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4 article(s) from Medjahdi, Ghouti

Improving magnetic properties of Mn- and Zn-doped core–shell iron oxide nanoparticles by tuning their size

Dounia Louaguef,
Ghouti Medjahdi,
Sébastien Diliberto,
Klaus M. Seemann,
Thomas Gries,
Joelle Bizeau,
Damien Mertz,
Eric Gaffet and
Halima Alem

Beilstein J. Nanotechnol. 2025, 16, 2285–2295, doi:10.3762/bjnano.16.157

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Figure 1: (a) TEM images (bright field) of Zn_0.4Fe_2.6O₄ NPs (40 nm). (b) Size distribution histogram of Zn_0.4...

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Figure 2: (1) TEM images of Zn_0.4Fe_2.6O₄ NPs (bright-field images): 5 nm (a), 10 nm (b), 18 nm (c) and 45 nm ...

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Figure 3: X-ray element mapping images of Zn_0.4Fe_2.6O₄ NPs (45 nm) (a) and Zn_0.4Fe_2.6O₄@MnFe₂O₄ NPs (50 nm) (...

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Figure 4: FTIR spectra of Zn_0.4Fe_2.6O₄ NPs (45 nm in red) and Zn_0.4Fe_2.6O₄@MnFe₂O₄ (50 nm in black).

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Figure 5: (a) Magnetization curves of Zn_0.4Fe_2.6O₄ NPs. (b) Magnetization curves of Zn_0.4Fe_2.6O₄@MnFe₂O₄ NPs....

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Figure 6: (a) SAR values of Zn_0.4Fe_2.6O₄@MnFe₂O₄ NPs according to their different sizes. (b) Heating curves o...

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Published 15 Dec 2025

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CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

Fakher Laatar,
Hatem Moussa,
Halima Alem,
Lavinia Balan,
Emilien Girot,
Ghouti Medjahdi,
Hatem Ezzaouia and
Raphaël Schneider

Beilstein J. Nanotechnol. 2017, 8, 2741–2752, doi:10.3762/bjnano.8.273

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Figure 1: TEM images of (a) TiO₂, (b) CdSe nanorods and (c) the CdSe (2 wt %)/TiO₂ composite. (d) HR-TEM imag...

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Figure 2: X-ray diffraction patterns of (a) CdSe and (b) TiO₂ and CdSe/TiO₂ composites with varying CdSe wt %...

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Figure 3: Raman spectra of TiO₂ and CdSe/TiO₂ composites.

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Figure 4: (a) UV–visible absorption spectra of TiO₂ and CdSe/TiO₂ composites, (b) plots of transformed Kubelk...

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Figure 5: High-resolution XPS spectra of the CdSe (2 wt %)/TiO₂ composite: (a) Cd 3d, where Cd 3d_5/2 (blue) a...

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Figure 6: (a) Photocatalytic activity of TiO₂ and CdSe/TiO₂ composites for the degradation of RhB under simul...

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Figure 7: (a) Effect of the catalyst concentration on the photodegradation efficiency (25, 50 or 100 mg of ph...

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Figure 8: Influence of pH on the degradation of rhodamine B using the CdSe (2 wt %)/TiO₂ photocatalyst.

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Figure 9: (a) UV–visible spectral evolution of rhodamine B as a function of irradiation time using the CdSe (...

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Figure 10: Recycling of the CdSe (2 wt %)/TiO₂ catalyst in the degradation of RhB under simulated solar light ...

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Figure 11: Schematic of the charge separation in the CdSe/TiO₂ photocatalyst under (a) solar light and (b) vis...

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Published 19 Dec 2017

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ZnO nanoparticles sensitized by CuInZn_xS₂₊_x quantum dots as highly efficient solar light driven photocatalysts

Florian Donat,
Serge Corbel,
Halima Alem,
Steve Pontvianne,
Lavinia Balan,
Ghouti Medjahdi and
Raphaël Schneider

Beilstein J. Nanotechnol. 2017, 8, 1080–1093, doi:10.3762/bjnano.8.110

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Figure 1: (a) TEM image of ZCIS QDs and (b) the corresponding size distribution. TEM and HR-TEM images of (c)...

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Figure 2: (a) SEM image of the ZnO/ZCIS composite. Elemental mapping of the ZnO/ZCIS composite heated at 400 ...

