Influence of substrate temperature on delafossite CuFeO2 films synthesized by reactive magnetron sputtering

Ziani, N.; Aubry, Eric; Martin, Nicolas; Hirsinger, Laurent; Billard, Alain; Briois, Pascal; Belkaid, Mohammed Saïd; Yazdi, Mohammad Arab Pour

doi:10.1016/j.jallcom.2021.160169

Cited by 13 publications

(2 citation statements)

References 56 publications

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“…This shows the width of the band associated with the disorder. The values are consistent with values reported previously for sputtered delafossite thin films deposited at 380 °C [ 57 ] or in TiO 2 [ 58 ]. It is shown that the disorder values increase when the nanoparticles are introduced in proximity to the surface, in relative agreement with the micro-strain and dislocation evolutions.…”

Section: Resultssupporting

confidence: 92%

One-Step Synthesis of TiO2/SiO2-np Nanocomposite Photocatalytic Multilayer Films: Effect of Incorporation Time Sequences of SiO2 Nanoparticles during the TiO2 Film Growth

Lai,

Aubry,

Sublemontier

et al. 2024

Materials

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In this article, the TiO2/SiO2-np nanocomposite multilayer films were synthesized in a single step by reactive magnetron sputtering combined with a nanoparticle aerosol jet. The SiO2 nanoparticles (SiO2-np) were introduced into a growing TiO2 thin film with different time sequences during deposition for a fixed duration. The SiO2-np acting as impurities are introduced into the TiO2 to willingly disturb its growth and to cause growth defects in order to increase the specific surface area of the photocatalytic film. In reason of the non-photoactive properties of the SiO2 nanoparticles, their introduction allows us to study only the effects induced on the film morphology, microstructure, and photocatalytic properties by their incorporation. The fractographies and topographies reveal strong changes in the morphologies depending on the time sequence of the nanoparticle introduction in the thin films. The introduction of SiO2-np from the beginning of the TiO2 film growth leads to the formation of high and large growth defects resulting in a highly diffusive surface. In addition, XRD analysis shows that the crystallite size tends to decrease as the composite film layer gets closer to the surface. Their photocatalytic performance is obtained by following the degradation of orange G dye under UV-visible irradiation. The photocatalytic performance is not only related to the specific surface area of the catalyst film, and the coverage of the photoactive phase on the surface, but also to the crystal quality of the photoactive phase. Furthermore, the samples exhibit good photostability, maintaining the same activity after four degradation cycles. In the specific case of TiO2/SiO2-np, it is demonstrated that the introduction of the nanoparticles only at the beginning of the film growth is more efficient than a continuous introduction. This result suggests that this original process allows the use of a relevant strategy for the nanoparticle introduction according to the required functionality.

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Section: Resultssupporting

confidence: 92%

One-Step Synthesis of TiO2/SiO2-np Nanocomposite Photocatalytic Multilayer Films: Effect of Incorporation Time Sequences of SiO2 Nanoparticles during the TiO2 Film Growth

Lai,

Aubry,

Sublemontier

et al. 2024

Materials

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“…CuFeO 2 thin film has been considered as a one-size-fits-all electrode in these application devices. It has been synthesized via various deposition techniques such as sputtering [2,[20][21][22], pulsed laser deposition [23][24][25], sol-gel based spin coating [1,26,27], hydrothermal method [19,28], electrodeposition [9,[29][30][31] and spray pyrolysis [3,32,33]. Among these deposition techniques, the electrodeposition is an advantageous method for fabrication of high-quality CuFeO 2 thin film.…”

Section: Introductionmentioning

confidence: 99%

Effect of Deposition Parameters on Morphological and Compositional Characteristics of Electrodeposited CuFeO2 Film

Son

2022

Coatings

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Deposition parameters determine the characteristics of semiconductor films in electrodeposition. Thus, it is essential to understand the effect of deposition parameters on the electrodeposited film for fabricating suitable semiconductor film fitting for various applications. In this work, the morphological and compositional properties of electrodeposited delafossite CuFeO2 film, according to the deposition parameters, were studied. The CuFeO2 film was fabricated by the galvanostatic electrodeposition and post-annealing process under inert gas flow. The type of solvent, electrolyte condition, applied current density and deposition time were controlled as the variable deposition parameters. As a result, the typical CuFeO2 film, without any impurities, was electrodeposited in the electrolyte-based DMSO solvent. Interestingly, the concentration of potassium perchlorate as a complexing agent caused morphological change in electrodeposited CuFeO2 film, as well as compositional transition. On the other hand, the applied current density and deposition time only influenced the morphology of electrodeposited CuFeO2 film. These observations would provide specific guidelines for the fabrication of electrodeposited CuFeO2 film with suitable composition and morphology for various applications.

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Aerosol Deposition of CuFeO2 Photocathode Coatings for Hydrogen Production

Bruera,

Elsenberg,

Borghi

et al. 2024

J Therm Spray Tech

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Photoelectrochemical (PEC) water splitting is a viable route for green hydrogen generation. In PEC cells, the electrodes are coated with suitable semiconductor materials, which absorb the sunlight, generating charge carriers that are used to split water molecules into H2 and O2. CuFeO2 is one promising photocathode material for water splitting. However, its performance is limited by electron/hole pairs recombination within the film and at the film/substrate interface. Aerosol deposition (AD) can be employed to minimize charge recombination by spraying dense, thin films and by establishing a good back-contact interface. In this study, CuFeO2 powders were synthesized through a conventional solid-state technique and sprayed by AD under varied parameter sets. The effect of particle size distributions, carrier gas, gas pressure and substrate temperature was investigated. The best spraying parameter set was then tuned to obtain thin coatings (< 1 µm). Single-particle deformation and coatings microstructure were investigated by scanning electron microscopy. Optical properties of CuFeO2 films were analyzed by UV–Vis spectroscopy, while photoelectrochemical performances were estimated through amperometry tests under simulated sunlight. The results of this research show that CuFeO2 photocathodes can be successfully manufactured by AD. Their performance can be optimized by adjusting coating thickness and by annealing in air.

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Influence of substrate temperature on delafossite CuFeO2 films synthesized by reactive magnetron sputtering

Cited by 13 publications

References 56 publications

One-Step Synthesis of TiO2/SiO2-np Nanocomposite Photocatalytic Multilayer Films: Effect of Incorporation Time Sequences of SiO2 Nanoparticles during the TiO2 Film Growth

One-Step Synthesis of TiO2/SiO2-np Nanocomposite Photocatalytic Multilayer Films: Effect of Incorporation Time Sequences of SiO2 Nanoparticles during the TiO2 Film Growth

Effect of Deposition Parameters on Morphological and Compositional Characteristics of Electrodeposited CuFeO2 Film

Aerosol Deposition of CuFeO2 Photocathode Coatings for Hydrogen Production

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