X-ray Excited Optical Luminescence from Hexagonal Boron Nitride Nanotubes: Electronic Structures and the Role of Oxygen Impurities

ACS Nano ◽  
2010 ◽  
Vol 5 (1) ◽  
pp. 631-639 ◽  
Author(s):  
Lijia Liu ◽  
Tsun-Kong Sham ◽  
Weiqiang Han ◽  
Chunyi Zhi ◽  
Yoshio Bando
Keyword(s):  
Boron Nitride ◽  
Electronic Structures ◽  
Hexagonal Boron Nitride ◽  
Boron Nitride Nanotubes ◽  
X Ray ◽  
Optical Luminescence ◽  
Oxygen Impurities

scholarly journals AB-stacked nanosheet-based hexagonal boron nitride

2021 ◽  
Vol 77 (2) ◽  
Author(s):  
Jae-Kap Lee ◽  
Jin-Gyu Kim ◽  
K. P. S. S. Hembram ◽  
Seunggun Yu ◽  
Sang-Gil Lee
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Metastable Phase ◽  
Stacking Sequence ◽  
Lateral Growth ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Crystalline Growth

Hexagonal boron nitride (h-BN) has been generally interpreted as having an AA stacking sequence. Evidence is presented in this article indicating that typical commercial h-BN platelets (∼10–500 nm in thickness) exhibit stacks of parallel nanosheets (∼10 nm in thickness) predominantly in the AB sequence. The AB-stacked nanosheet occurs as a metastable phase of h-BN resulting from the preferred texture and lateral growth of armchair (110) planes. It appears as an independent nanosheet or unit for h-BN platelets. The analysis is supported by simulation of thin AB films (2–20 layers), which explains the unique X-ray diffraction pattern of h-BN. With this analysis and the role of pressure in commercial high-pressure high-temperature sintering (driving nucleation and parallelizing the in-plane crystalline growth of the nuclei), a growth mechanism is proposed for 2D h-BN (on a substrate) as `substrate-induced 2D growth', where the substrate plays the role of pressure.

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).

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.

Role of size of hexagonal boron nitride particles on tribo-performance of nano and micro oils

2018 ◽  
Vol 30 (8) ◽  
pp. 441-456 ◽  
Author(s):  
Manoj Kumar Gupta ◽  
Jayashree Bijwe ◽  
Meghashree Padhan
Keyword(s):  
Boron Nitride ◽  
Hexagonal Boron Nitride

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.

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.

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.

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