COLE, Mr Ian Richard LEWIS, Councillor Andrew Ms LEY Councillor Holmes Councillor Mitchell HOLMES, Councillor John Ms LIVERMORE. UNLP (Universidad Nacional de La Plata) – ONG Nuevo Ambiente – La Agencia Ambiental La Plata – Ley Aliados estratégicos. 2s Ley da Annali & Istoriedi Corn. Tacito, tradotte Filli di Sciio di Bonarelli, cum Jig. corio turcico, filiis deaur. zs od.. ib. S
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Defect-originated magnetism in carbon-based and non-traditional inorganic compounds: Figure 9 shows the band structure of pristine and fluorinated 6, 0 BNNTs; new energy levels for both the up and down spin states having relatively small dispersion appear close to the Fermi energy upon the adsorption of F on BNNTs.
The magnitude of the band gap in BNNTs is strongly affected by the nature of B-N hybridization [ 12 ]; the curvature induced hybridization change leads to smaller band gap with the decrease in diameter.
This effect is diameter dependent; a bigger diameter BNNT exhibits a stronger response to the transverse electric field in comparison to a smaller diameter tube [ 21 ].
Magnetism in different metal- free sp materials has been reported recently both theoretically and experimentally [ 4546 ]. Due to their large band gap, BNNTs are also explored as a tunnel magneto resistance device.
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Chemically Activated Boron Nitride Nanotubes. Magnetism in BN nanotubes induced by carbon doping. BNNTs are also being explored for possible application in nanomechanical sensors and actuators. Insets show the schematic junction structures for the P and AP spin configurations. A Schematic diagram of a gold nanoparticle-decorated BNNT based room temperature tunneling field effect transistor.
To address this challenge, SD with nonmagnetic atoms has been explored to induce magnetism in BNNTs [ 4041— ]. For example, the chemisorption of F on BNNT surface changes the sp 2 hybridization at the lsy site to sp 3 [ — ].
Substitutional doping of BN nanotube by transition metal: Besides, F-BNNT has been shown to have high conductivity [ 25 ], which makes it an ideal candidate for a spin filter. Functionalization An alternative approach for tuning the electronic property of BNNTs is surface functionalization with different atoms, molecules, and nanoparticles [ 6164 ].
Nano Au-decorated boron nitride nanotubes: Theoretical study on interaction of hydrogen with single-walled boron nitride nanotubes.
In addition, like CNTs [ — ], BNNTs have also been explored as potential materials for hydrogen storage [ — ]; BN nanotubes have been demonstrated to retain 1. Structure and magnetic properties of adatoms on carbon nanotubes. Doping in BNNTs can be done either by introducing purposefully the foreign atoms during the growth of Lej [ 2526, ] or by replacing the host atoms B or N by foreign atoms after the synthesis of BNNTs [ 27, ], which is 1592 as post-synthesis doping.
For example, the band gap of a BNNT with diameter Both the static magnetism and magneto-transport properties in BNNT junctions are highlighted. For example, SD of carbon in BNNTs has been found to induce strong magnetism with enhanced conductivity [ 40— ]; the antiferromagnetic coupling between local magnetic moments has been found to be the stable configuration in C-doped BNNTs [ ].
Different conjugated molecules, such as poly[ m -phenylenevinylene- co – 2,5-dioctoxy- p -phenylenevinylene ] PmPV [ ] perylene-3,4,9,tetracarboxylic acid tetrapotassium 1392 PTAS [ ], flavin mononucleotides FMN [ 31 ], peptide [ 34 ], poly xylylene tetrahydrothiophenium chloride PXT [ 32 ], poly dodium vinyl sulfonate [ 32 ], and poly p -phenylene-ethynylene s [ ], have been used to make BNNTs soluble in different polar and non-polar solvents through functionalization.
Boron-nitride and boron-carbonitride nanotubes: Collision, storage, and adsorption. It should be noted that band gap modulation and conductivity enhancement upon application of radial strain are being reported in semiconducting CNTs [ 92 — 95 ].
In addition to the band gap modulation, functionalization of BNNTs with different molecules have been shown to disentangle and unbundle the multi-walled BNNTs [ 31 — 34 ], as observed in CNTs 31592 35 — 38 ] and graphene [ 39 ]; this is an important first step toward their practical application. Spin-unrestricted linear-scaling electronic structure theory and its application to magnetic carbon-doped boron nitride nanotubes. Improving spin-filtering efficiency in graphene and boron nitride nanoribbon heterostructure decorated with chromium-ligand.
Selective adsorption of first-row atoms on BN nanotubes. Support Center Support Center. Field emission and strain engineering of electronic properties in boron nitride nanotubes.
The same research group has also functionalized BNNTs covalently with different molecular groups, namely amino and -COCl groups [ ].
Boron Nitride Nanotubes for Spintronics
Nanoparticles functionalization and junction fabrication. Prediction, synthesis, characterizations, and applications. In this regard, the discovery of ferromagnetism in metal-free magnetic materials provides an important opportunity for designing a spin filter [ 30 ]. Young modulus, mechanical and electrical properties of isolated individual and bundled single-walled boron nitride nanotubes.
Electronic and optical properties of pure and doped boron-nitride nanotube. Humidity sensing properties of single Au-decorated boron nitride nanotubes. Structure and mechanical flexibility of carbon nanotube ribbons: Lsy synthesis of boron nitride nanotubes and improved electrical conductivity. This can be done using both covalent and non-covalent functionalization; however, the non-covalent one seems more appropriate since it preserves the intrinsic properties of the BNNTs [ 32 ].
Recent advancements in boron nitride nanotubes. Coherent transport of electron spin in a ferromagnetically contacted carbon nanotube. This suggests that the open-ended BNNT could possibly be used as spin polarized electron field emitters [ 44 ]. Radial deformation and its related energy variations of single-walled carbon nanotubes. Spontaneous polarization and piezoelectricity in boron nitride nanotubes. Defects in Carbon Nanotubes. Considering the experimental progress in recent years, it is expected that the spin filter proposal based on F-BNNT discussed above can be verified.
On the theoretical front, conjugated molecules, such as poly[ m -phenylenevinylene- co – 2,5-dioctyloxy- p -phenylenevinylene ] PmPVpolystyrene PSand polythiophene PT [ ], [ p – 1,1,3,3-tetramethylbutyl phenyl ether Triton X [ ] are also explored for non-covalent functionalization of BNNTs.
Due to these advantages, functionalization of BNNTs has been the subject of intense research over the past few years [ 56164 ].
The change in sign of J is attributed to the electric field-induced modification of magnetic exchange interactions at the interface [ ] see the inset of Figure 10d caused by the Stark effect [ 55 ].
Traditionally, the formation of local magnetic moments in different elements and alloys has been associated with partially filled d and f states of the elements [ 4546— ]; collective magnetism in such materials is the result of coupling between these localized moments.
Microscopic theory for nanotube piezoelectricity.