TY - JOUR
T1 - Single crystal growth of monoisotopic hexagonal boron nitride from a Fe-Cr flux
AU - Li, Jiahan
AU - Elias, Christine
AU - Ye, Gaihua
AU - Evans, Dylan
AU - Liu, Song
AU - He, Rui
AU - Cassabois, Guillaume
AU - Gil, Bernard
AU - Valvin, Pierre
AU - Liu, Bin
AU - Edgar, James H.
N1 - Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2020/8/7
Y1 - 2020/8/7
N2 - Hexagonal boron nitride (hBN) is an important insulator that is incorporated into numerous 2D electronic, optoelectronic, and photonic devices, whereas natural hBN is a mixture of 20% 10B and 80% 11B isotopes, and monoisotopic hBN is a variant with just a single boron isotope, either 10B or 11B. Consequently, monoisotopic hBN has a higher thermal conductivity and a stronger neutron absorption (in the case of h10BN), making it superior for neutron detectors, heat management materials in nano flexible electronic devices, and phonon polariton-based nanophotonics. Here we synthesized approximately monoisotopic hBN using boron powder containing a single boron isotope and nitrogen, and grew single crystals from a Fe-Cr metal flux at atmospheric pressure. Narrow Raman peaks from the shear (≤1.3 cm-1) and intralayer (≤3.3 cm-1) modes demonstrate that the crystals are highly ordered. In the photoluminescence spectra, the presence of phonon-assistant transition peaks is also indicative of the high-quality of the crystals. This growth protocol permits us to get rid of the emission at 4.1 eV. This work provides a novel material for studying the fundamental properties of isotopic effects and the high-performance hBN device.
AB - Hexagonal boron nitride (hBN) is an important insulator that is incorporated into numerous 2D electronic, optoelectronic, and photonic devices, whereas natural hBN is a mixture of 20% 10B and 80% 11B isotopes, and monoisotopic hBN is a variant with just a single boron isotope, either 10B or 11B. Consequently, monoisotopic hBN has a higher thermal conductivity and a stronger neutron absorption (in the case of h10BN), making it superior for neutron detectors, heat management materials in nano flexible electronic devices, and phonon polariton-based nanophotonics. Here we synthesized approximately monoisotopic hBN using boron powder containing a single boron isotope and nitrogen, and grew single crystals from a Fe-Cr metal flux at atmospheric pressure. Narrow Raman peaks from the shear (≤1.3 cm-1) and intralayer (≤3.3 cm-1) modes demonstrate that the crystals are highly ordered. In the photoluminescence spectra, the presence of phonon-assistant transition peaks is also indicative of the high-quality of the crystals. This growth protocol permits us to get rid of the emission at 4.1 eV. This work provides a novel material for studying the fundamental properties of isotopic effects and the high-performance hBN device.
UR - http://www.scopus.com/inward/record.url?scp=85089490490&partnerID=8YFLogxK
U2 - 10.1039/d0tc02143a
DO - 10.1039/d0tc02143a
M3 - Article
AN - SCOPUS:85089490490
SN - 2050-7534
VL - 8
SP - 9931
EP - 9935
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 29
ER -