Hydrogenated carbon nanotube-based spin caloritronics

2017 ◽  
Vol 19 (32) ◽  
pp. 21507-21513 ◽  
Author(s):  
Hong-Li Zeng ◽  
Yan-Dong Guo ◽  
Xiao-Hong Yan ◽  
Jie Zhou
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electric Field ◽  
Gate Voltage ◽  
Seebeck Effect ◽  
Partial Hydrogenation ◽  
Spin Caloritronics ◽  
Spin Seebeck Effect ◽  
Or Gate

The spin-Seebeck effect (SSE) in linearly hydrogenated carbon nanotubes (CNTs) is realized, where partial hydrogenation makes CNTs acquire magnetism. Moreover, an odd–even effect of the SSE is observed, and the even cases could be used as spin-Seebeck diodes, without the need for an electric field or gate voltage.

scholarly journals How to realize the spin-Seebeck effect with a high spin figure of merit in magnetic boron–nitrogen nanoribbon and nanotube structures?

2018 ◽  
Vol 6 (39) ◽  
pp. 10603-10610 ◽  
Author(s):  
Dan-Dan Wu ◽  
Hua-Hua Fu ◽  
Qing-Bo Liu ◽  
Ruqian Wu
Keyword(s):  
High Spin ◽  
Figure Of Merit ◽  
Seebeck Effect ◽  
The Core ◽  
Spin Caloritronics ◽  
Spin Seebeck Effect ◽  
Boron Nitrogen

The spin-Seebeck effect (SSE) has been regarded as one of the core topics in spin caloritronics.

Metallic Nanowires From Carbon Nanotube Building Blocks: The Effect of Atomic Defects on the Nanotube Influencing Nanowire Growth

2003 ◽  
Author(s):  
B. Panchapakesan ◽  
Kousik Sivakumar ◽  
Shaoxin Lu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electric Field ◽  
Building Blocks ◽  
Model Systems ◽  
Initial Surface ◽  
Sensors And Actuators ◽  
Platinum Nanowires ◽  
Defect Sites ◽  
Current Densities

Manipulation and control of matter at the nano- and atomic level are crucial for the success of nano-scale sensors and actuators. The ability to control and synthesize multilayer structures using carbon nanotubes that will enable to build electronic devices within a nanotube is still in its infancy. In this paper, we present results on selective electric field assisted deposition of metals on carbon nanotubes realizing metallic nanowire structures. Silver and platinum nanowires has been fabricated using this approach due to its applications in chemical sensing sensing as catalytic materials to sniff toxic agents and in the area of biomedical nanotechnology for construction of artificial muscles. The electric field assisted technique allows the deposition of metals with high degree of selectivity on carbon nanotubes by manipulating the charges on the surface of the nanotubes. The thickness and the growth of the nanowires was altered by inducing defects on the initial surface of the nanotubes that affected the local current densities and electrochemical reduction of silver and platinum on those defect sites. SEM and TEM investigations revealed silver and platinum nanowires between 10 nm-100 nm in diameter. Relatively higher metal deposition was achieved in defect related sites or places where the nanotubes criss-crossed each other, due to the high current densities in these sites. The present technique is versatile and enables the fabrication of host of different types of metallic and semiconduting nanowires using carbon nanotube templates for nanoelectronics and myriad of sensor applications. Further, nanowires can also serve as model systems for studying quantum size effects in these dimensions.

Gate-voltage induced giant spin Seebeck effect in phosphorene nanoribbons

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
Rouhollah Farghadan ◽  
Fereshte Ildarabadi
Keyword(s):  
Gate Voltage ◽  
Seebeck Effect ◽  
Spin Seebeck Effect

scholarly journals Electric fields can control the transport of water in carbon nanotubes

2016 ◽  
Vol 374 (2060) ◽  
pp. 20150025 ◽  
Author(s):  
Konstantinos Ritos ◽  
Matthew K. Borg ◽  
Nigel J. Mottram ◽  
Jason M. Reese
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Liquid Crystal ◽  
Carbon Nanotube ◽  
Electric Field ◽  
Electric Fields ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Molecular Ordering ◽  
Technological Interest

The properties of water confined inside nanotubes are of considerable scientific and technological interest. We use molecular dynamics to investigate the structure and average orientation of water flowing within a carbon nanotube. We find that water exhibits biaxial paranematic liquid crystal ordering both within the nanotube and close to its ends. This preferred molecular ordering is enhanced when an axial electric field is applied, affecting the water flow rate through the nanotube. A spatially patterned electric field can minimize nanotube entrance effects and significantly increase the flow rate.

One-step fabrication of silver nanosphere-wetted carbon nanotube electrodes via electric-field-driven combustion waves for high-performance flexible supercapacitors

2019 ◽  
Vol 7 (15) ◽  
pp. 9004-9018 ◽  
Author(s):  
Taehan Yeo ◽  
Jaeho Lee ◽  
Dongjoon Shin ◽  
Seonghyun Park ◽  
Hayoung Hwang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electric Field ◽  
High Performance ◽  
Combustion Waves ◽  
Flexible Supercapacitors ◽  
Ag Particles ◽  
Multi Walled Carbon Nanotubes ◽  
One Step ◽  
Walled Carbon Nanotubes

Electric-field driven combustion waves yield completely wetted hybrids of single-crystalline, spherical Ag particles and multi-walled carbon nanotubes for high-performance supercapacitors.

