Handbook of Boron Nanostructures

2016 ◽  
Keyword(s):  
Boron Nanostructures

The Unusually Stable B100Fullerene, Structural Transitions in Boron Nanostructures, and a Comparative Study of α- and γ-Boron and Sheets

2010 ◽  
Vol 114 (10) ◽  
pp. 4362-4375 ◽  
Author(s):  
C. Özdoğan ◽  
S. Mukhopadhyay ◽  
W. Hayami ◽  
Z. B. Güvenç ◽  
R. Pandey ◽  
...  
Keyword(s):  
Comparative Study ◽  
Structural Transitions ◽  
Boron Nanostructures

scholarly journals Hypersonic Impact Properties of Pristine and Hybrid Single and Multi-layer C3N and BC3 Nanosheets

2020 ◽  
Author(s):  
Sadegh Sadeghzadeh ◽  
Kasra Einalipour Eshkalak ◽  
Fatemeh Molaei ◽  
Hossein Siavoshi
Keyword(s):  
2D Materials ◽  
Variable Number ◽  
Dynamics Simulation ◽  
Two Dimensional ◽  
Hypervelocity Impacts ◽  
Absorption Energy ◽  
Ballistic Protection ◽  
Fundamental Understanding ◽  
Ballistic Properties ◽  
Boron Nanostructures

Abstract Two-dimensional (2D) materials are competitive candidates replacing or supplementing conventional semiconductors due to their atomically uniform thickness. To observe and exploit the unique properties of two-dimensional (2D) materials, it is therefore vital to obtain clean and repeatable interfaces. Also, carbon, nitrogen, and boron nanostructures are promising ballistic protection materials due to their low density and excellent mechanical properties. In this study, we evaluated the ballistic properties of C3N and BC3 nanosheets against the hypersonic bullets with Mach number greater than 6. Besides, we created a hybrid sheet using van der Waals bonds between them based on the hypervelocity impacts of fullerene (C60) molecules utilizing molecular dynamics simulation. In the following, the ballistic properties of different structures were examined, and it was shown that C3N nanosheets have higher absorption energy than BC3 after C60 penetration. In contrast, in lower impact speeds and before penetration, single-layers exhibited almost similar behavior. Our findings also reveal that in hybrid structures, the C3N layers will improve the ballistic properties of BC3. The energy absorption values with a variable number of layers and interlayer distance are investigated, for homogeneous or hybrid configurations (stacking of C3N and BC3). In this work, we have discussed two interlayer distances of X = 3.4Å and 4X = 13.6Å for different configurations. These results provide a fundamental understanding of ultra-light multilayered armors' design using nanocomposites based on advanced 2D materials. It can also be used to select and make 2D membranes and allotropes for DNA sequencing and filtration.

scholarly journals Boron nanostructures obtained via ultrasonic irradiation for high performance chemiresistive methane sensors

2020 ◽  
Vol 2 (5) ◽  
pp. 1837-1842
Author(s):  
Ravindra Kumar Jha ◽  
Aman Nanda ◽  
Navakanta Bhat
Keyword(s):  
Gas Sensors ◽  
Ultrasonic Irradiation ◽  
High Performance ◽  
Top Down ◽  
Methane Gas ◽  
Boron Nanostructures

Boron nanostructures obtained via a top-down approach can be efficiently used as the receptor in chemiresistive methane gas sensors.

The investigation of the microstructure and mechanical properties of ordered alominide-iron (boron) nanostructures produced by mechanical alloying and sintering

2012 ◽  
Vol 05 ◽  
pp. 488-495 ◽  
Author(s):  
S. Izadi ◽  
Gh. Akbari ◽  
K. Janghorban ◽  
M. Ghaffari
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Order Parameter ◽  
Fracture Strain ◽  
Sintering Temperature ◽  
Range Order Parameter ◽  
Long Range Order ◽  
X Ray Diffraction ◽  
X Ray ◽  
Boron Nanostructures

In this study, mechanical alloying (MA) of Fe -50 Al , Fe -49.5 Al -1 B , and Fe -47.5 Al -5 B (at.%) alloy powders and mechanical properties of sintered products of the as-milled powders were investigated. X-ray diffraction (XRD) results showed the addition of B caused more crystallite refinement compared to the B -free powders. To consider the sintering and ordering behaviors of the parts produced from cold compaction of the powders milled for 80 h, sintering was conducted at various temperatures. It was found that the sintering temperature has no meaningful effect on the long-range order parameter. The transformation of the disordered solid solution developed by MA to ordered Fe - Al - ( B ) intermetallics was a consequence of sintering. Also, the nano-scale structure of the samples was retained even after sintering. The microhardness of pore-free zones of the nanostructured specimens decreased by increasing the sintering temperature. Moreover, the sintering temperature has no effect on the compressive yield stress. However, the fracture strain increased by increasing the sintering temperature. The samples containing 1 at.% B showed more strain to fracture compared with the B -free and 5 at.% B samples.