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Figure 3: High-resolution XPS spectra of (a) Zn 2p_3/2 and (b) O 1s in ZnO and in the ZnO/ZCIS composite.

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Figure 4: Band structure of ZnO and ZCIS QDs and redox potentials of O₂/O₂^•− and ^•OH/H₂O couples.

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Figure 5: (a) Influence of the Orange II concentration and (b) of the ZnO/ZCIS catalyst loading on the photod...

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Figure 6: (a) Influence of pH and (b) of phosphates and carbonates on the photocatalytic activity of the ZnO/...

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Figure 7: Influence of some transition metal chlorides used at 100 µM concentration on the photocatalytic eff...

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Figure 8: Recyclability of the ZnO/ZCIS photocatalyst.

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Figure 9: Concentration of (a) hydroxyl and (b) superoxide radicals and (c) hydrogen peroxide produced by ZnO...

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Figure 10: (a) Time evolution of SOSG−endoperoxide (SOSG-EP) photoluminescence (PL) intensity upon irradiation...

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Figure 11: (a) Influence of ^•OH, O₂^•−, electron and hole scavengers and (b) influence of ¹O₂ scavengers on the...

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Figure 12: Schematic illustration of the charge transfer process and of the ROS production in the ZnO/ZCIS pho...

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Published 17 May 2017

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High performance Ce-doped ZnO nanorods for sunlight-driven photocatalysis

Bilel Chouchene,
Tahar Ben Chaabane,
Lavinia Balan,
Emilien Girot,
Kevin Mozet,
Ghouti Medjahdi and
Raphaël Schneider

Beilstein J. Nanotechnol. 2016, 7, 1338–1349, doi:10.3762/bjnano.7.125

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Scheme 1: Schematic illustration of the synthesis of the Ce-doped ZnO rods.

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Figure 1: (a) XRD patterns of ZnO and Ce-doped ZnO rods and (b) magnification from 30 to 38°.

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Figure 2: Raman spectra of ZnO and ZnO:Ce rods.

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Figure 3: XPS analysis of the prepared ZnO:Ce (5%) rods. (a) Survey scan, and high resolution scans of (b) Zn...

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Figure 4: Room temperature UV–visible diffuse reflectance spectra of ZnO and Ce-doped ZnO rods.

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Figure 5: TEM images of (a) ZnO rods and (b–f) ZnO rods doped with 1, 3, 5, 7 and 10% Ce, respectively.

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Figure 6: (a) HRTEM image of 5% Ce-doped ZnO rods, and (b) TEM image of the 10% Ce-doped ZnO rods showing CeO₂...

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Figure 7: N₂ adsorption/desorption curves at 77 K for ZnO and 5%-doped ZnO rods, giving surface areas of 21.7...

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Figure 8: (a) Influence of the doping in Ce of ZnO rods for the degradation of Orange II in aqueous solution (...

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Figure 9: Influence of the pH of the Orange II solution on the photocatalytic activity of 5% Ce-doped ZnO rod...

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Figure 10: Effects of (a) the catalyst amount and (b) the dye concentration on the photocatalytic activity of ...

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Figure 11: Effects of various salts on the photocatalytic efficiency of the ZnO:Ce rods used under solar light...

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Figure 12: Effects of (a) transition metal salts and (b) of organic compounds and Na₂S on the photocatalytic e...

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Figure 13: Recyclability of the ZnO:Ce photocatalyst.

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Figure 14: Influence of t-BuOH, benzoquinone and oxalic acid used as ^•OH, O₂^•− and h⁺ scavengers, respectively...

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Scheme 2: Schematic representation of the photocatalytic activity of ZnO:Ce rods.

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Published 26 Sep 2016

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Improving magnetic properties of Mn- and Zn-doped core–shell iron oxide nanoparticles by tuning their size

CdSe nanorod/TiO2 nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

ZnO nanoparticles sensitized by CuInZnxS2+x quantum dots as highly efficient solar light driven photocatalysts

High performance Ce-doped ZnO nanorods for sunlight-driven photocatalysis

CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

ZnO nanoparticles sensitized by CuInZn_xS₂₊_x quantum dots as highly efficient solar light driven photocatalysts