scholarly journals Laser Fabrication of Nanoholes on Silica through Surface Window Assisted Nano-Drilling (SWAN)

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3340
Author(s):  
Yu Lu ◽  
Lin Kai ◽  
Qing Yang ◽  
Guangqing Du ◽  
Xun Hou ◽  
...  
Keyword(s):  
Silica Surface ◽  
Bessel Beam ◽  
Subwavelength Structure ◽  
Effective Surface ◽  
Laser Fabrication ◽  
Nanoscale Structures ◽  
Nano Structures ◽  
Silica Material ◽  
Hard And Brittle Materials ◽  
20 Nm

Nano-structures have significant applications in many fields such as chip fabrications, nanorobotics, and solar cells. However, realizing nanoscale structures on hard and brittle materials is still challenging. In this paper, when processing the silica surface with a tightly focused Bessel beam, the smallest nanohole with ~20 nm diameter has been realized by precisely controlling the interior and superficial interaction of the silica material. An effective surface window assisted nano-drilling (SWAN) mechanism is proposed to explain the generation of such a deep subwavelength structure, which is supported by the simulation results of energy depositions.

scholarly journals (Ti,Al)O2 Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2658
Author(s):  
Krzysztof Szymkiewicz ◽  
Jerzy Morgiel ◽  
Łukasz Maj ◽  
Małgorzata Pomorska
Keyword(s):  
Surface Hardening ◽  
Surface Defects ◽  
Plasma Nitriding ◽  
Surface Roughening ◽  
Effective Surface ◽  
Plan View ◽  
Gas Nitriding ◽  
Transmission Electron ◽  
Temperature Window ◽  
20 Nm

Plasma nitriding of titanium alloys is capable of effective surface hardening at temperatures significantly lower than gas nitriding, but at a cost of much stronger surface roughening. Especially interesting are treatments performed at the lower end of the temperature window used in such cases, as they are least damaging to highly polished parts. Therefore identifying the most characteristic defects is of high importance. The present work was aimed at identifying the nature of pin-point bumps formed at the glow discharged plasma nitrided Ti-6Al-7Nb alloy using plan-view scanning and cross-section transmission electron microscopy methods. It helped to establish that these main surface defects developed at the treated surface are (Ti,Al)O2 nano-whiskers of diameter from 20 nm to 40 nm, and length up to several hundreds of nanometers. The performed investigation confirmed that the surface imperfection introduced by plasma nitriding at the specified range should be of minor consequences to the mechanical properties of the treated material.

Fabrication of Nano-Electromechanical Structures Down to 20 nm by Spacer Technology

2007 ◽  
Author(s):  
Xiang Han ◽  
Ling Xia ◽  
Wengang Wu ◽  
Guizhen Yan ◽  
Jun Xu ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Mechanical Vibration ◽  
Cantilever Beams ◽  
Fabrication Method ◽  
Feature Size ◽  
Plasma Damage ◽  
Nano Fabrication ◽  
Nano Structures ◽  
20 Nm ◽  
Deposited Film

Spacer technology has been developed to fabricate nano-structures for NEMS application. It provides a parallel nano-fabrication method with double or quadplex device density at a certain lithography node. By controlling the deposited film thickness, the feature size of the SiO2 spacer hard mask is reduced down to 35 nm. After the spacer pattern is transferred to Si, a precise thermal oxidation is performed to improve the profile and reduce the plasma damage. Finally, sublimation or HF vapor phase etching is introduced to release the nano-structures according to different structure dimensions. As a result, with better surface morphology, suspended Si nano-beams with a width of 20 nm are obtained. Actuated by mechanical vibration and electrostatic forces, vibrations of the obtained cantilever beams and fixed-fixed beams are observed in SEM. In addition, a metallic nano-nozzle with a diameter of 140 nm is established by electroless plating around the suspended Si nano-beam served as a mold. As a development of the spacer technology, nano-needle array is demonstrated at the cross points of crossed SiO2 spacers by anisotropic etching. The diameters of the hybridized nano-needles are 300 nm so far and can be further reduced by smaller spacer dimension.

