Anomalous Raman signals in multilayer hexagonal boron nitride grown by chemical vapour deposition on metal foil catalysts.

ABSTRACT: Hexagonal boron nitride (hBN), a two-dimensional (2D) wide bandgap material, serves as an ideal insulating substrate and a protection layer for other 2D materials, such as graphene and transition metal dichalcogenides (TMDs). Here, we report for the first time the emergence of an anomalous Raman peak in single-crystal, multilayer pyramidal hBN grains grown on Fe-Ni alloy foil by chemical vapour deposition (CVD). This peak is located near the characteristic E_2g band (1367 cm^-1) and shifts to higher wavenumbers with the increasing number of hBN layers, peaking at ∼1415 cm^-1 at the centre of hBN grains. The appearance of this Raman peak is attributed to a blue shift of the E_2g phonon caused by compressive strain induced during the cooling step in th

SUBMITTER: Okonai T 

PROVIDER: S-EPMC12434615 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature