Optoelectronic studies of boron nitride nanotubes and hexagonal boron nitride crystals by photoconductivity and photoluminescence spectroscopy experiments

2010 ◽  
Vol 247 (11-12) ◽  
pp. 3076-3079 ◽  
Author(s):  
Gurvan Brasse ◽  
Sylvain Maine ◽  
Aurélie Pierret ◽  
Périne Jaffrennou ◽  
Brigitte Attal-Trétout ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
Photoluminescence Spectroscopy

scholarly journals Four-dimensional vibrational spectroscopy for nanoscale mapping of phonon dispersion in BN nanotubes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ruishi Qi ◽  
Ning Li ◽  
Jinlong Du ◽  
Ruochen Shi ◽  
Yang Huang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Energy Loss ◽  
Phonon Dispersion ◽  
Hexagonal Boron Nitride ◽  
Real Space ◽  
Boron Nitride Nanotubes ◽  
Detection Sensitivity ◽  
Optical Modes ◽  
Optical And Mechanical Properties ◽  
Energy And Momentum

AbstractDirectly mapping local phonon dispersion in individual nanostructures can advance our understanding of their thermal, optical, and mechanical properties. However, this requires high detection sensitivity and combined spatial, energy and momentum resolutions, thus has been elusive. Here, we demonstrate a four-dimensional electron energy loss spectroscopy technique, and present position-dependent phonon dispersion measurements in individual boron nitride nanotubes. By scanning the electron beam in real space while monitoring both the energy loss and the momentum transfer, we are able to reveal position- and momentum-dependent lattice vibrations at nanometer scale. Our measurements show that the phonon dispersion of multi-walled nanotubes is locally close to hexagonal-boron nitride crystals. Interestingly, acoustic phonons are sensitive to defect scattering, while optical modes are insensitive to small voids. This work not only provides insights into vibrational properties of boron nitride nanotubes, but also demonstrates potential of the developed technique in nanoscale phonon dispersion measurements.

scholarly journals Synthesis, characterisation and applications of core–shell carbon–hexagonal boron nitride nanotubes

2020 ◽  
Vol 2 (11) ◽  
pp. 4996-5014
Author(s):  
Ruth Sang Jones ◽  
Barbara Maciejewska ◽  
Nicole Grobert
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
Core Shell ◽  
Carbon Core

This review explores the rapidly emerging field of hetero-nanotubes consisting of a carbon core and hexagonal boron nitride shell.

Copper catalyzed growth of hexagonal boron nitride nanotubes on a tungsten substrate

CrystEngComm ◽  
2018 ◽  
Vol 20 (19) ◽  
pp. 2713-2719 ◽  
Author(s):  
Vijayesh Kumar ◽  
Palash Chandra Maity ◽  
Debrupa Lahiri ◽  
Indranil Lahiri
Keyword(s):  
Boron Nitride ◽  
Copper Nanoparticles ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
Metallic Substrate ◽  
Direct Application ◽  
Direct Growth ◽  
Tungsten Substrate

Copper nanoparticles were introduced as the catalyst for the direct growth of BNNTs on a metallic substrate leading to their direct application in electronics.

Sonochemical Functionalization of Boron Nitride Nanomaterials

MRS Advances ◽  
2019 ◽  
Vol 5 (14-15) ◽  
pp. 709-716
Author(s):  
Haley B. Harrison ◽  
Jeffrey R. Alston
Keyword(s):  
Thermal Stability ◽  
Boron Nitride ◽  
Photoelectron Spectroscopy ◽  
Colloidal Stability ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
Covalent Attachment ◽  
Covalent Functionalization ◽  
X Ray ◽  
Ft Ir

AbstractBoron nitride nanotubes (BNNTs) and hexagonal boron nitride platelets (h-BNs) have received considerable attention for aerospace insulation applications due to their exceptional chemical and thermal stability. Presently, making BN nanomaterials compatible with polymer and composite matrices is challenging. Due to their inert and highly stable structure, h-BN and BNNTs are difficult to covalently functionalize. In this work, we present a novel sonochemical technique that enables covalent attachment of fluoroalkoxy substituents to the surface of BN nanomaterials in a controlled and metered process. Covalent functionalization is confirmed via colloidal stability analysis, FT-IR, and x-ray photoelectron spectroscopy (XPS).

Synchrotron Photoluminescence Spectroscopy of Boron Nitride Nanotubes with Different Metal Impurities

2009 ◽  
Vol 1204 ◽  
Author(s):  
Jun Yu ◽  
Ying Ian Chen ◽  
Luhua Li ◽  
Bing-ming Cheng ◽  
Dehong Yu
Keyword(s):  
Electronic Structure ◽  
Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
Photoluminescence Spectroscopy ◽  
Pl Spectra ◽  
Substrate Metal ◽  
Metal Impurities ◽  
Cold Pressed

AbstractIn this paper, the impurity influences of BNNTs on photoluminescence (PL) analysis have been investigated systematically. Similar PL spectra were obtained from bulk disk of the cold-pressed BNNTs and dispersed individual BNNTs deposited on CaF2 substrate. Metal impurities such as Fe and Au do not affect PL emissions of the BNNTs strongly possibly because Au doping creates sever structural damages but do not change the electronic structure.

Ab initio study of the structures and hydrogen storage capacity of (H2)nCH4 compound

2015 ◽  
Vol 29 (13) ◽  
pp. 1550062 ◽  
Author(s):  
Minghui Wang ◽  
Xinlu Cheng ◽  
Dahua Ren ◽  
Hong Zhang ◽  
Yongjian Tang
Keyword(s):  
Boron Nitride ◽  
Hydrogen Storage ◽  
Ab Initio ◽  
Density Functional ◽  
Storage Capacity ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
Hydrogen Storage Capacity ◽  
Practical Applications ◽  
The Stability

The hydrogen-rich compound ( H 2)n CH 4 (for n = 1, 2, 3, 4) or for short ( H 2)n M is one of the most promising hydrogen storage materials. The ( H 2)4 M molecule is the best hydrogen-rich compound among the ( H 2)n M structures and it can reach the hydrogen storage capacity of 50.2 wt.%. However, the ( H 2)n M always requires a certain pressure to remain stable. In this work, we first investigated the binding energy of the different structures in ( H 2)n M and energy barrier of H 2 rotation under different pressures at ambient temperature, applying ab initio methods based on van der Waals density functional (vdW-DF). It was found that at 0 GPa, the ( H 2)n M is not stable, while at 5.8 GPa, the stability of ( H 2)n M strongly depends on its structure. We further investigate the Raman spectra of ( H 2)n M structures at 5.8 GPa and found the results were consistent with experiments. Excitingly, we found that boron nitride nanotubes (BNNTs) and graphite and hexagonal boron nitride ( h - BN ) can be used to store ( H 2)4 M , which give insights into hydrogen storage practical applications.

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