期刊
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
卷 8, 期 -, 页码 1080-1093出版社
BEILSTEIN-INSTITUT
DOI: 10.3762/bjnano.8.110
关键词
heterojunction; photocatalysis; quantum dots; reactive oxygen species; singlet oxygen; ZCIS quantum dots; ZnO
资金
- Agence Nationale pour la Recherche (ANR) [CD2I 2013]
Alloyed CuInZnxS2+x (ZCIS) quantum dots (QDs) were successfully associated to ZnO nanoparticles by a thermal treatment at 400 degrees 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 approximate to 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 1O(2) 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.
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