Optical absorption of boron nitride nanomaterials

Abstract

Optical absorption spectra have been measured for hexagonal boron nitride (h ‐BN), rhombohedral BN (rh ‐BN), and material obtained by laser vaporization of BN target under a nitrogen atmosphere and contained single‐wall BN‐nanotubes. Band gap of the BN materials was found to have a value of 6.0‐6.3 eV. The spectra of h ‐BN and vaporized material exhibited a peak at ∼5.5 eV, moreover, the latter sample showed an absorption band around 4.5 eV. The vaporized material has been fractionated to the BN‐platelets and single‐wall BN‐nanotubes. Absorption peaks, located bellow the bottom of the conductance band, were found to be characteristics of thin BN‐platelets and they could be attributed to defects in BN network. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Hexagonal Boron Nitride Tunnel Barriers Grown on Graphite by High Temperature Molecular Beam Epitaxy

“…The absorption coefficient α ( E ) can be calculated as a function of photon energy, E , from the optical constants and, as shown in the inset of Fig. 2(e) , is characterized by a sharp absorption edge at ~6 eV with no lower energy absorption bands resulting from point defects such as N vacancies and C incorporation 39 44 , indicative of a layer with low defect density. Recently, it was reported that hBN is in fact an indirect bandgap semiconductor and the interband optical transition is phonon-assisted 45 .…”

Electronic and Optical Properties of Boron Nitride Nanostructures Obtained by Laser Vaporization Method

“…Moreover, the optical absorption bands with the same energies were observed in the spectrum of thin BN platelets16 …”

BN as a Saturable Absorber for a Passively Mode‐Locked 2 µm Solid‐State Laser

“…Compared to novel materials such as graphene, BP, and TMDCs, BN, is a traditional 2D nano‐sheet material with a band gap of 0.3–6 eV. BN has been a highly attractive material in various fields for many years as a result of its properties which include low abrasion, fire resistance, a low dielectric constant, low dielectric loss, high thermal conductivity, and resistance to corrosion and oxidation . However, the optical characteristics of BN have not been fully reported, with only some studies investigating the optical absorption from the BN material.…”

“…BN has been a highly attractive material in various fields for many years as a result of its properties which include low abrasion, fire resistance, a low dielectric constant, low dielectric loss, high thermal conductivity, and resistance to corrosion and oxidation. [26][27][28][29] However, the optical characteristics of BN have not been fully reported, with only some studies investigating the optical absorption from the BN material. Currently, there is no published report on the preparation and application of a BN-based SA for mode-locked lasers.…”