Low thermal conductivity of 2D borocarbonitride nanosheets
| Autor: | C. N. R. Rao, Subhajit Roychowdhury, Rohit Attri, Kanishka Biswas |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Inorganic Chemistry symbols.namesake chemistry.chemical_compound Thermal conductivity X-ray photoelectron spectroscopy law Thermoelectric effect Materials Chemistry Physical and Theoretical Chemistry Phonon scattering Graphene 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials Chemical engineering chemistry Boron nitride Ceramics and Composites symbols Grain boundary 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Solid State Chemistry. 282:121105 |
| ISSN: | 0022-4596 |
| Popis: | Two-dimensional (2D) borocarbonitrides (BCN) are of interest since their electrical and optical properties can be tuned for renewable energy applications. Although there have been theoretical studies, experimental studies of the thermal transport and thermoelectric properties of BCN nanosheets have not yet been explored. We have synthesized few-layer BCN nanosheets of different compositions, and characterized them by Raman spectroscopy, X-ray photoelectron spectroscopy and transmission electron microscopy (TEM). They exhibit p-type semiconducting thermoelectric transport properties in 300–573 K range. More interestingly, the BCN nanosheets exhibit low thermal conductivity (0.58–1.86 W/mK) unlike boron nitride (h-BN) and graphene over the temperature range of 300–573 K. The low thermal conductivity of BCN nanosheets arises due to significant phonon scattering by the different length scale hierarchical nano/meso architectures such as bonding heterogeneity (e.g. C–B, C–N and B–N), point defects related C/B/N disorder, nanodomains of BN/carbon and grain boundaries. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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