Abstract
We first report a facile hydrothermal method to synthesize Ca doped 3R-CuFeO2 nanoplates with 100⿿400ÿ15⿿40nm2 at 100°C for 24h. The Ca dopants have a significant effect on the crystal structure of CuFeO2, as our investigation shows clearly that the Ca2+ ions were successfully doped into the CuFeO2 lattice and substituted Cu+ ion, resulting in the formation of Cu1-2xCaxFeO2 solid solution of a rhombohedral 3R structure. Furthermore, the calculated direct bandgap energies of (Ca doped) CuFeO2 nanoplates were estimated to be 3.20⿿3.40eV, and the optical bandgaps decreased with increasing concentration of Ca dopant. The mott-schottky anaylsis results indicated that (Ca doped) CuFeO2 nanoplates have a p-type semiconductor behavior, and the carrier density of these CuFeO2 based nanoplates around 1020cm⿿3, which also decreased with increasing concentration of Ca dopant due to the Ca2+ ion replacement of a part of Cu+ ions.
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