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Interest of Gas Phase Processes for the Synthesis of Materials Activated under Light: Example in Photocatalysis and Photovoltaics

N Herlin Boime 1 S Ngo 2 S. Bouhadoun 1 R Belchi 1 A Habert 1 F Dapozze 2 J Bouclé 3 C Guillard 2
1 LEDNA - Laboratoire Edifices Nanométriques
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : Due to its high activity under near UV illumination, one of the most studied materials in photocatalytic as well as in photovoltaic studies is titanium dioxide TiO$_2$ especially in its anatase crystalline form. In both cases, one of the phenomena limiting the efficiency is the recombination of electron-holes pair. In this context, the use of composites based on TiO$_2$ nanoparticles and carbon or metallic nano-objects is a relevant strategy towards more efficient electron transfer processes. This paper will present the one-step synthesis of such nanocomposites and some studies on their photocatalytic or photovoltaic applications. To achieve the synthesis of high quality nanocomposites presenting well-controlled physical properties, we use the laser pyrolysis method. This method is based on the interaction between a high power CO2 laser and a gaseous or liquid precursor. In all cases Titanium tetraisopropoxide (TTIP) was used as the TiO$_2$ precursor. Hydrogen tetrachloroaurate was dissolved in the TTIP solution to produce Au loaded TiO$_2$ nanoparticles (Figure 1, left). The efficiency of these nanoparticles was studied under air and N$_2$ for the photocatalytic decomposition of acetic acid. Graphene nanoparticles were dispersed in liquid TTIP to produce composite nanoparticles where TiO$_2$ is grown at the surface of the graphene layers (Figure 1, right). These composite nanoparticles were used to form the porous layer of a perovskite solar cell. In both cases, a significant effect is observed by comparison to the performances obtained from pure TiO$_2$
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https://hal-cea.archives-ouvertes.fr/cea-02341307
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N Herlin Boime, S Ngo, S. Bouhadoun, R Belchi, A Habert, et al.. Interest of Gas Phase Processes for the Synthesis of Materials Activated under Light: Example in Photocatalysis and Photovoltaics. SPASEC22, Nov 2017, Clearwater Beach, United States. ⟨cea-02341307⟩

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