GaN Three Dimensional Nanostructures

1995 ◽  
Vol 395 ◽  
Author(s):  
V. Dmitriev ◽  
K. Irvine ◽  
A. Zubrilov ◽  
D. Tsvetkov ◽  
V. Nikolaev ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Blue Shift ◽  
High Energy ◽  
Peak Position ◽  
Organic Chemical ◽  
Nanoscale Structures ◽  
Dot Density ◽  
20 Nm

ABSTRACTWe report on the growth and characterization of three dimensional nanoscale structures of GaN. GaN dots were grown by metal organic chemical vapor deposition (MOCVD) on 6H-SiC substrates. The actual size of the dots measured by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) ranged from ∼20 nm to more than 2 μm. The average dot density ranged from 107 to 109 cm−2. The single crystal structure of the dots was verified by reflectance high energy electron diffraction (HEED) and TEM. Cathodoluminescence (CL) and photoluminescence (PL) of the dots were studied at various temperatures and excitation levels. The PL and CL edge peak for the GaN dots exhibited a blue shift as compared with edge peak position for continuous GaN layers grown on SiC.

MÖSSBAUER STUDY OF STRUCTURAL–CHEMICAL TRANSFORMATION IN TWO-DIMENSIONAL IRON–OXYGEN NANOSTRUCTURES IN THE COURSE OF TRANSPORT REDUCTION

2000 ◽  
Vol 07 (01n02) ◽  
pp. 1-6
Author(s):  
V. M. SMIRNOV ◽  
G. P. VORONKOV ◽  
V. G. SEMENOV ◽  
V. G. POVAROV ◽  
I. V. MURIN
Keyword(s):  
Silica Surface ◽  
Covalent Bonding ◽  
Iron Silicate ◽  
Chemical Transformations ◽  
Two Dimensional ◽  
Mössbauer Study ◽  
Nanoscale Structures ◽  
Reduction Of Iron ◽  
Oxygen Groups ◽  
Surface Monolayers

Structural–chemical transformations of quasi-two-dimensional iron–oxygen nanostructures occurring at transport reduction were studied using NGR spectroscopy. It has been found that isolated iron–oxygen groups [i.e. groups containing iron and oxygen atoms: ≡Si–O–Fe(OH)2 and (≡Si–O–)2–FeOH] forming surface monolayers were not reduced at T = 400–600° C because of their covalent bonding with the silica surface. Reduction of iron oxide microparticles (microstructures) at T ≥ 600°C C resulted in the formation of metal iron in the form of α-Fe. It has been revealed that in the course of transport reduction (TR) of the samples with deposited monolayers (one or four monolayers) at T ≥ 600° C bulk phases of iron silicate and metal iron were formed. It has also been shown that the features of structural–chemical transformations of supported iron–oxygen nanolayers were in relation with the specific character of phase formation within nanoscale structures.

Study on Ultrafast Laser Fabrication of UV-FIR Ultra-broad-band Antireflection Surface Micro-Nano Structures and Their Properties

2015 ◽  
Vol 42 (7) ◽  
pp. 0706003
Author(s):  
范培迅 Fan Peixun ◽  
龙江游 Long Jiangyou ◽  
江大发 Jiang Dafa ◽  
张红军 Zhang Hongjun ◽  
钟敏霖 Zhong Minlin
Keyword(s):  
Broad Band ◽  
Ultrafast Laser ◽  
Laser Fabrication ◽  
Nano Structures

scholarly journals Direct laser write process for 3D conductive carbon circuits in polyimide

2017 ◽  
Vol 5 (20) ◽  
pp. 4923-4930 ◽  
Author(s):  
Bryce Dorin ◽  
Patrick Parkinson ◽  
Patricia Scully
Keyword(s):  
Polymer Films ◽  
Fabrication Process ◽  
Laser Fabrication ◽  
Nano Structures ◽  
Direct Laser

A laser fabrication process in commercial polymer films aimed at creating 3D conductive circuits shows promise for electrically contacting nano-structures.

