ZnO nanoparticles sensitized by CuInZn x S2+x quantum dots as highly efficient solar light driven photocatalysts.
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Date publication
janvier 2017
Journal
Beilstein journal of nanotechnology
Auteurs
Membres identifiés du Cancéropôle Est :
Pr SCHNEIDER Raphaël, Pr ALEM-MARCHAND Halima
Tous les auteurs :
Donat F, Corbel S, Alem H, Pontvianne S, Balan L, Medjahdi G, Schneider R
Lien Pubmed
Résumé
Alloyed CuInZn x S2+x (ZCIS) quantum dots (QDs) were successfully associated to ZnO nanoparticles by a thermal treatment at 400 °C for 15 min. The ZnO/ZCIS composite was characterized by TEM, SEM, XRD, XPS and UV-vis absorption spectroscopy. ZCIS QDs, with an average diameter of ≈4.5 nm, were found to be homogeneously distributed at the surface of ZnO nanoparticles. ZCIS-sensitized ZnO nanoparticles exhibit a high photocatalytic activity under simulated solar light irradiation for the degradation of Orange II dye (>95% degradation after 180 min of irradiation at an intensity of 5 mW/cm(2)). The heterojunction built between the ZnO nanoparticle and ZCIS QDs not only extends the light adsorption range by the photocatalyst but also acts to decrease electron/hole recombination. Interestingly, the ZnO/ZCIS composite was found to produce increased amounts of H2O2 and singlet oxygen (1)O2 compared to ZnO, suggesting that these reactive oxygen species play a key role in the photodegradation mechanism. The activity of the ZnO/ZCIS composite is retained at over 90% of its original value after ten successive photocatalytic runs, indicating its high stability and its potential for practical photocatalytic applications.
Référence
Beilstein J Nanotechnol. 2017 ;8:1080-1093