scholarly journals The Microstructure of Ni Layer on Single-Walled Carbon Nanotubes Prepared by an Electroless Coating Process

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Weixue Li ◽  
Hui Jin ◽  
Yuan Hao ◽  
Tijun Chen ◽  
Jianfeng Dai ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Deposition Process ◽  
Compound Layer ◽  
Intermetallic Compound Layer ◽  
Face Centered Cubic ◽  
Single Walled Carbon ◽  
Before And After ◽  
Walled Carbon Nanotubes

The single-walled carbon nanotubes (SWNTs, diameter: 2~3 nm), which were obtained in the suspension of purification solution, with Ni-P coating layers were obtained by an electroless deposition process. The SWNTs before and after coating were characterized by transmission electron microscopy (TEM) and energy dispersive spectrometry (EDS). An Ni-P layer on individual nanotube with thickness of 20 nm can be obtained after the deposition process. The X-ray diffraction (XRD) and selected area electron diffraction (SAED) analysis of Ni-P SWNTs before and after heat treatment show that the heat treatment caused the transformation of the amorphous Ni-P layer to the nanocrystalline Ni-P (crystalline Ni andNi3P intermetallic compound) layer. The XRD pattern of SWNTs with Ni-P layers after heat treatment revealed that the crystal structures of Ni in plating layer contained: hexagonal close-packed (hcp) structure and face-centered cubic (fcc) structure. The lattice parameters of Ni (fcc) andNi3P are larger than the bulk's, indicting that the lattice expansion has taken place. However, the lattice parameter of Ni (hcp) has no difference from the bulk's.

The Lattice Change of Ni-P Layer Coated on Single-Walled Carbon Nanotubes

2011 ◽  
Vol 194-196 ◽  
pp. 467-470
Author(s):  
Wei Xue Li ◽  
Gang Shi ◽  
Jian Feng Dai ◽  
Qing Wang
Keyword(s):  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Electroless Deposition ◽  
Single Walled Carbon Nanotubes ◽  
Compound Layer ◽  
Intermetallic Compound Layer ◽  
Pristine Cnts ◽  
Before And After ◽  
Excellent Method ◽  
Walled Carbon Nanotubes

The electroless deposition is an excellent method for the preparation of the CNTs with Ni-P layers. Pristine CNTs were first oxygen-functionalized by treating them with a mixture of concentrated (HNO3 :H2SO4=1:3) acids. The SWNTs were obtained in the suspension of purification solution, In this work, the heat-treatment at 400°С transformed the amorphous Ni-P layer into the nanocrystalline Ni-P (crystalline Ni and Ni3P intermetallic compound) layer. The Ni-P-SWNTs before and after heat-treatment were studied using XRD and SAED. It is observed that the lattice parameters of Ni-P layers has difference from the bulk’s, indicting that the lattice change has taken place.

scholarly journals Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 818 ◽  
Author(s):  
Olga Sedelnikova ◽  
Olga Gurova ◽  
Anna Makarova ◽  
Anastasiya Fedorenko ◽  
Anton Nikolenko ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Functional Properties ◽  
Single Walled Carbon Nanotubes ◽  
Acceptor Interaction ◽  
Local Composition ◽  
X Ray ◽  
Single Walled Carbon ◽  
Before And After ◽  
Donor Acceptor ◽  
Walled Carbon Nanotubes

Filling of single-walled carbon nanotubes (SWCNTs) and extraction of the encapsulated species from their cavities are perspective treatments for tuning the functional properties of SWCNT-based materials. Here, we have investigated sulfur-modified SWCNTs synthesized by the ampoule method. The morphology and chemical states of carbon and sulfur were analyzed by transmission electron microscopy, Raman scattering, thermogravimetric analysis, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopies. Successful encapsulation of sulfur inside SWCNTs cavities was demonstrated. The peculiarities of interactions of SWCNTs with encapsulated and external sulfur species were analyzed in details. In particular, the donor–acceptor interaction between encapsulated sulfur and host SWCNT is experimentally demonstrated. The sulfur-filled SWCNTs were continuously irradiated in situ with polychromatic photon beam of high intensity. Comparison of X-ray spectra of the samples before and after the treatment revealed sulfur transport from the interior to the surface of SWCNTs bundles, in particular extraction of sulfur from the SWCNT cavity. These results show that the moderate heating of filled nanotubes could be used to de-encapsulate the guest species tuning the local composition, and hence, the functional properties of SWCNT-based materials.

The High Thickness Ni Layer on Single-Walled Carbon Nanotubes Prepared by an Electroless Coating Process

2010 ◽  
Vol 148-149 ◽  
pp. 1607-1610
Author(s):  
Wei Xue Li ◽  
Dun Dong Wang ◽  
Hui Jin ◽  
Jian Feng Dai ◽  
Qing Wang
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Deposition Process ◽  
X Ray Diffraction ◽  
Electroless Coating ◽  
Single Walled Carbon ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
20 Nm ◽  
Walled Carbon Nanotubes

The Single-walled carbon nanotubes were coated with Ni-P layers by an electroless plating technique. A Ni-P layers are thick and smooth and on individual nanotube with thickness of 20 nm can be obtained after the deposition process. The Single-walled carbon nanotubes were obtained in the suspension of purification solution. The samples have been characterized by X-ray diffraction, selected area electron diffraction, transmission electron microscopy and energy dispersive spectrometry.The coating layers after heat-treatment convert the amorphous Ni-P coated layers into the nanocrystalline Ni-P layers.

Coalescence of parallel finite length single-walled carbon nanotubes by heat treatment

2013 ◽  
Vol 74 (3) ◽  
pp. 436-440 ◽  
Author(s):  
Xueming Yang ◽  
Fangwei Qiao ◽  
Xiaoxun Zhu ◽  
Pu Zhang ◽  
Dongci Chen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Finite Length ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Improving the conductivity of single-walled carbon nanotubes films by heat treatment

2009 ◽  
Vol 485 (1-2) ◽  
pp. 456-461 ◽  
Author(s):  
Jiaping Wang ◽  
Jing Sun ◽  
Lian Gao ◽  
Yangqiao Liu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Influence of heat treatment on field emissive properties of single-walled carbon nanotubes

2002 ◽  
Vol 195 (1-4) ◽  
pp. 20-30 ◽  
Author(s):  
Gengmin Zhang ◽  
Zhaoxiang Zhang ◽  
Hao Zhang ◽  
Jianping Sun ◽  
Shimin Hou ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes
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