Oxygen impact on the electronic and vibrational properties of black phosphorus probed by synchrotron infrared nanospectroscopy

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dc.contributor.authorGrasseschi D.
dc.contributor.authorBahamon D.A.
dc.contributor.authorMaia F.C.B.
dc.contributor.authorCastro Neto A.H.
dc.contributor.authorFreitas R.O.
dc.contributor.authorDe Matos C.J.S.
dc.date.accessioned2024-03-13T00:48:46Z
dc.date.available2024-03-13T00:48:46Z
dc.date.issued2017
dc.description.abstract© 2017 IOP Publishing Ltd.Black phosphorus (BP) is a layered crystalline structure presenting a thickness-tunable direct bandgap and a high charge carrier mobility, with, therefore, enormous interest to photonics, optoelectronics and electronics. However, BP’s high susceptibility to oxidation when exposed to ambient conditions is a critical challenge for its implementation into functional systems. Here, we investigate the degradation of BP flakes exposed to various environmental conditions by synchrotron infrared nanospectroscopy (SINS). As a near-field based technique, SINS provides sub-diffractional mid-infrared images and spectra from nano-sized domains. Supported by density functional theory (DFT) calculations, our SINS spectra reveal the formation of nanoscale POx domains, with x between 0.5 and 1, and a 100 meV red shift in the bandgap of flakes exposed to air for a few minutes. On the other hand, exposure to air for 24 h led to the preferential formation of H3PO4, with complete removal of the electronic transitions from the mid-infrared spectral window, while a long (1 month) exposure to low O2 levels mainly led to the formation of P4O8 and P4O9 species. The SINS analysis allows correlating the morphology of oxidized samples to the oxide type, thus, contributing to a comprehensive characterization of the BP degradation process.
dc.description.issuenumber3
dc.description.volume4
dc.identifier.doi10.1088/2053-1583/aa8210
dc.identifier.issn2053-1583
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35724
dc.relation.ispartof2D Materials
dc.rightsAcesso Restrito
dc.subject.otherlanguageBlack phosphorus
dc.subject.otherlanguageDFT
dc.subject.otherlanguageInfrared nanospectroscopy
dc.subject.otherlanguageSNOM
dc.subject.otherlanguageTight binding
dc.titleOxygen impact on the electronic and vibrational properties of black phosphorus probed by synchrotron infrared nanospectroscopy
dc.typeArtigo
local.scopus.citations18
local.scopus.eid2-s2.0-85029168444
local.scopus.subjectCritical challenges
local.scopus.subjectDegradation process
local.scopus.subjectElectronic transition
local.scopus.subjectEnvironmental conditions
local.scopus.subjectFunctional systems
local.scopus.subjectLayered crystalline
local.scopus.subjectTight binding
local.scopus.subjectVibrational properties
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85029168444&origin=inward
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