Synthesis and characterization of gallium oxide nanowires via a hydrothermal method

CL study of blue and UV emissions in β-Ga2O3 nanowires grown by thermal evaporation of GaN

“…6(f)), an effect that is more pronounced in sample 4 at the same temperature and before the annealing treatment. The b-Ga 2 O 3 blue emission has been reported by several authors 7,15,16 and has been attributed to a donoracceptor transition, between neutral oxygen vacancies (V O x ) as donor, and oxygen-gallium vacancies pair (V O , V Ga ) as acceptor. 9,13 CL spectra acquired at 90 K from samples 3 and 4 show a blue-shift of 150 meV and 470 meV, respectively (Figs.…”

“…Particularly, the growth of b-Ga 2 O 3 nanowires has been reported by thermal evaporation, 5 arc-discharge, 6 the hydrothermal method, and metal-organic chemical vapor deposition (MOCVD). 7,8 However, b-Ga 2 O 3 has shown undesired emissions due to the presence of impurities or point defects generated by still unclear mechanisms that must be elucidated. Perhaps the most well-known defect related emission attributed to oxygen vacancies is the blue band centered between 2.6 and 2.9 eV, with a relative peak intensity dependent on the growth method used.…”

Synthesis of self-assembled α-GaOOH microrods and 3D hierarchical architectures with flower like morphology and their conversion to α-Ga2O3

“…Metal oxyhydroxides are useful in the fields of catalysis, adsorption, electrochemistry and fluorescence materials [2][3][4][5]. A pioneering work made by Tas et al [6] on the synthesis of zeppelin and rod like GaOOH nano crystals was followed by several publications introducing different synthetic procedures [7][8][9][10][11][12][13][14][15][16][17]. However, reports on simple phase selective synthesis of GaOOH without using any templates or surfactants are scarce.…”

Influence of the Nanostructure of Gallium Oxide Catalysts on Conversion in the Green Synthesis of Carbamates

“…Ga 2 O 3 nanostructures have a high surface area-to-volume ratio. There are several synthetic approaches to prepare these nanostructures such as laser ablation [20,21], molecular beam epitaxy [22], chemical vapor deposition [23][24][25], hydrothermal treatment [26][27][28][29] and plasma-assisted growth methods [30]. Ga 2 O 3 synthesis, in the liquid phase, is usually preceded by GaOOH formation that leads, finally, to Ga 2 O 3 crystals.…”

“…α-Ga 2 O 3 exists at temperatures below 300 • C while γ-Ga 2 O 3 is stable at temperatures between 300 • C and 800 • C. Above 800 • C, only the β-form is found. All other polymorphs of Ga 2 O 3 get converted to the β-form above 800 • C [28]. The β-Ga 2 O 3…”