Synthesis of TiO2-Based Nanotube on Ti Substrate by Hydrothermal Treatment

2007 ◽  
Vol 7 (2) ◽  
pp. 668-672 ◽  
Author(s):  
Bo Chi ◽  
Erick S. Victorio ◽  
Tetsuro Jin
Keyword(s):  
Aspect Ratio ◽  
Pore Size ◽  
Hydrothermal Treatment ◽  
Formation Mechanism ◽  
High Aspect Ratio ◽  
Hydrothermal Conditions ◽  
Titanate Nanotube ◽  
Naoh Solution ◽  
Nanofiber Film

TiO2-based titanate nanotube film was directly synthesized by hydrothermal treatment of Ti substrate in NaOH solution. The prepared high aspect ratio nanotubes have diameter of 10nm and pore size of 5 nm with length of several microns. The nanotubes show the same structure and component characteristics as the nanotubes prepared through hydrothermal treatment of TiO2. Other nanostructured titanate as oriented nanofiber film and translucent film were also prepared by adjusting the hydrothermal conditions. The formation mechanism of nanostructured titanate was discussed.

Formation of GaN Self-Organized Nanotips by Nanomasking Effect

2001 ◽  
Vol 707 ◽  
Author(s):  
Harumasa Yoshida ◽  
Tatsuhiro Urushido ◽  
Hideto Miyake ◽  
Kazumasa Hiramtsu
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Aspect Ratio ◽  
Formation Mechanism ◽  
High Aspect Ratio ◽  
Photoelectron Spectroscopy ◽  
Nanometer Scale ◽  
Xps Analysis ◽  
X Ray ◽  
Self Organized

ABSTRACTWe have successfully fabricated self-organized GaN nanotips by reactive ion etching using chlorine plasma, and have revealed the formation mechanism. Nanotips with a high density and a high aspect ratio have been formed after the etching. We deduce from X-ray photoelectron spectroscopy (XPS) analysis that the nanotip formation is attributed to nanometer-scale masks of SiO2 on GaN. The structures calculated by Monte Carlo simulation of our formation mechanism are very similar to the experimental nanotip structures.

Formation of GaN Self-Organized Nanotips by Nanomasking Effect

2001 ◽  
Vol 693 ◽  
Author(s):  
Harumasa Yoshida ◽  
Tatsuhiro Urushido ◽  
Hideto Miyake ◽  
Kazumasa Hiramtsu
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Aspect Ratio ◽  
Formation Mechanism ◽  
High Aspect Ratio ◽  
Photoelectron Spectroscopy ◽  
Nanometer Scale ◽  
Xps Analysis ◽  
X Ray ◽  
Self Organized

AbstractWe have successfully fabricated self-organized GaN nanotips by reactive ion etching using chlorine plasma, and have revealed the formation mechanism. Nanotips with a high density and a high aspect ratio have been formed after the etching. We deduce from X-ray photoelectron spectroscopy (XPS) analysis that the nanotip formation is attributed to nanometer-scale masks of SiO2 on GaN. The structures calculated by Monte Carlo simulation of our formation mechanism are very similar to the experimental nanotip structures.

Development of CdS nanorods of high aspect ratio under hydrothermal conditions with PEG template

2011 ◽  
Vol 316 (1) ◽  
pp. 126-131 ◽  
Author(s):  
N.S. Nirmala Jothi ◽  
P. Dennis Christy ◽  
A.R. Baby Suganthi ◽  
G. Ramalingam ◽  
P. Sagayaraj
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Hydrothermal Conditions ◽  
Cds Nanorods

Formation mechanism of sidewall striation in high-aspect-ratio hole etching

2019 ◽  
Vol 58 (SE) ◽  
pp. SEEB02 ◽  
Author(s):  
Mitsuhiro Omura ◽  
Junichi Hashimoto ◽  
Takahiro Adachi ◽  
Yusuke Kondo ◽  
Masao Ishikawa ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Formation Mechanism ◽  
High Aspect Ratio

Generation of Silicon Nanocolumns by Nanosecond Pulsed-Excimer Laser Irradiation and Their Field Emission Properties

2002 ◽  
Vol 737 ◽  
Author(s):  
Yingfeng Guan ◽  
A. J. Pedraza ◽  
E. D. Ellis ◽  
L. R. Baylor
Keyword(s):  
Aspect Ratio ◽  
Laser Irradiation ◽  
Field Emission ◽  
Formation Mechanism ◽  
High Aspect Ratio ◽  
Flat Surface ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Excimer Laser Irradiation ◽  
Tip Radius

ABSTRACTLaser-generated silicon microcone arrays were used as templates for the growth of nanocolumns using laser irradiation as well. The formation mechanism of the microstructure is briefly reviewed, and the origin and growth of nanocolumns are discussed. The formation mechanism of nanocolumns requires highly localized melting, which explains why they fail to form on a flat surface but can grow atop the microcones. Field emission properties from both microcolumns and nanocolumns have been measured. The high aspect ratio (height/tip radius) of nanocolumns makes them suitable for various field emission applications.

Study on the Burr Formation Process in Micro Milling of High Aspect Ratio Structures

2021 ◽  
Author(s):  
Xinlei Zhang ◽  
Ni Chen ◽  
Jinming Wu ◽  
Jiawei Wei ◽  
Bo Yan ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Formation Mechanism ◽  
High Aspect Ratio ◽  
Formation Process ◽  
Element Model ◽  
Micro Milling ◽  
Burr Formation ◽  
Machining Accuracy ◽  
Machined Surface ◽  
Micro Structures

Abstract High-aspect-ratio (HAR) micro-structures of harden steel (SKD11) are widely used in the national defense and electronic fields. Micro-milling is a suitable method for machining HAR micro structures, however the inevitable generation of burrs deteriorates the machined surface. Previous studies have mostly focused on the burr formation process of shallow grooves, but have ignored HAR grooves. This paper investigated the burr formation mechanism in HAR (2:1) grooves on harden steel (SKD11). Due to the fact that the burr formation process was difficult to be observed in the actual micro-milling process, a finite element model was established. A corresponding experimental research was conducted, which revealed a good consistency between simulation and experimental results. Moreover, a new burr type was formed on the sidewall of the HAR groove, which was transformed from top burrs and was named as side burr. The results demonstrated that the chip flow on the rake face of the micro-mill was hindered by the sidewall, which caused chip crumbling, chip accumulation, and surface scraping, seriously affecting the burr formation mechanism. This paper revealed the burr formation mechanism for HAR grooves, and provided research direction for improving the machining accuracy of HAR grooves.

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