Effect of starting properties and annealing on photocatalytic activity of ZnO nanoparticles

Liu, Fangzhou1; Guo, Mu Yao1; Leung, Yu Hang1; Djurisic, Aleksandra B.1; Alan Man Ching Ng1,2; Chan, Wai Kin3

2013-10-15

10.1016/j.apsusc.2013.07.043

APPLIED SURFACE SCIENCE   影响因子和分区

0169-4332

1873-5584

Eight commercial ZnO samples were investigated, as-received and after annealing in the flow of oxygen or forming gas. We found that ZnO nanoparticles with higher photoluminescence (PL) intensity (fewer nonradiative defects) exhibited a high photocatalytic activity. Samples exhibiting high PL intensity presented lower concentrations of surface adsorbates, which is consistent with lower native defect density in those samples. It was observed that annealing did not result in an improvement in photocatalytic activity of the samples with low defect density (high PL intensity). For the samples with low PL intensity, the same annealing condition could result in an improvement or worsening of photocatalytic activity, depending on the starting properties of the samples. Variable effects of annealing on samples with different properties indicate that the effect of a post-growth treatment cannot be generalized for all ZnO samples. The improvements in the photocatalytic activity were observed for a cationic dye methylene blue, while for an anionic dye acid red 27 annealing resulted in the changes in the amount of adsorbed dye, but no improvement in the photocatalytic activity for dye degradation. (C) 2013 Elsevier B.V. All rights reserved.

Photocatalyis ZnO Nanoparticles Photoluminescence Defects

SCI ; EI

英语

其他

project RGC CRF[CityU6/CRF/08]

Chemistry ; Materials Science ; Physics

Chemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter

WOS:000323601700130

ELSEVIER SCIENCE BV

20133616697762

Annealing ; Aromatic compounds ; Azo dyes ; Defect density ; Defects ; Dyes ; II-VI semiconductors ; Metal nanoparticles ; Nanoparticles ; Photoluminescence ; Zinc oxide ; ZnO nanoparticles

Heat Treatment Processes:537.1 ; Light/Optics:741.1 ; Nanotechnology:761 ; Chemical Agents and Basic Industrial Chemicals:803 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Crystalline Solids:933.1 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
2.South Univ Sci & Technol China, Dept Phys, Shenzhen, Peoples R China
3.Univ Hong Kong, Dept Chem, Hong Kong, Hong Kong, Peoples R China

Liu, Fangzhou,Guo, Mu Yao,Leung, Yu Hang,et al. Effect of starting properties and annealing on photocatalytic activity of ZnO nanoparticles[J]. APPLIED SURFACE SCIENCE,2013,283:914-923.

Liu, Fangzhou,Guo, Mu Yao,Leung, Yu Hang,Djurisic, Aleksandra B.,Alan Man Ching Ng,&Chan, Wai Kin.(2013).Effect of starting properties and annealing on photocatalytic activity of ZnO nanoparticles.APPLIED SURFACE SCIENCE,283,914-923.

Liu, Fangzhou,et al."Effect of starting properties and annealing on photocatalytic activity of ZnO nanoparticles".APPLIED SURFACE SCIENCE 283(2013):914-923.