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13 juin 2025

Ondes capillaires dans des fluides miscibles

Des chercheurs et chercheuses ont étudié les ondes capillaires qui peuvent exister à la frontière entre des fluides miscibles, une caractéristique physique transitoire inobservée jusqu’alors.

26 mai 2025

Une roulette de casino nanoscopique dans le silicium !

Une équipe de physiciennes et physiciens a réalisé la prouesse de mettre en évidence dans le cristal de silicium le déplacement d’un atome unique susceptible de sauter, sous excitation laser, (…)

9 janvier 2025

Pascale Fabre nommée ambassadrice médiation de CNRS Physique en 2025

Avec Charles Antoine, ces deux scientifiques effectueront des interventions à destination des élèves, des enseignantes et des enseignants, des personnalités politiques ou des industriels sur tout (…)

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Size effect in plasmonic-enhanced photocatalysis in Au/TiO 2 nanocomposites

Auteur(s): Awada Chawki, Benali Kanoun Mohammed, Ahmed Faheem, Saber Osama, Osama Aya, Osama Mostafa, Jonin C., Brevet Pierre-François

(Article) Publié: Optical Materials, vol. p. (2025)

Ref HAL: hal-05139815_v1
DOI: 10.1016/j.optmat.2025.117293
Exporter : BibTex | endNote
Résumé:

One of the important challenges encountered in photocatalysis applications is to fabricate high performance photocatalysts with an easy and low-cost fabrication method and sustaining a slow hole-electron recombination rate. The latter can be achieved by promoting the synergetic effect between noble metals and metal oxides such as titanium oxide (TiO 2 ) . In this work, gold nanostars/TiO 2 (GNS/TiO 2 ) nanocomposites were prepared using the impregnation method. A study of the dependence of the size on the synergetic effect of GNS/TiO 2 nanocomposites was investigated using TiO 2 nanoparticles with an average size of 5 nm and 20 nm, respectively. The structural, morphological, elemental and optical properties of GNS/TiO 2 nanocomposites were studied by X-ray diffraction (XRD), High-resolution transmission electron microcopy (HRTEM), Energy dispersion X-ray (EDX), selected area electron diffraction (SAED), Raman spectroscopy, adsorption/desorption isotherm, and UV-Vis optical spectroscopy techniques. The photocurrent study was performed with different films of GNS/TiO 2 nanocomposites indicating the importance of the size to enhance photocurrents with the presence of GNS.

The photocatalytic activity of the prepared nanocomposites was studied toward the photodegradation of the Naphthol Green B complex dye. 5 nm and 20 nm pure anatase TiO 2 exhibited a very fast degradation of the dye during 19 and 70 minutes with kinetics reaction rate of 0.078 and 0.03 min -1 respectively. By adding GNS, 5 nm and 20 nm GNS/TiO 2 showed shorter photodegradation time of 10 and 15 minutes with kinetics reaction rate of 0.241 and 0.155 min -1 respectively. The latter confirms the strong synergetic effect between GNS and 5nm TiO 2 that may come from its smaller size compared to the 20 nm TiO 2 nanocomposite system. The first principal calculations were performed to study the stability and electronic structures of the Au/TiO 2 composite interface. The interfacial charge properties and the potential drop between the gold and TiO 2 were also studied. The adsorption energies of the Naphthol Green B on the Au/TiO 2 composite interface were also examined.

Elaboration of hollow mesoporous organosilica nanospheres of various sizes

Auteur(s): Kongkaew Manisa, El Moujarrad I., Le Parc R., Mohammadi Paul, Gary-Bobo Magali, Carcel Carole, Toquer Guillaume, Trens Philippe, Maurin D., Oliviero Erwan, Dieudonne-George P., Ogawa Makoto, Bantignies J.-L., Man Michel Wong Chi

(Article) Publié: New Journal Of Chemistry, vol. 49 p.9600-9608 (2025)

Structural and Optical Analysis of Chemically Deposited ZnS Thin Films for Optoelectronic Devices Applications

Auteur(s): Hassan A. Arifa, Almoustapha Aboubacar, Ibrahim Halidou, Briot O., Juillaguet S., Peyre H., Aznar R., Chauvau Edouard

(Article) Publié: -Asian Journal Of Physical And Chemical Sciences, vol. 13 p.56-64 (2025)

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Ondes capillaires dans des fluides miscibles

Une roulette de casino nanoscopique dans le silicium !

Pascale Fabre nommée ambassadrice médiation de CNRS Physique en 2025

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