TY - JOUR
T1 - Synthesis of borophane polymorphs through hydrogenation of borophene
AU - Li, Qiucheng
AU - Kolluru, Venkata Surya Chaitanya
AU - Rahn, Matthew S.
AU - Schwenker, Eric
AU - Li, Shaowei
AU - Hennig, Richard G.
AU - Darancet, Pierre
AU - Chan, Maria K.Y.
AU - Hersam, Mark C.
N1 - Publisher Copyright:
Copyright © 2021 The Authors,
PY - 2021/3/12
Y1 - 2021/3/12
N2 - Synthetic two-dimensional polymorphs of boron, or borophene, have attracted attention because of their anisotropic metallicity, correlated-electron phenomena, and diverse superlattice structures. Although borophene heterostructures have been realized, ordered chemical modification of borophene has not yet been reported. Here, we synthesize “borophane” polymorphs by hydrogenating borophene with atomic hydrogen in ultrahigh vacuum. Through atomic-scale imaging, spectroscopy, and first-principles calculations, the most prevalent borophane polymorph is shown to possess a combination of two-center–two-electron boron-hydrogen and three-center–two-electron boron-hydrogen-boron bonds. Borophane polymorphs are metallic with modified local work functions and can be reversibly returned to pristine borophene through thermal desorption of hydrogen. Hydrogenation also provides chemical passivation because borophane reduces oxidation rates by more than two orders of magnitude after ambient exposure.
AB - Synthetic two-dimensional polymorphs of boron, or borophene, have attracted attention because of their anisotropic metallicity, correlated-electron phenomena, and diverse superlattice structures. Although borophene heterostructures have been realized, ordered chemical modification of borophene has not yet been reported. Here, we synthesize “borophane” polymorphs by hydrogenating borophene with atomic hydrogen in ultrahigh vacuum. Through atomic-scale imaging, spectroscopy, and first-principles calculations, the most prevalent borophane polymorph is shown to possess a combination of two-center–two-electron boron-hydrogen and three-center–two-electron boron-hydrogen-boron bonds. Borophane polymorphs are metallic with modified local work functions and can be reversibly returned to pristine borophene through thermal desorption of hydrogen. Hydrogenation also provides chemical passivation because borophane reduces oxidation rates by more than two orders of magnitude after ambient exposure.
UR - http://www.scopus.com/inward/record.url?scp=85102595101&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85102595101&partnerID=8YFLogxK
U2 - 10.1126/science.abg1874
DO - 10.1126/science.abg1874
M3 - Article
C2 - 33707261
AN - SCOPUS:85102595101
VL - 371
SP - 1143
EP - 1148
JO - Science
JF - Science
SN - 0036-8075
IS - 6534
ER -