scholarly journals AA h BN crystal, basic structure of boron nitride nanotubes

IUCrJ ◽  
2021 ◽  
Vol 8 (6) ◽  
Author(s):  
Jae-Kap Lee ◽  
Jin-Gyu Kim ◽  
Seunggun Yu ◽  
Sang-Gil Lee ◽  
Yesong Kim ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Metastable Phase ◽  
Secondary Growth ◽  
Helical Structure ◽  
Basic Structure ◽  
Boron Nitride Nanotubes ◽  
Orthorhombic Space Group ◽  
Orthorhombic Crystal ◽  
Left Handed ◽  
Transmission Electron

AA h boron nitride (BN) crystal, assigned to an orthorhombic space group (No. 31, Pm21), is reported here. This new AA h BN crystal exhibits a `linear' morphology for high-resolution transmission electron microscopy (HRTEM) and a (non-hexagonal) `diagonal' electron-diffraction pattern, which have been experimentally demonstrated in this article. It is also demonstrated that this new crystal is the basic structure of multi-walled BN nanotubes (BNNTs) existing in the form of a helix. The helical AA h BNNTs exist in a metastable phase owing to 〈200〉 texture growth of the orthorhombic crystal, where the energy is ∼15 meV higher than that of stable AB or AA′ BN. It is shown that the typical scanning electron microscope `fluffy cotton-like' morphology of BNNTs is due to secondary growth of diverse BN sheets (including mono-layers) on incoherently scrolled wall strands of BNNTs, providing further evidence for the helical structure with HRTEM evidence for a left-handed helix.

Boron Nitride Nanotubes: Nanoparticles Functionalization and Junction Fabrication

2007 ◽  
Vol 7 (2) ◽  
pp. 530-534 ◽  
Author(s):  
Chunyi Zhi ◽  
Yoshio Bando ◽  
Guozhen Shen ◽  
Chengchun Tang ◽  
Dmitri Golberg
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
X Ray Diffraction ◽  
Carbon Nanostructure ◽  
Wet Chemistry ◽  
X Ray ◽  
Transmission Electron ◽  
First Time

Adopting a wet chemistry method, Au and Fe3O4 nanoparticles were functionalized on boron nitride nanotubes (BNNTs) successfully for the first time. X-ray diffraction pattern and transmission electron microscopy were used to characterize the resultant products. Subsequently, a method was proposed to fabricate heterojunction structures based on the particle-functionalized BNNTs. As a demonstration, BNNT-carbon nanostructure, BNNT-ZnO and BNNT-Ga2O3 junctions were successfully fabricated using the functionalized particles as catalysts.

Selective Synthesis of Boron Nitride Nanotubes

2011 ◽  
Vol 694 ◽  
pp. 408-412
Author(s):  
Lai Ping Zhang ◽  
Ji Lin Wang ◽  
Guo Wei Zhao ◽  
Zhan Hui Zhang ◽  
Fang Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
Selective Synthesis ◽  
Controllable Synthesis ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Transmission Electron ◽  
Bn Nanotubes ◽  
Shs Method

Four types of boron nitride (BN) nanotubes are selectively synthesized by annealing porous precursor in flowing NH3 and NH3/H2 atmosphere at temperature ranging from 1000 to 1200°C in a vertical furnace. The as-synthesized BN nanotubes, including cylinder, wave, bamboo and bubble-chain, are characterized by scanning and transmission electron microscopy. Selectivity of BN nanotubes is estimated as approximately 80 to 95%. The porous precursor B31Fe17(MgO)27 prepared by self-propagation high-temperature synthesis (SHS) method plays a key role in controllable synthesis of the as-grown BN nanotubes. The chemical reaction and annealing mechanism are also discussed.

Ultrafast structural dynamics of boron nitride nanotubes studied using transmitted electrons

Nanoscale ◽  
2017 ◽  
Vol 9 (35) ◽  
pp. 13313-13319 ◽  
Author(s):  
Zhongwen Li ◽  
Shuaishuai Sun ◽  
Zi-An Li ◽  
Ming Zhang ◽  
Gaolong Cao ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Electron Diffraction ◽  
Boron Nitride ◽  
Femtosecond Laser ◽  
Structural Dynamics ◽  
Laser System ◽  
Boron Nitride Nanotubes ◽  
Ultrafast Electron Diffraction ◽  
Transmission Electron ◽  
System P

Ultrafast electron diffraction studies of structural dynamics of boron nitride nanotubes using a transmission electron microscope with a femtosecond laser system.

