scholarly journals Size Distribution, Mechanical and Electrical Properties of CuO Nanowires Grown by Modified Thermal Oxidation Methods

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1051 ◽  
Author(s):  
Raitis Sondors ◽  
Jelena Kosmaca ◽  
Gunta Kunakova ◽  
Liga Jasulaneca ◽  
Matiss Martins Ramma ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Aspect Ratio ◽  
Electric Field ◽  
Thermal Oxidation ◽  
Size Distribution ◽  
High Aspect Ratio ◽  
Growth Conditions ◽  
Cuo Nanowires ◽  
Young’S Moduli ◽  
Order Of Magnitude

Size distribution, Young’s moduli and electrical resistivity are investigated for CuO nanowires synthesized by different thermal oxidation methods. Oxidation in dry and wet air were applied for synthesis both with and without an external electrical field. An increased yield of high aspect ratio nanowires with diameters below 100 nm is achieved by combining applied electric field and growth conditions with additional water vapour at the first stage of synthesis. Young’s moduli determined from resonance and bending experiments show similar diameter dependencies and increase above 200 GPa for nanowires with diameters narrower than 50 nm. The nanowires synthesized by simple thermal oxidation possess electrical resistivities about one order of magnitude lower than the nanowires synthesized by electric field assisted approach in wet air. The high aspect ratio, mechanical strength and robust electrical properties suggest CuO nanowires as promising candidates for NEMS actuators.

Cooperative Self-Assembly of Pyridine-2,6-Diimine-Linked Macrocycles into Mechanically Robust Nanotubes

2019 ◽  
Author(s):  
Michael J. Strauss ◽  
Darya Asheghali ◽  
Austin Evans ◽  
Rebecca Li ◽  
Anton Chavez ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Synthetic Polymers ◽  
Young’S Moduli ◽  
Structural Rigidity ◽  
Assembly Mechanism ◽  
Low Dimensionality ◽  
Harsh Conditions

<p>Nanotubes assembled from macrocyclic precursors offer a unique combination of low dimensionality, structural rigidity, and distinct interior and exterior microenvironments. Usually the weak stacking energies of macrocycles limit the length or strength of the resultant nanotubes. Imine-linked macrocycles were recently found to assemble into high-aspect ratio (>10<sup>3</sup>), lyotropic nanotubes in the presence of excess acid. Yet these harsh conditions are incompatible with many functional groups and processing methods, and lower acid loadings instead catalyze macrocycle degradation. Here we report pyridine-2,6-diimine-linked macrocycles that assemble into high-aspect ratio nanotubes in the presence of less than 1 equiv of CF<sub>3</sub>CO<sub>2</sub>H per macrocycle. Analysis by gel permeation chromatography and fluorescence spectroscopy revealed a cooperative self-assembly mechanism. Nanofibers obtained by touch-spinning the pyridinium-based nanotubes exhibit Young’s moduli of 1.48 GPa, which exceeds that of many synthetic polymers and biological filaments. These findings will enable the design of structurally diverse nanotubes from synthetically accessible macrocycles. </p>

High Aspect Ratio Tilted Gratings Through Local Electric Field Modulation in Plasma Etching

2021 ◽  
Author(s):  
Zhitian Shi ◽  
Konstantins Jefimovs ◽  
Antonino La Magna ◽  
Marco Stampanoni ◽  
Lucia Romano
Keyword(s):  
Aspect Ratio ◽  
Electric Field ◽  
Plasma Etching ◽  
High Aspect Ratio ◽  
Local Electric Field ◽  
Field Modulation

Morphology and electrical properties of high aspect ratio ZnO nanowires grown by hydrothermal method without repeated batch process

2012 ◽  
Vol 101 (8) ◽  
pp. 083905 ◽  
Author(s):  
Jin Woo Cho ◽  
Churl Seung Lee ◽  
Kyoung Il Lee ◽  
Seon Min Kim ◽  
Sung Hyun Kim ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Aspect Ratio ◽  
Hydrothermal Method ◽  
High Aspect Ratio ◽  
Batch Process ◽  
Zno Nanowires ◽  
Repeated Batch ◽  
Repeated Batch Process

Fast Ion Loss and Radial Electric Field in High-Aspect-Ratio Stellarator

1992 ◽  
Vol 61 (7) ◽  
pp. 2294-2303 ◽  
Author(s):  
Kimitaka Itoh ◽  
Heiji Sanuki ◽  
Sanae-I. Itoh
Keyword(s):  
Aspect Ratio ◽  
Electric Field ◽  
High Aspect Ratio ◽  
Radial Electric Field ◽  
Fast Ion

Suspensions of carbon nanofibers in organic medium: rheo-electrical properties

2015 ◽  
Vol 17 (48) ◽  
pp. 32316-32327 ◽  
Author(s):  
Mohamed Youssry ◽  
Dominique Guyomard ◽  
Bernard Lestriez
Keyword(s):  
Electrical Properties ◽  
Aspect Ratio ◽  
Carbon Nanofibers ◽  
Propylene Carbonate ◽  
High Aspect Ratio ◽  
Structural Evolution ◽  
Organic Medium

The nonaqueous suspensions of carbon nanofibers (CNFs) in 1 M lithium bis(trifluoromethanesulfonaimide) in propylene carbonate electrolyte reveal unique structural evolution and shear-induced transition due to the high aspect ratio.

