Abstract
Uniform Ga2O3−C nanocables with an average core diameter of 40 nm, wall thickness of 6 nm, and lengths of up to dozens of μm were generated via co-thermal evaporation of gallium oxide and activated carbon powder. The nanocable formation is discussed based on thermodynamics and crystallography. Gallium oxide and carbon generate gaseous Ga2O and CO at a higher temperature; they then recombine to form Ga2O3 and C. The simultaneous generation of Ga2O3 and C ensures continuous uniform coatings of carbon on gallium oxide nanowires. Field-emission measurements indicated that the nanocables exhibited an unusual sharp increase in emission current density near the threshold field.
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