scholarly journals Ultra-High Density Single Nanometer-Scale Anodic Alumina Nanofibers Fabricated by Pyrophosphoric Acid Anodizing

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Tatsuya Kikuchi ◽  
Osamu Nishinaga ◽  
Daiki Nakajima ◽  
Jun Kawashima ◽  
Shungo Natsui ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
High Density ◽  
Nanometer Scale ◽  
Alumina Nanofibers ◽  
Pyrophosphoric Acid

Direct sub-nanometer scale electron microscopy analysis of anion incorporation to self-ordered anodic alumina layers

2010 ◽  
Vol 52 (11) ◽  
pp. 3763-3773 ◽  
Author(s):  
L. González-Rovira ◽  
M. López-Haro ◽  
A.B. Hungría ◽  
K. El Amrani ◽  
J.M. Sánchez-Amaya ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Anodic Alumina ◽  
Nanometer Scale ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis

scholarly journals Highly Ordered Anodic Alumina Nanofibers Fabricated via Two Distinct Anodizing Processes

2015 ◽  
Vol 4 (5) ◽  
pp. H14-H17 ◽  
Author(s):  
D. Nakajima ◽  
T. Kikuchi ◽  
S. Natsui ◽  
R. O. Suzuki
Keyword(s):  
Anodic Alumina ◽  
Alumina Nanofibers

Nanometer-Scale SOI Based Y-Branch Couplers for High Density Optical Integrated Circuits

2013 ◽  
Vol 562-565 ◽  
pp. 996-1000
Author(s):  
Zhen Zhou ◽  
Zheng Fang Dong ◽  
Li Shuang Feng ◽  
Kun Bo Wang ◽  
Yin Zhou Zhi
Keyword(s):  
Integrated Circuits ◽  
Inductively Coupled Plasma ◽  
Beam Propagation Method ◽  
High Density ◽  
Propagation Loss ◽  
Nanometer Scale ◽  
Optical Integrated Circuits ◽  
Inductively Coupled ◽  
Branch Angle ◽  
Strong Confinement

SOI Ridge nanowire waveguide (RNW) has advantages of strong confinement of optical mode, low propagation loss, small bend radius and fully compatible with CMOS technique, etc. An ultra-compact Y-branch coupler based on SOI RNW was designed and fabricated. Based on the finite-difference beam propagation method (FD-BPM), key parameters of the coupler were analyzed. Then the device was fabricated by electron beam lithography (EBL) and inductively coupled plasma (ICP) reactive ion etching. Results showed that the propagation loss of RNW was 1.89 dB/mm, and the radiation loss of the coupler with branch angle of 30° was only 0.66 dB. Compared with traditional Y-branch coupler, the proposed structure were more promising for high density optical integrated circuits.

The Study on Surface Chemistry of Nanoporous Black Si Layers

2011 ◽  
Vol 79 ◽  
pp. 304-308
Author(s):  
Wang Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Surface Chemistry ◽  
Point Defects ◽  
High Density ◽  
Nanometer Scale ◽  
Transmission Electron ◽  
One Step ◽  
Amorphous Si ◽  
Microscopy Techniques

We reported our detailed investigation of the microstructure and surface chemistry of nanoporous black Si layers using transmission electron microscopy techniques such as HRTEM, EDS, and EELS. We found that a one-step nanoparticle-catalyzed liquid etch creates deep conical nanovoids. The cones provide the density-graded surface that suppresses reflection. The surface of the as-etched nanoporous black Si is an amorphous Si suboxide (SiOx) produced by the strongly oxidizing nanocatalyzed etch. The c-Si/suboxide interface is rough at the nanometer scale and contains a high density of point defects.

scholarly journals Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2271
Author(s):  
Mikhail Pashchanka
Keyword(s):  
Film Growth ◽  
Theoretical Models ◽  
Anodic Alumina ◽  
Transport Processes ◽  
Self Organization ◽  
Anodized Aluminum ◽  
Hierarchical Pores ◽  
Alumina Nanofibers ◽  
Current Voltage ◽  
Experimental Findings

Over the past few years, researchers have made numerous breakthroughs in the field of aluminum anodizing and faced the problem of the lack of adequate theoretical models for the interpretation of some new experimental findings. For instance, spontaneously formed anodic alumina nanofibers and petal-like patterns, flower-like structures observed under AC anodizing conditions, and hierarchical pores whose diameters range from several nanometers to sub-millimeters could be explained neither by the classical field-assisted dissolution theory nor by the plastic flow model. In addition, difficulties arose in explaining the basic indicators of porous film growth, such as the nonlinear current–voltage characteristics of electrochemical cells or the evolution of hexagonal pore patterns at the early stages of anodizing experiments. Such a conceptual crisis resulted in new multidisciplinary investigations and the development of novel theoretical models, whose evolution is discussed at length in this review work. The particular focus of this paper is on the recently developed electroconvection-based theories that allowed making truly remarkable advances in understanding the porous anodic alumina formation process in the last 15 years. Some explanation of the synergy between electrode reactions and transport processes leading to self-organization is provided. Finally, future prospects for the synthesis of novel anodic architectures are discussed.

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