Boron Nitride Nanotube, Nanocable and Nanocone

2001 ◽  
Vol 706 ◽  
Author(s):  
Dmitri Golberg ◽  
Yoshio Bando ◽  
Laure Bourgeois ◽  
Renzhi Ma ◽  
Kazuhiko Ogawa ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Nitrogen Atmosphere ◽  
Boron Nitride Nanotubes ◽  
X Ray ◽  
Atomic Structures ◽  
Transmission Electron ◽  
Electron Energy Loss Spectrometer ◽  
Line Defects ◽  
Electron Energy Loss ◽  
Bn Nanotubes

AbstractBoron nitride nanotubes, nanocones and nanocables were prepared and their atomic structures were identified by using a 300 kV field emission transmission electron microscope equipped with an electron energy loss spectrometer and energy dispersion X-ray detector. Multiwalled BN nanotubes and nanocones were synthesized by reacting C nanotube templates and boron oxide under nitrogen atmosphere at 1723-2023 K. Additions of metal oxide promoters, e.g. MoO3, CuO, and PbO, significantly improved BN-rich nanotube yield at the expense of B-C-N nanotubes. It was shown that BN nanotubes had preferential “zigzag” chirality and exhibited either hexagonal or rhombohedral stacking between shells. An efficient synthetic route for bulk quantities of BN tube production was also developed, where a B-N-O precursor was used during a CVD process. Nanocones of BN were mostly found to have 240° disclinations which ensure the presence of B-N bonds only. One case was observed of a cone constituted of 300° disclination implying that structures may contain line defects of non B-N bonds. The first synthesis of insulating BN nanocables was carried out, where BN nanotubes were entirely filled with Invar Fe-Ni nanorods. The filled nanotube diameters ranged between 30 to 300 nm, whereas the length of filling reached several microns.

scholarly journals Intrinsic and Defect-Related Elastic Moduli of Boron Nitride Nanotubes As Revealed by in Situ Transmission Electron Microscopy

Nano Letters ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 4974-4980 ◽  
Author(s):  
Xin Zhou ◽  
Dai-Ming Tang ◽  
Masanori Mitome ◽  
Yoshio Bando ◽  
Takayoshi Sasaki ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Boron Nitride ◽  
Elastic Moduli ◽  
Boron Nitride Nanotubes ◽  
Transmission Electron

Boron nitride nanotubes/polystyrene composites

2006 ◽  
Vol 21 (11) ◽  
pp. 2794-2800 ◽  
Author(s):  
Chunyi Zhi ◽  
Yoshio Bando ◽  
Chengchun Tang ◽  
Susumu Honda ◽  
Hiroaki Kuwahara ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Vapor Deposition ◽  
Composite Films ◽  
Chemical Vapor ◽  
Tensile Tests ◽  
Boron Nitride Nanotubes ◽  
Chemical Vapor Deposition Method ◽  
Transmission Electron ◽  
Good Transparency ◽  
First Time

Boron nitride nanotube (BNNT)/polystyrene (PS) composite films were fabricated for the first time using high-quality BNNTs synthesized via a chemical-vapor-deposition method. The composite films exhibited good transparency. Tensile tests indicated that the elastic modulus of the films was increased by ∼21% when a ∼1 wt% soluble BNNT fraction was in use. Dispersion of BNNTs in PS and interfacial interactions between them were investigated using transmission electron microscopy. The film thermal properties, such as stability to oxidation and glass transition temperatures were measured. The experimental results and simple theoretical estimates indicate that BNNTs is a promising additive material for polymeric composites.

scholarly journals Synthesis of Boron Nitride Nanotubes Using Plasma-Assisted CVD Catalyzed by Cu Nanoparticles and Oxygen

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 651
Author(s):  
Tatsuya Shiratori ◽  
Ichiro Yamane ◽  
Shoto Nodo ◽  
Ryo Ota ◽  
Takashi Yanase ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Chemical Vapor ◽  
Radial Breathing Mode ◽  
Boron Nitride Nanotubes ◽  
Shell Structures ◽  
Core Shell ◽  
Cu Nanoparticles ◽  
Transmission Electron ◽  
Mode Vibration

