Isotope effect on the thermal conductivity of boron nitride nanotubes (original) (raw)
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Characterization of thermal transport in low-dimensional boron nitride nanostructures
Physical Review B, 2011
Recent advances in the synthesis of hexagonal boron nitride (BN) based nanostructures, similar to graphene, graphene nanoribbons, and nanotubes, have attracted significant interest into characterization of these materials. While electronic and optical properties of BN-based materials have been widely studied, the thermal transport has not been thoroughly investigated. In this paper, the thermal transport properties of these BN nanostructures are systematically studied using equilibrium molecular dynamics with a Tersoff-type empirical interatomic potential which is re-parametrized to represent experimental structure and phonon dispersion of two-dimensional hexagonal BN. Our simulations show that BN nanostructures have considerably high thermal conductivities but are still quite lower than carbon-based counterparts. Qualitatively, however, the thermal conductivity of carbon and BN nanoribbons display similar behavior with respect to the variation of width and edge structure (zigzag and armchair). Additionally, thermal conductivities of (10,10) and (10,0) nanotubes, both carbon and BN, are found to have very weak dependence on their chirality.
Influence of disorder on thermal transport properties of boron nitride nanostructures
Physical Review B, 2012
The impact of isotopes on thermal transport in boron nitride nanotubes (BNNTs) and boron nitride white graphene is systematically studied via molecular dynamic simulations. By varying the concentration of the 10 B isotope in these materials, we find that thermal conductivity ranges from 340 to 500 W/m −1 K −1 , closely agreeing with experimental observations for isotopically pure and natural (19.9% 10 B) BNNTs. Further, we investigate the interplay between dimension and isotope disorder in several C-based materials. Our results show a general trend of decreasing influence of isotope disorder with dimension of these materials.
Anisotropic thermal transport in bulk hexagonal boron nitride
Hexagonal boron nitride (h-BN) has received great interest in recent years as a wide bandgap analog of graphene-derived systems, along with its potential in a wide range of applications, for example, as the dielectric layer for graphene devices. However, the thermal transport properties of h-BN, which can be critical for device reliability and functionality, are little studied both experimentally and theoretically. The primary challenge in the experimental measurements of the anisotropic thermal conductivity of h-BN is that typically sample size of h-BN single crystals is too small for conventional measurement techniques, as state-of-the-art technologies synthesize h-BN single crystals with lateral sizes only up to 2.5 mm and thickness up to 200 μm. Recently developed time-domain thermoreflectance (TDTR) techniques are suitable to measure the anisotropic thermal conductivity of such small samples, as it only requires a small area of 50x50 μm 2 for the measurements. Accurate atomisti...
Analysis of Temperature Effect on the Mass Sensing Capabilities of Boron Nitride Nanotubes
Journal of Physics: Conference Series, 2021
In the periodic table, it is mentioned that the closer atoms or just intermediate atoms to Carbon are Boron & Nitrogen. Now Scientists also confirmed that Boron & Nitrogen can form a perfect nanotube structure. Boron Nitride Nanotube (BNNT), possesses a similar tubular nanostructure as carbon nanotube (CNT) but it is composed of the B-N atoms hexagonally. BNNT possesses various properties & its properties can show different-different behavior according to the conditions & environment. Here we are discussing the temperature & its effects on the mass sensing capabilities. Along with this, the various configurations of the BNNT’s are also discussed simultaneously. Due to their superior properties & high effectiveness, these are widely used all over the world.
Thermal Transport Measurements of Individual Multiwalled Nanotubes
Physical Review Letters, 2001
The thermal conductivity and thermoelectric power of a single carbon nanotube were measured using a microfabricated suspended device. The observed thermal conductivity is more than 3000 W͞K m at room temperature, which is 2 orders of magnitude higher than the estimation from previous experiments that used macroscopic mat samples. The temperature dependence of the thermal conductivity of nanotubes exhibits a peak at 320 K due to the onset of umklapp phonon scattering. The measured thermoelectric power shows linear temperature dependence with a value of 80 mV͞K at room temperature.
Bulk Hexagonal Boron Nitride with a Quasi‐Isotropic Thermal Conductivity
Advanced Functional Materials, 2018
Hexagonal boron nitride (BN) is electrically insulating and has a high in-plane thermal conductivity. However, it has a very low cross-plane thermal conductivity which limits its application for efficient heat dissipation. Here, large BN pellets with a quasi-isotropic thermal conductivity are produced from BN nanosheets using a spark plasma sintering (SPS) technique. The BN pellets have the same thermal conductivity from both perpendicular and parallel directions to the pellet surface. The high quasi-isotropic thermal conductivity of the bulk BN is attributed to a quasi-isotropic structure formed during the SPS process in which the charged BN nanosheets form large sheets in all directions under two opposite forces of SPS compression and electric field. The pellet sintered at 2300 °C has a very high cross-section thermal conductivity of 280 W m −1 K −1 (parallel to the SPS pressing direction) and exhibits superior heat dissipation performance due to more efficient heat transfer in the vertical direction.
The Journal of Physical Chemistry C, 2017
Thermal conductivity of individual polyvinyl pyrrolidone (PVP) nanofibers embedding boron nitride nanotube (BNNT) fillers has been measured. The PVP nanofibers were electrospun on suspended micro-devices in order to better understand the effect of BNNT fillers on the thermal conductivity of polymeric nanofibers. Various material characterization methods provided evidences that ketone group in the PVP interacted with the surface of BNNTs via strong intermolecular forces, thereby resulting in an effective heat transfer between the polymer