Preparation of photonic crystals made of air pores in anodic alumina

Wang, Biao; Fei, Guang Tao; Wang, Min; Kong, Ming; Zhang, Li De

doi:10.1088/0957-4484/18/36/365601

Cited by 139 publications

(99 citation statements)

References 23 publications

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“…The abrupt fall of current take place when the potential is applied which shows that the nucleation starts at the pores bottom. S. Valizadeh et al, described that the distinctly decrease in current take place owing to the mass transport limitation [37,38]. After that the current remains nearly unchanged till the complete filling of pores.…”

Section: Resultsmentioning

confidence: 99%

“…Preparation of the AAO template: The porous anodic alumina oxide (AAO) templates were prepared via a two-step anodization procedure [30,37,38]. Prior to anodizing, highpurity aluminum foils (99.999%) were first degreased in acetone and then were annealed in a vacuum of 10 −5 Torr at 500•C for 5 h to remove the mechanical stress, thus obtaining the aluminum foils with a homogeneous structure over a large area.…”

Section: Experimental Detailmentioning

confidence: 99%

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Metal Nanowires Subjected to Relavant Hydrated Metal Ions

Mukhtar¹,

Mehmood²

2017

IJMSA

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Abstract:The hcp-Co and fcc-Ni nanowires with the diameter of ~ 50nm were successfully prepared at different overpotentials by using potentiostatic electrochemical deposition in the pores of AAO templates. The prepared nanowires were characterized by X-ray diffraction, and the morphology of the nanowires was investigated by scanning electron microscope. In this study a new way is established to understand the growth rate of nanowires. The effect of work function on the growth rate of Co and Ni nanowires having same electrolyte's concentration, same pH value, and same overpotentials, has been discussed. The growth rate of metal nanowires in ECD is determined by the tunneling current between a metal and hydrated metal ions. The higher the tunneling current, the higher will be the growth rate. The tunneling current probably relates to the work function of metal. The larger is the value of work function the lower is the probability of electron tunneling. Lowering the work function causes increase in the current density. The hydrated Co and Ni ions are of octahedral structure with M-O distance of 2.08 Å and 2.05 Å, respectively. The work function of Co is smaller, this lead to higher tunneling current density. Therefore, the measured current density is higher for Co than for Ni and the Co nanowires grow faster than that of the Ni nanowires.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Detailmentioning

confidence: 99%

Metal Nanowires Subjected to Relavant Hydrated Metal Ions

Mukhtar¹,

Mehmood²

2017

IJMSA

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“…Instead, for interpore distances larger or in the order of light wavelength, the structure optical properties are modified in a more complex way giving, origin to light scattering effects. Finally, optical properties depend also on other geometrical parameters of PAA such as the degree of ordering of the pores [76] or the in-depth variation in the pore diameter [77,78]. Structures with pores ordered in an hexagonal array can be produced with the two-step anodization procedure introduced by Masuda and Fukuda [79].…”

Section: Biosensingmentioning

confidence: 99%

“…By adequately controlling the pore morphology in the depth of the PAA using variable anodiza-tion conditions pore diameter variations or controlled pore branching are obtained. Such structures constitute optical structures such as Fabry-Pérot (F-P) cavities [81] or distributed Bragg-reflectors (DBR) [77,78,82].…”

Section: Biosensingmentioning

confidence: 99%

Mesoporous alumina as a biomaterial for biomedical applications

Xifré-Pérez

Ferre-Borull

Pallarès

et al. 2015

Open Material Sciences

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Porous anodic alumina (PAA) is a biomaterial based on a cost-effective electrochemical anodization of pure aluminum with unique geometrical properties, i.e., self-ordering hexagonal pore distribution, tunable pore diameters and interpore distances, and uniformity of the pores in the vertical direction (nanochannels). These remarkable properties have found important applications in several fields such as energy storage, optics, photonics, magnetism, catalysis and, in particular, in the biomedicine field. In this work, we review the current state of research and key issues on cell culture and implants, drug delivery systems with complex release profiles and specific action, and high efficiency and sensitivity biosensors with different biosensing mechanisms, all of them based on PAA. The biocompatibility, morphology of the surface, nanoestructural engineering in-depth, surface functionalization and coatings are discussed and analyzed in detail.

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“…[4][5][6][7][8][9] Recently, the new technique has been developed for production of mesoporous one-dimensional (1D) photonic crystals by means of electrochemical etching of aluminum. [10][11][12] The lattice constant of obtained mesoporous 1D alumina photonic crystals depends on the etching regime and may vary in the range of 100-500 nm.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of mesoporous photonic crystals, filled with dielectrics, ferroelectrics and piezoelectrics

Горелик

Fei

2017

J. Adv. Dielect.

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At present, it is very important to create new types of mirrors, nonlinear light frequency transformers and optical filters with controlled optical properties. In this connection, it is of great interest to study photonic crystals. Their dielectric permittivity varies periodically in space with a period permitting Bragg diffraction of light. In this paper, we have investigated the optical properties of mesoporous three-dimensional (3D) opal-type and one-dimensional (1D) anodic alumina photonic crystals, filled with different dielectrics, ferroelectrics and piezoelectrics. We have compared the optical properties of initial mesoporous photonic crystals and filled with different substances. The possibility of mesoporous photonic crystals using selective narrow-band light filters in Raman scattering experiments and nonlinear mirrors has been analyzed. The electromagnetic field enhancing in the case of exciting light frequency close to the stop band edges has been established. The optical harmonics and subharmonics generation in mesoporous crystals, filled with ferroelectrics and piezoelectrics was proposed.

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Preparation of photonic crystals made of air pores in anodic alumina

Cited by 139 publications

References 23 publications

Metal Nanowires Subjected to Relavant Hydrated Metal Ions

Metal Nanowires Subjected to Relavant Hydrated Metal Ions

Mesoporous alumina as a biomaterial for biomedical applications

Optical properties of mesoporous photonic crystals, filled with dielectrics, ferroelectrics and piezoelectrics

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