Growth and Redox Properties of Boron on Al(111) : Competing Affinities in the Case of Honeycomb AlB2

The complexity of the geometric and electronic structure of boron allotropes is associated with the multicentric bonding character and the consequent B polymorphism. When growth is limited to two-dimensions (2D), the structural and electronic confinement yields the borophenes family, where the interaction with the templating substrate actually determines the stability of inequivalent boron phases. We report here a detailed study of the growth of the honeycomb AlB2 phase on Al(111), followed by an investigation of its oxidation and reduction properties. By means of a combined experimental and theoretical approach, we show that the structure of the B/Al interface is affected by the complex interplay between B, Al, and common reactive agents like oxygen and hydrogen. While kinetic effects associated with diffusion and strain release influence the AlB2 growth in vacuo, Al, B, O, and H chemical affinities determine its redox behavior. Reduction with atomic hydrogen involves the B layer and yields an ordered honeycomb borophane H/AlB2 phase. Instead, oxidation takes place at the Al interface, giving origin to buried and 1D surface aluminum oxide phases.

Safari, MandanaInternational School For Advanced Studies (sissa/isas) (author)
Ghidorsi, ElenaUniversity of Trieste (author)
Baronio, StefaniaUniversity of Trieste (author)
Scardamaglia, MattiaLund University,Lunds universitet,MAX IV, APXPS,MAX IV, Spektroskopi II,MAX IV, Vetenskapsavdelning,MAX IV-laboratoriet,MAX IV, APXPS,MAX IV, Spectroscopy II,MAX IV, Science division,MAX IV Laboratory(Swepub:lu)ma6236sc (author)
Preobrajenski, Alexei B.Lund University,Lunds universitet,MAX IV, SMS,MAX IV, Spektroskopi I,MAX IV, Vetenskapsavdelning,MAX IV-laboratoriet,MAX IV, SMS,MAX IV,Spectroscopy I,MAX IV, Science division,MAX IV Laboratory(Swepub:lu)maxl-apr (author)
Vinogradov, Nikolay A.Lund University,Lunds universitet,MAX IV, STM,MAX IV, Imaging,MAX IV, Vetenskapsavdelning,MAX IV-laboratoriet,MAX IV, STM,MAX IV, Imaging,MAX IV, Science division,MAX IV Laboratory(Swepub:lu)maxl-nyv (author)
Sala, AlessandroCNR Istituto Officina dei Materiali (IOM) (author)
Cepek, CinziaCNR Istituto Officina dei Materiali (IOM) (author)
de Gironcoli, StefanoInternational School For Advanced Studies (sissa/isas),CNR Istituto Officina dei Materiali (IOM) (author)
Baroni, StefanoCNR Istituto Officina dei Materiali (IOM),International School For Advanced Studies (sissa/isas) (author)
Vesselli, ErikCNR Istituto Officina dei Materiali (IOM),University of Trieste (author)
University of TriesteInternational School For Advanced Studies (sissa/isas) (creator_code:org_t)

By the author/editor: Biasin, Pietro; Safari, Mandana; Ghidorsi, Elena; Baronio, Stefani ...; Scardamaglia, Ma ...; Preobrajenski, A ...; show more...; Vinogradov, Niko ...; Sala, Alessandro; Cepek, Cinzia; de Gironcoli, St ...; Baroni, Stefano; Vesselli, Erik; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Inorganic Chemis ...

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