Resumo

HAMMAMI, Zaineb et al. Manganese doping effect on Zn0 photocatalytic and electric properties. S.Afr.j.chem. (Online) [online]. 2024, vol.78, pp.27-35. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2024/v78a05.

Mn-doped ZnO nanocrystals with Mn content varying from 0 to 5 at% were successfully synthesized via a simple hydrothermal method. The structural, morphological, and optical properties of the as prepared nanostructures were investigated. The photocatalytic activities of these materials were evaluated by determining the extent of the degradation reaction yield of an organic dye, methyl orange (MO) in an aqueous solution under UV light irradiation. The photodegradation efficiency of MO reached 91% in 180 min for pure ZnO, while all Mn- doped samples showed lower photocatalytic activity according to the following sequence: Zn₀₉₅Mn₀₀₅O < Zn₀₉₉Mn₀₀₁O < Zn₀₉₇Mn₀₀₃O < ZnO. Photocurrent measurements showed that the photocurrent density of ZnO was higher to that of Zn_0.97Mn_0.03O. In addition, impedance spectroscopy was used to investigate the electrical properties of ZnO and Zn₀₉₇Mn₀₀₃O at different temperatures (373-773 K) and various frequencies (10 Hz-13 MHz). The photocurrent density measurements and the explored electrical properties of ZnO and Zn₀₉₇Mn₀₀₃O revealed good accordance with the reduced photocatalytic activity of Zn₀₉₇Mn₀₀₃O nanocrystals.

Palavras-chave : ZnO; Mn doping; Photocatalysis; Photocurrent; Electrical conductivity.

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