scholarly journals Уменьшение работы выхода при гидрогенизации углеродных нанотрубок в плазме водорода

2018 ◽  
Vol 44 (10) ◽  
pp. 55
Author(s):  
С.В. Булярский ◽  
Д.А. Богданова ◽  
Е.П. Кицюк ◽  
А.В. Лакалин ◽  
А.А. Павлов ◽  
...  
Keyword(s):  
Experimental Data ◽  
Carbon Nanotube ◽  
Plasma Treatment ◽  
Work Function ◽  
Quantum Mechanical ◽  
Hydrogen Chemisorption ◽  
Quantum Mechanical Calculations ◽  
Single Walled Cnts ◽  
Walled Cnts

AbstractExperimental data showing a decrease in the work function of carbon nanotube (CNT) bundles and arrays hydrogenated in hydrogen-containing plasma are presented. This plasma treatment leads to hydrogen chemisorption on CNTs, which results in a work-function decrease from 4.8 to 3.3 eV. The experimental data confirm quantum-mechanical calculations for single-walled CNTs of variable chirality. Calculations indicate that a decrease in the CNT work function depends on both the properties of CNT and the degree of its passivation by hydrogen.

Theoretical assessment of wettability on silane coatings: from hydrophilic to hydrophobic

2019 ◽  
Vol 21 (16) ◽  
pp. 8257-8263 ◽  
Author(s):  
Haiming Huang ◽  
Weiliang Wang ◽  
Liming Wang
Keyword(s):  
Work Function ◽  
First Principles ◽  
Potential Distribution ◽  
Surface Hydrophobicity ◽  
Quantum Mechanical ◽  
Quantum Mechanical Calculations ◽  
Graphene Surface ◽  
Surface Modified ◽  
Theoretical Assessment

The potential distribution and work function of a graphene surface modified by various types of silanes are investigated by first principles quantum mechanical calculations to establish its surface hydrophobicity hierarchy.

The experimental determination of the onset of electrical and thermal conductivity percolation thresholds in carbon nanotube-polymer composites

2011 ◽  
Vol 1312 ◽  
Author(s):  
Byung-wook Kim ◽  
Steven Pfeifer ◽  
Sung-Hoon Park ◽  
Prabhakar R. Bandaru
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Percolation Theory ◽  
The Matrix ◽  
Show Evidence ◽  
Percolation Thresholds ◽  
Single Walled Cnts ◽  
Conductivity Contrast ◽  
Walled Cnts

ABSTRACTWe show evidence of electrical and thermal conductivity percolation in polymer based carbon nanotube (CNT) composites, which follow power law variations with respect to the CNT concentrations in the matrix. The experimentally obtained percolation thresholds, i.e., ~ 0.074 vol % for single walled CNTs and ~ 2.0 vol % for multi-walled CNTs, were found to be aspect ratio dependent and in accordance with those determined theoretically from excluded volume percolation theory. A much greater enhancement, over 10 orders of magnitude, was obtained in the electrical conductivity at the percolation threshold, while a smaller increase of ~ 100 % was obtained in the thermal conductivity values. Such a difference is qualitatively explained on the basis of the respective conductivity contrast between the CNT filler and the polymer matrix.

Phonon Transport in Carbon Nanotube Aerogels

2012 ◽  
Author(s):  
Lin Hu ◽  
Haibin Chen ◽  
Gabriella Coloyan ◽  
Alan J. H. McGaughey
Keyword(s):  
Carbon Nanotube ◽  
Thermal Conductance ◽  
Small Diameter ◽  
Radiation Detectors ◽  
Phonon Transport ◽  
Rotational Angle ◽  
Thermal And Electrical Properties ◽  
Electrical Conductors ◽  
Single Walled Cnts ◽  
Walled Cnts

A carbon nanotube (CNT) aerogel is a low-density network of small diameter single-walled CNTs held together by van del Waals forces. Due to the excellent mechanical, thermal, and electrical properties of individual CNTs and the potential to fuse the junctions in the aerogel, CNT aerogels are candidates for ultralight structural media, radiation detectors, thermal insulators, and electrical conductors. Using molecular dynamics (MD) simulation, we predict the thermal conductance of the junction formed between two CNTs. To access the range of conditions present in the aerogel, we test the effects of different boundary conditions, the CNT lengths, and the rotational angle of the CNTs. A 3-D network model of the aerogel is built that will be used with the MD predictions to estimate the aerogel thermal conductivity.

FABRICATION OF CARBON NANOTUBE FIELD EFFECT TRANSISTORS WITH OCMC DISPERSED SINGLE-WALLED CARBON NANOTUBES

2010 ◽  
Vol 09 (04) ◽  
pp. 377-381
Author(s):  
KUMAR RAJ ◽  
QING ZHANG ◽  
LIANGYU YAN ◽  
MARY B. CHAN PARK
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Single Walled Carbon Nanotubes ◽  
Oxygen Adsorption ◽  
P Type ◽  
Walled Carbon Nanotubes ◽  
Single Walled Cnts ◽  
Walled Cnts

We report on the fabrication of carbon nanotube field effect transistors (CNTFETs) from dispersed single-walled CNTs using OCMC (O-Carboxymethylchitosan) as the surfactant. The as-prepared devices exhibit p-type as well as ambipolar characteristics due to oxygen adsorption at the metal/nanotube contacts. The Raman scattering from the SWCNTs shows that OCMC disperses CNTs efficiently. Rapid thermal annealing (RTA) at 400°C for 5 min is found to partially remove OCMC from the surface of SWCNTs.

Impact-resistant carbon nanotube woven films: A molecular dynamics study

Nanoscale ◽  
2021 ◽  
Author(s):  
Fan Wu ◽  
Yushun Zhao ◽  
Yifan Zhao ◽  
Yue Zhao ◽  
Chao Sui ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Carbon Nanotube ◽  
Single Walled Cnts ◽  
Walled Cnts

The fiber-based fabrics have great potentials in impacting protection. Here we proposed a novel nanostructure, where the single-walled CNTs (SWCNTs) was employed to weave plain 2D films. The in-plane mechanical...

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