Crystal structural, optical properties and mott-schottky plots of p-type Ca doped CuFeO 2 nanoplates

Polyvinylpyrrolidone-Assisted Hydrothermal Synthesis of CuCoO2 Nanoplates with Enhanced Oxygen Evolution Reaction Performance

“…", Figure 2a,d,g), and the peaks at binding energy (BE) values of 932.5 and 952.3 eV correspond to Cu 2p 3/2 and Cu 2p 1/2 , respectively, which indicates the monovalent state of copper cation (Cu + ). This result is consistent with previous reports on CuCrO 2 , 63 CuFeO 2 , 53 and CuMnO 2 . 55 Another peak located at 934.3 eV can be ascribed to Cu 3d 3/2 , which is indicative of an oxidation state of +2.…”

Experimental and Computational Exploration of the Dilute Magnetic Delafossite CuAl1-xFexO2 Alloys

“…It shows a monotonic increase past 4 eV with only small features. This spectrum is similar to spectra from recently measured powder [148,149] Comparing the calculated conduction bands for x = 0.0 and x = 1.0 in Figure 6.4 and x = 0.01-0.10 in Figure 6.4, it appears for CuFeO2 (x = 1.0) there are many more closely spaced overlapping conduction bands (overwhelmingly spin down) from 0.8 to 2.1 eV. In absorption measurements, these conduction bands are the final states associated with absorbing electrons and will not be resolved, especially for powders, and the observed increase in absorption with increased energy follows.…”

“…With that in mind, peak A at ~ 1.2 eV is likely due to Cu 2+ /Cu + intervalence transitions associated with mixed oxidation states [147], and peaks C, D, and E are probably due to oxygen vacancies and oxygen interstitials [16]. For completeness, the highest energy feature [148,149], peak G, is probably associated with a transition to one of the higher energy bands shown in Figures 6.4 and 6.5.…”

Revealing the impact of strontium doping on the optical, electronic and electrical properties of nanostructured 2H-CuFeO2 delafossite thin films

“…The Hall coefficient (R H ) measurements indicated the p-type nature of the CuFeO 2 compound, as reported previously. 20,22 The resistivity of the undoped CuFeO 2 thin lm was measured to be 4.95 U cm. An intense decrease in the electrical resistivity was observed at the lower doping percentage, manifesting the effective capability of Sr-doping to increase the conductivity of metal oxides.…”

“… 19 Qiang Gao et al reported Ca-doped CuFeO 2 and the modification of its initial properties. 20 To the best of our knowledge, there are no reports describing tuning the properties of the material CuFeO 2 using strontium either experimentally or through first-principles calculations.…”