Concept of the Tip Effect in Single Walled Carbon Nanotube

2015 ◽  
Vol 1099 ◽  
pp. 37-40
Author(s):  
Khalil El-Hami ◽  
Abdelkhalak El-Hami
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
Field Strength ◽  
Electric Field ◽  
Surface Charge Density ◽  
Geometrical Parameters ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Field Lines

In this investigation, we reported that single walled carbon nanotube can act as a sharpest tip where the electric field strength is highly concentrated at the edge. Therefore, we study the effects of the physical and geometrical parameters of an applied electric field gradient to various electrode structures. Results showed that carbon nanotubes presented a strongest electric field value at the edge which makes them suited for applications as unidirectional electric field or serving as nanoelectrode with a diameter of about one nanometer to be used for conductivity nanotest and to determine the electrical properties of single molecules or clusters.Keywords: single walled carbon nanotube, nan-electrode, tip, electric field lines, surface charge density.

scholarly journals The transport of a charged peptide through carbon nanotubes under an external electric field: a molecular dynamics simulation

RSC Advances ◽  
2021 ◽  
Vol 11 (38) ◽  
pp. 23589-23596
Author(s):  
Wen Li ◽  
Shun Cheng ◽  
Bin Wang ◽  
Zheng Mao ◽  
Jianhua Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
Molecular Dynamics Simulation ◽  
Electric Field ◽  
External Electric Field ◽  
Dynamics Simulation

The role of electric field and types of carbon nanotube influencing the delivery process of peptide through CNTs were studied via all-atom molecular dynamics simulation.

Electron Emission from Microwave-Plasma Chemically Vapor Deposited Carbon Nanotubes

2000 ◽  
Vol 621 ◽  
Author(s):  
Yonhua Tzeng ◽  
Chao Liu ◽  
Calvin Cutshaw ◽  
Zheng Chen
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electric Field ◽  
Electron Emission ◽  
Microwave Plasma ◽  
High Vacuum ◽  
Field Enhancement ◽  
Current Voltage ◽  
Microwave Plasma Cvd ◽  
Field Emission Of Electrons

ABSTRACTA microwave plasma CVD reactor was used for the deposition of carbon nanotubes on substrates. Hydrocarbon or oxyhydrocarbon mixtures were used as the carbon source. Hot electrons in the microwave plasma at temperatures exceeding 10,000C provided a means of dissociating the vapor or gas feedstock, heating the substrate, and allowing gas species to react in the gas phase as well as on the surface of the substrate leading to the deposition of desired carbon coatings. A high vacuum chamber was used to characterize the electron emission properties of these carbon nanotube coatings using a one-millimeter diameter tungsten rod with a hemispherical tip as the anode while the carbon nanotube coatings served as the cathode. The current-voltage characteristics of the carbon nanotube coatings were measured and used for calculating the electric field at which electron emission turned on as well as calculating the field enhancement factor of the carbon nanotubes. Field emission of electrons from carbon nanotubes starting from an electric field lower than 1 volt per micrometer has been achieved.

Spin Seebeck effect

2017 ◽  
Author(s):  
K. Uchida ◽  
R. Ramos ◽  
E. Saitoh
Keyword(s):  
Magnetic Field ◽  
Spin Current ◽  
Seebeck Effect ◽  
Crucial Importance ◽  
Multilayer Systems ◽  
Thermoelectric Conversion ◽  
Spin Caloritronics ◽  
Spin Seebeck Effect ◽  
Field Response ◽  
Basic Characteristics

Chapter 18 This chapter discusses the spin Seebeck effect (SSE), which stands for the generation of a spin current, a flow of spinangular momentum, as a result of a temperature gradient in magnetic materials. In spintronics and spin caloritronics, the SSE is of crucial importance because it enables simple and versatile generation of a spin current from heat. Since the SSE is driven by thermally excited magnon dynaimcs, the thermal spin current can be generated not only from ferromagnetic conductors but also from insulators. Therefore, the SSE is applicable to “insulator-based thermoelectric conversion” which was impossible if only conventional thermoelectric technologies were used. In this chapter, after introducing basic characteristics and mechanisms of the SSE, important experimental progresses, such as the high-magnetic-field response of the SSE and the enhancement of the SSE in multilayer systems, are reviewed.

Hot-Filament Assisted Fabrication of Carbon-Nanotube Electron Emitters

2000 ◽  
Vol 621 ◽  
Author(s):  
Yonhua Tzeng ◽  
Chao Liu ◽  
Zheng Chen
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electric Field ◽  
Electron Emission ◽  
High Vacuum ◽  
Field Enhancement ◽  
Current Voltage ◽  
Electron Emitters ◽  
Hot Filament ◽  
Field Emission Of Electrons

ABSTRACTA hot-filament CVD reactor was used for the deposition of carbon nanotubes on substrates. Hydrocarbon or oxyhydrocarbon mixtures were used as the carbon source. Hot filaments at temperatures exceeding 2000C provided a means of dissociating the vapor or gas feedstock, heating the substrate, and allowing gas species to react in the gas phase as well as on the surface of the substrate leading to the deposition of desired carbon coatings. A high vacuum chamber was used to characterize the electron emission properties of these carbon nanotube coatings using a one-millimeter diameter tungsten rod with a hemispherical tip as the anode while the carbon nanotube coatings served as the cathode. The current-voltage characteristics of the carbon nanotube coatings were measured and used for calculating the electric field at which electron emission turned on as well as calculating the field enhancement factor of the carbon nanotubes. Field emission of electrons from carbon nanotubes starting from an electric field of as low as 1-2 volts per micrometer was achieved.

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