Raman Spectroscopic Studies of Monoclinic Gallium Oxide (-Ga₂O₃) Nanostructures: A Comparison Between Nanowires and Nanobelts

Monoclinic gallium oxide (-Ga₂O₃) wires and belts were synthesized via thermal evaporation process by using Ga metallic ignots and -Ga₂O₃ powder as source materials for belts and wires, respectively. The structural and optical properties of the as grown structures were characterized by using SEM, XRD, EDS, room-temperature photoluminescence (PL) and cathodoluminescence (CL) measurements. Raman studies were also performed for the grown structures and Raman shifts were compared with the LDA calculated values of the peaks as well as with their bulk counterpart which exhibited good agreements with most of the peaks for both the structures. It is also observed that the Raman active modes are blueshifted towards higher wavenumber side which may be the characteristics of the nanostructures as they have larger surface to volume ratio compared to their bulk counterparts.