaller than those obtained from high-purity aluminum. Moreover, anodization at high voltage proceeds to a significant level of conversion because of the high speed of the directional electric field. Consequently, anodic alumina membrane of a specific morphology, i.e., meshed pore, was produced.

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Section: Introductionmentioning

confidence: 99%

Effect of Aluminum Purity on the Pore Formation of Porous Anodic Alumina

Kim¹,

Lee

2014

Bulletin of the Korean Chemical Society

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“…To gain new properties of materials related to their nanometric size in at least one dimension, nanowires [2][3][4][5][6][7][8][9][10][11], nanotubes [12,13] and nanodots [14,15] made of various materials like metals and alloys [2-5, 14, 15], semiconductors [6,7], superconductors [8] and polymers [10][11][12][13] were obtained using various techniques, including electrochemical deposition [2][3][4][5][10][11][12], sol-gel technique [6,8], atomic layer deposition [14,15], and chemical vapor deposition [9]. Recently, fabrication of many devices based on anodic aluminum oxide (AAO) has been also reported [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of nanopore arrangement and structural features of anodic alumina layers formed by two-step anodizing in oxalic acid using the dedicated executable software

et al. 2013

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Anodic porous alumina layers were fabricated by a two-step self-organized anodization in 0.3 M oxalic acid under various anodizing potentials ranging from 30 to 60 V at two different temperatures (10 and 17 • C). The effect of anodizing conditions on structural features and pore arrangement of AAO was investigated in detail by using the dedicated executable publication combined with ImageJ software. With increasing anodizing potential, a linear increase of the average pore diameter, interpore distance, wall thickness and barrier layer thickness, as well as a decrease of the pore density, were observed. In addition, the higher pore diameter and porosity values were obtained for samples anodized at the elevated temperature, independently of the anodizing potential. A degree of pore order was investigated on the basis of Delaunay triangulations (defect maps) and calculation of pair distribution or angle distribution functions (PDF or ADF), respectively. All methods confirmed that in order to obtain nanoporous alumina with the best, hexagonal pore arrangement, the potential of 40 V should be applied during anodization. It was confirmed that the dedicated executable publication can be used to a fast and complex

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“…Template synthesis technique such as fabricating nano-pores and electrodepositing nanowires requires precise techniques controlling position of each nano-pore, inter-pore distance, pore diameter and pore shape [18][19][20]. Lithographic galvanoforming process using laser, electrons and ions beam could satisfied the above requirements to synthesize new nano-electronic devices.…”

Section: Methodsmentioning

confidence: 99%