Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Isotope effect on the thermal expansion coefficient of atomically thin boron nitride

Isotope effect on the thermal expansion coefficient of atomically thin boron nitride Atomically thin monoisotopic hexagonal boron nitride (BN) which is electrically insulating and has a high thermal conductivity could be utilized as fillers in electronic packaging materials for thermal dissipation in integrated and miniaturized modern devices. Thermal expansion mismatch in electronic packaging could cause strain and ultimately device failure, so it is valuable to measure and understand the thermal expansion coefficient (TEC) of atomically thin isotopically pure BN. In this work, we studied the TECs of mono-, bi-, and tri-layer isotope-purified BN using Raman spectroscopy and density functional theory calculations including van der Waals dispersion forces. Monolayer (1L) 10BN had a slightly larger experimental TEC than 1L 11BN at close to room temperature: (−5.1 ± 0.8) × 10−6 K−1 and (−4.6 ± 0.8) × 10−6 K−1, respectively. The negative TECs up to 700 K were attributed to the competition between the in-plane stretching vibration modes and out-of-plane bending modes in BN; the lighter isotope leads to a larger absolute TEC due to higher amplitude of its out-of-plane bending modes. The absolute TECs of isotopic BN decreased with increased atomic thickness, which indicates strengthening of the out-of-plane bending rigidity. The deep understanding of the isotope effect on the TEC of two-dimensional (2D) materials also opens a promising pathway to minimize TEC mismatch in 2D van der Waals heterostructures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png 2D Materials IOP Publishing

Isotope effect on the thermal expansion coefficient of atomically thin boron nitride

Loading next page...
 
/lp/iop-publishing/isotope-effect-on-the-thermal-expansion-coefficient-of-atomically-thin-MoAGRxWU5d

References

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
IOP Publishing
Copyright
© 2021 IOP Publishing Ltd
eISSN
2053-1583
DOI
10.1088/2053-1583/ac0730
Publisher site
See Article on Publisher Site

Abstract

Atomically thin monoisotopic hexagonal boron nitride (BN) which is electrically insulating and has a high thermal conductivity could be utilized as fillers in electronic packaging materials for thermal dissipation in integrated and miniaturized modern devices. Thermal expansion mismatch in electronic packaging could cause strain and ultimately device failure, so it is valuable to measure and understand the thermal expansion coefficient (TEC) of atomically thin isotopically pure BN. In this work, we studied the TECs of mono-, bi-, and tri-layer isotope-purified BN using Raman spectroscopy and density functional theory calculations including van der Waals dispersion forces. Monolayer (1L) 10BN had a slightly larger experimental TEC than 1L 11BN at close to room temperature: (−5.1 ± 0.8) × 10−6 K−1 and (−4.6 ± 0.8) × 10−6 K−1, respectively. The negative TECs up to 700 K were attributed to the competition between the in-plane stretching vibration modes and out-of-plane bending modes in BN; the lighter isotope leads to a larger absolute TEC due to higher amplitude of its out-of-plane bending modes. The absolute TECs of isotopic BN decreased with increased atomic thickness, which indicates strengthening of the out-of-plane bending rigidity. The deep understanding of the isotope effect on the TEC of two-dimensional (2D) materials also opens a promising pathway to minimize TEC mismatch in 2D van der Waals heterostructures.

Journal

2D MaterialsIOP Publishing

Published: Jul 1, 2021

Keywords: boron nitride; thermal expansion; isotope effect; two-dimensional materials; Raman spectroscopy

There are no references for this article.