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Communication Dans Un Congrès Année : 2022

Atomic Layer Deposition of Au-TiO2 inverse opals for the visible light photocatalysis of dyes degradation

Résumé

The pollution of waste water due to organic dyes used in the textile and chemical industries is an important environmental issue. Inverse opals (IO) offer a great potential for increasing the efficiency of their degradation by semiconductor photocatalysts such as TiO2 by the synergy of high specific surface and photonic crystal properties [1]. Doping TiO2 with gold nanoparticles is another possible strategy to enhance its photocatalytic activity by increasing its optical absorption in the visible range [2]. This work reports the synthesis of Au-TiO 2 IO films by Atomic Layer Deposition and the study of their visible-light photocatalytic activity for the degradation of methylene blue in water solution compared to pure TiO2 IO and flat Au-TiO2 films. The use of preformed nanoparticles with a narrow size distribution allows to better control their plasmonic properties including light absorption in the visible range. The morphology of Au-TiO 2 IO films and the distribution of Au nanoparticles have been analyzed by scanning electron microscopy (Fig. 1) and nano-SIMS. Their composition and structure have been investigated by XPS and Raman spectroscopy. The degradation kinetics of methylene blue was studied using Au-TiO2 IO films as visible light photocatalysts. Flat Au-TiO2 films were also used for comparison. It has been shown that doping of TiO 2 with gold nanoparticles allows to obtain a faster degradation which reaches about 95 % in 7 hours instead of 90 % after 14 hours with flat films. These results highlight the potential of Au-TiO2 inverse opal films synthesized by ALD for visible light photocatalytic applications. [1] L. Hu et al., Catalysis Communications 40 (2013) 106 – 110. [2] S. W. Verbruggen, J. Photochem. and Photobiology C: Photochem. Reviews 24 (2015) 64 - 82.
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Dates et versions

hal-03878314 , version 1 (29-11-2022)

Identifiants

  • HAL Id : hal-03878314 , version 1

Citer

P. Birnal, M. C. Marco de Lucas, I. Pochard, F. Herbst, Olivier Heintz, et al.. Atomic Layer Deposition of Au-TiO2 inverse opals for the visible light photocatalysis of dyes degradation. 5th International Conference on Applied Surface Science, Apr 2022, Palma De Mallorca, Spain. ⟨hal-03878314⟩
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