Ultrafast Laser Fabrication of Hybrid Micro- and Nano-Structures in Semiconductor-doped Borosilicate Glasses

2013 ◽  
Vol 4 (2) ◽  
pp. 87-99 ◽  
Author(s):  
Pavel Mardilovich ◽  
Luke B. Fletcher ◽  
Neil W. Troy ◽  
Lihmei Yang ◽  
Huan Huang ◽  
...  
Keyword(s):  
Ultrafast Laser ◽  
Borosilicate Glasses ◽  
Laser Fabrication ◽  
Nano Structures

scholarly journals Synthesis, and Characteristic Luminescence of Core-Shell SiO2@Eu(MABA-Si)·(phen) Microspheres

2018 ◽  
Vol 142 ◽  
pp. 04002
Author(s):  
Yang-Yang Ma ◽  
Wen-Xian Li ◽  
Yu-Shan Zheng
Keyword(s):  
Silane Coupling Agent ◽  
Fluorescence Spectra ◽  
Silica Surface ◽  
Europium Complex ◽  
Molar Conductivity ◽  
Core Shell ◽  
Element Analysis ◽  
The Core ◽  
Silane Coupling ◽  
20 Nm

Monodispersed SiO2@Eu(MABA-Si)·(phen) core-shell microspheres were synthesized by silane coupling agent method. The core-shell microspheres was used the europium complex Eu(MABA-Si)·(phen)2·(ClO4)3·2H2O as shell and SiO2 as the inorganic core. The europium complex shell has grafted to silica surface through forming a Si-O-Si bond. The europium complex was synthesized by HOOCC6H4N- (CONH(CH2)3Si(OCH2CH3)3)2 (denoted as MABA-Si) and phen coordinated europium perchlorate. The europium complex has been characterized by element analysis, molar conductivity, 1HNMR and IR. The TEM and SEM showed that the diameter of SiO2 core was about 400 nm and the thickness of the europium complex shell was about 20 nm. Fluorescence spectra illustrated that the core-shell microspheres have stronger fluorescence intensity than the europium complex which was 1.87 times.

scholarly journals Effective surface functionalization of fumed silica with NBR telechelic oligomer for high-voltage polyolefin-based dielectric composites

2019 ◽  
pp. 118-122
Author(s):  
Rafal Anyszka ◽  
Xiaozhen He ◽  
Amirhossein Mahtabani ◽  
Wilma K Dierkes ◽  
Anke Blume
Keyword(s):  
High Voltage ◽  
Surface Functionalization ◽  
Silica Surface ◽  
Nano Silica ◽  
Effective Surface ◽  
Carboxylic Acid Groups ◽  
Coupling System ◽  
Modification Procedure ◽  
High Voltage Insulation ◽  
Dielectric Insulation

In this study an effective surface functionalization of fumed nano-silica for dielectric insulation composites is developed. A three step modification procedure was applied: 1. Silanization of the silica surface with (3-glycidoxypropyl)trimethoxysilane (GOPTMS); 2. Grafting of an acrylonitrile-butadiene telechelic oligomer terminated with two carboxylic acid groups (o-NBR); 3. Hydrogenation of the unsaturated polybutadiene segments for better compatibilization with the saturated polyolefin matrices and for higher dielectric performance.The deposition of the coupling system was monitored by thermogravimetric analysis (TGA) revealing 6.4 wt. % of GOPTMS and 13.6 wt. % of o-NBR bond to the silica, resulting in an exceptionally high total deposition (20.0 wt. %). The o-NBR grafting was analyzed qualitatively by Fourier transform infrared spectroscopy (FTIR) showing successful deposition of o-NBR and effective hydrogenation.The silica modified according to this procedure is a promising functional nano-filler for high-voltage insulation composites allowing improved dispersion and distribution in polyolefine matrices and therefore enhancing their electrical properties.

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