scholarly journals High aspect ratio lead zirconate titanate tube structures: II. Directed assembly via dielectrophoresis

2012 ◽  
Vol 6 (1) ◽  
pp. 43-51
Author(s):  
Vladimír Kovaľ
Keyword(s):  
Aspect Ratio ◽  
Electric Field ◽  
Lead Zirconate Titanate ◽  
High Aspect Ratio ◽  
Colloidal Suspension ◽  
Lead Zirconate ◽  
Uniform Electric Field ◽  
Outer Diameter ◽  
Electrode Gap ◽  
Zirconate Titanate

This paper reports on the controlled manipulation of high aspect ratio ferroelectric microtubes on pre-patterned templates by dielectrophoresis. Microtubes of ferroelectric lead zirconate titanate (PZT, a chemical formula of Pb(Zr0.52Ti0.48 )O3) with an outer diameter of 2 ?m, a length of about 30 ?m and a wall thickness of 400 nm were prepared by vacuum infiltration method using macroporous silicon templates. To position and align tubes at designed places, an alternating electric field was applied to a colloidal suspension of PZT tubes through lithographically defined microelectrodes. This would enable creation of a stable electrical connection to individual tubes for making a testing structure for rapid electrical characterization. Electric-field assisted assembly experiments demonstrated that the frequency and magnitude of the applied electric field control dielectrophoretic long-range forces, and hence spatial movement of the tubes in a non-uniform electric field. The most efficient biasing for the assembly of tubes across the electrode gap of 12 ?m was a square wave signal of 5 Vrms and 10 Hz. By varying the applied frequency in between 1 and 10 Hz, an enhancement in tube alignment was observed due to possible changes in dielectrophoretic torque. The results indicate a great potential for utilizing dielectrophoresis in construction of more complex, hierarchical 3-D device structures using the PZT 1-D like tubes as the building units.

Cooperative Self-Assembly of Pyridine-2,6-Diimine-Linked Macrocycles into Mechanically Robust Nanotubes

2019 ◽  
Author(s):  
Michael J. Strauss ◽  
Darya Asheghali ◽  
Austin Evans ◽  
Rebecca Li ◽  
Anton Chavez ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Synthetic Polymers ◽  
Young’S Moduli ◽  
Structural Rigidity ◽  
Assembly Mechanism ◽  
Low Dimensionality ◽  
Harsh Conditions

<p>Nanotubes assembled from macrocyclic precursors offer a unique combination of low dimensionality, structural rigidity, and distinct interior and exterior microenvironments. Usually the weak stacking energies of macrocycles limit the length or strength of the resultant nanotubes. Imine-linked macrocycles were recently found to assemble into high-aspect ratio (>10<sup>3</sup>), lyotropic nanotubes in the presence of excess acid. Yet these harsh conditions are incompatible with many functional groups and processing methods, and lower acid loadings instead catalyze macrocycle degradation. Here we report pyridine-2,6-diimine-linked macrocycles that assemble into high-aspect ratio nanotubes in the presence of less than 1 equiv of CF<sub>3</sub>CO<sub>2</sub>H per macrocycle. Analysis by gel permeation chromatography and fluorescence spectroscopy revealed a cooperative self-assembly mechanism. Nanofibers obtained by touch-spinning the pyridinium-based nanotubes exhibit Young’s moduli of 1.48 GPa, which exceeds that of many synthetic polymers and biological filaments. These findings will enable the design of structurally diverse nanotubes from synthetically accessible macrocycles. </p>

High-Rate Etching of Mn-Zn Ferrite by Laser-Induced Chemical Reaction in CC12F2 Atmosphere

1990 ◽  
Vol 201 ◽  
Author(s):  
Y. F. Lu ◽  
M. Takai ◽  
S. Nagatomo ◽  
S. Namba
Keyword(s):  
Aspect Ratio ◽  
Chemical Reaction ◽  
High Aspect Ratio ◽  
Dwell Time ◽  
Gas Pressure ◽  
High Rate ◽  
Aspect Ratios ◽  
Zn Ferrite ◽  
Order Of Magnitude ◽  
Ion Laser

AbstractMaskless dry etching of Mn-Zn ferrite in dich1orodif1uoromethane (CC12F2) by Ar+-ion laser (514.5 nm-line) irradiation has been investigated to obtain high etching rates and aspect-ratios of etched grooves. The etching reaction was found to be thermochemical and caused by Cl radicals thermally decomposed from CCl2F2 gas. High etching rates of up to 360 μm/s, which is about one order of magnitude higher than that in a CCl4 gas and even higher than that in a H3PO4 solution, have been achieved. A high aspect-ratio of up to 12 was obtained. Definite gas pressure and dwell time are necessary to fabricate a smooth groove.

scholarly journals Study of 3D-growth conditions for selective area MOVPE of high aspect ratio GaN fins with non-polar vertical sidewalls

2017 ◽  
Vol 476 ◽  
pp. 90-98 ◽  
Author(s):  
Jana Hartmann ◽  
Frederik Steib ◽  
Hao Zhou ◽  
Johannes Ledig ◽  
Lars Nicolai ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Growth Conditions ◽  
Selective Area
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