Characterization of Nickel Assisted Growth of Boron Nanostructures

2010 ◽  
Vol 4 (1) ◽  
Author(s):  
F. Lagunas ◽  
B. Sorenson ◽  
P. Jash ◽  
M. Trenary
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Thermal Evaporation ◽  
Synthesis Temperature ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Nickel Nanopowder ◽  
Quantitative Analyses ◽  
Boron Nanostructures ◽  
Boron Nanowires

Boron nanostructures were synthesized by the vapor-liquid-solid mechanism using nickel as a catalyst. Two types of catalyst deposition methods were used: thermal evaporation and solution dispersion of Ni nanopowder. Also, the effect of synthesis temperature on the shapes of the nanostrucrure formed is reported here. The nanostructures were primarily characterized by Scanning Electron Microscopy (SEM). Further qualitative analyses were done with Transmission Electron Microscopy (TEM) and High Resolution Transmission Electron Microscopy (HRTEM). For quantitative analyses Energy Dispersive X-ray spectroscopy (EDX) and Electron Energy Loss Spectroscopy (EELS) were used. These results confirmed that 1) high purity Ni assisted boron nanostructures grow by pyrolysis of diborane, and that 2) oxide assisted growth of the nanostructures did not take place as carbon and oxygen were present only as surface contamination. Selected Area Electron Diffraction (SAED) patterns showed that the nanostructures were mainly crystalline. By decreasing the amount of nickel catalyst that is deposited by thermal evaporation the diameters of the nanowires were reduced. Also, the use of nickel nanopowder as catalyst instead of Ni film resulted in significant reduction in wire diameter. The diameter of the boron nanowires are about 36 nm. With nanowires other types of nanostructures were formed in either type of deposition. At the lower reaction temperature formation of nanosheets was observed.

A facile synthesis of boron nanostructures and investigation of their catalytic activity for thermal decomposition of ammonium perchlorate particles

2017 ◽  
Vol 131 (2) ◽  
pp. 925-935 ◽  
Author(s):  
Seyed Ghorban Hosseini ◽  
Mohammad Ali Zarei ◽  
Seyed Jafar Hosseini Toloti ◽  
Hamid Kardan ◽  
Mohammad Amin Alavi
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Ammonium Perchlorate ◽  
Facile Synthesis ◽  
Boron Nanostructures

scholarly journals Proton Migration on the Boron Sheets Surface

2021 ◽  
pp. 19-28
Author(s):  
Evgeniya Boroznina ◽  
◽  
Konstantin Smirnov ◽  
Vladimir Akatiev ◽  
Marina Kudinova ◽  
...  
Keyword(s):  
Band Gap ◽  
Two Dimensional ◽  
Electronic Density ◽  
New Class ◽  
Single Proton ◽  
Mechanical And Electrical Properties ◽  
Type Layer ◽  
Boron Sheets ◽  
Proton Migration ◽  
Boron Nanostructures

Borophene is a two-dimensional allotrope of boron and it is also known as boron sheet. First it has been predicted theoretically in the mid-1990s, experimentally borophene was confirmed in 2015 when the structure was successfully synthesized in 2015. One of the key features of borophene is its strong anisotropy – the dependence of mechanical and electrical properties on direction. This phenomenon is not typical for 2D materials and has never been observed in 2D metals before. Borophene has the highest tensile strength of all known two-dimensional materials. In early works, it was found that the adsorption of a hydrogen atom on the surface of borophene is possible and the analyses of electronic density showed that atom H became a proton. Therefore, in this work, the authors have studied the proton migration over the surface of boron sheets of two types and have found the most energetically favorable path of proton motion. The electron-energy characteristics of the process of migration of a single proton along the surface of boron layers of two types are determined and it is established that in all the considered cases the proton is able to move along the surface almost barrier-free. The type of conductivity of pure boron layers and layers modified by a single proton is determined. In the A-type boron layer, the proton increases the band gap by 0.04 eV, and in the B-type layer, the band gap changes by 0.05 eV. It is proved that two-dimensional boron nanostructures can be considered as a new class of boron topological structure with proton conductivity.

Sign in / Sign up

Export Citation Format

Share Document