We found that oxidized Cu nanoparticles can catalyze the growth of boron nitride nanotubes from borazine via plasma-assisted chemical vapor deposition. The Raman spectra suggest that the formation of thin-walled nanotubes show a radial breathing mode vibration. The presence of oxygen in the plasma environment was necessary for the growth of the nanotubes, and a part of the nanotubes had a core shell structure with a cupper species inside it. In atomic resolution transmission electron microscope (TEM) images, Cu2O was found at the interface between the Cu-core and turbostratic BN-shell. The growth mechanism seemed different from that of carbon nanotube core-shell structures. Therefore, we pointed out the important role of the dynamic morphological change in the Cu2O-Cu system.

In situ Electrical Conductivity Measurement for Functionalized Boron Nitride Nanotubes by Transmission Electron Microscopy.

2012 ◽  
Vol 18 (S2) ◽  
pp. 1580-1581
Author(s):  
A. Asthana ◽  
B. Hao ◽  
Y. Yap ◽  
R. Yassar
Keyword(s):  
Electron Microscopy ◽  
Electrical Conductivity ◽  
Transmission Electron Microscopy ◽  
Boron Nitride ◽  
Conductivity Measurement ◽  
Boron Nitride Nanotubes ◽  
Electrical Conductivity Measurement ◽  
Transmission Electron

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

Boron nitride nanotube@NiFe2O4: a highly efficient system for magnetohyperthermia therapy

Nanomedicine ◽  
2019 ◽  
Vol 14 (23) ◽  
pp. 3075-3088
Author(s):  
Thaylice CS Cabral ◽  
José D Ardisson ◽  
Marcelo C de Miranda ◽  
Dawidson A Gomes ◽  
Luis E Fernandez-Outon ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Ferrite Nanoparticles ◽  
Boron Nitride Nanotubes ◽  
Cancer Therapies ◽  
Single Cycle ◽  
Efficient System ◽  
Highly Efficient ◽  
Transmission Electron ◽  
Magnetic Heating ◽  
Nickel Ferrite Nanoparticles

Aim: The field of nanotechnology promotes the development of innovative and more effective cancer therapies. This work is aimed to develop a hybrid system that combines the capacity of boron nitride nanotubes (BNNTs) to be internalized by tumor cells and the ability of nickel ferrite nanoparticles to efficiently release heat by induced AC magnetic heating. Materials & methods: The systems studied were characterized by using x-ray diffractometry, transmission electron microscopy, vibrating sample magnetometry and Mössbauer spectroscopy. Results: The ferrite nanoparticles attached to BNNT were able to achieve the required temperatures for magnetohyperthermia therapies. After cellular internalization, AC induced magnetic heating of BNNT@NiFe2O4 can kill almost 80% of Hela cells lineage in a single cycle. Conclusion: This system can be a highly efficient magnetohyperthermia agent in cancer therapy.

On the Mechanical Behavior of Boron Nitride Nanotubes

2010 ◽  
Vol 63 (2) ◽  
Author(s):  
H. M. Ghassemi ◽  
R. S. Yassar
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Boron Nitride ◽  
Resonance Method ◽  
Boron Nitride Nanotubes ◽  
Published Data ◽  
Transmission Electron ◽  
Thermal Vibrations ◽  
Bn Nanotubes

Boron nitride (BN) nanotubes have structural and mechanical properties similar to carbon nanotubes and are known to be the strongest insulators. Great interest has been focused on understanding the mechanical properties of BN nanotubes as a function of their structural and physical properties. Yet, the published data have not been reviewed and systematically compared. In this paper, we critically review the mechanical properties of BN nanotubes from both experimental and simulation perspectives. The experimental reports include thermal vibrations, electric induced resonance method, and in situ force measurements inside transmission electron microscopy. The modeling and simulation efforts encompass tight bonding methods and molecular dynamics. Replacing the covalent sp2 bond (C–C) by ionic bond (B–N) results in differences in the mechanical properties of BN nanotubes in comparison to carbon nanotubes. The experimental and computational simulations indicate that BN nanotubes are highly flexible. High necking angles in BN nanotubes are assumed to be correlated with unfavorable bonding in B–B and N–N atoms.

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