Laboratoire de réactivité de surface

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  • Article dans une revue

Surface Segregation of Pd from TiO2-Supported AuPd Nanoalloys under CO Oxidation Conditions Observed In situ by ETEM and DRIFTS

Laurent Delannoy, Suzanne Giorgio, Jean-Gabriel Mattei, Claude R. Henry, Nadia El Kolli, Christophe M Éthivier, Catherine Louis

A TiO2-supported AuPd bimetallic catalyst with an Au/Pd atomic ratio of 8 was prepared by deposition-precipitation with urea, and its activity in CO oxidation at room temperature was compared to the one of a monometallic Au/TiO2 catalyst. X-ray photoelectron spectroscopy (XPS) and diffuse…

ChemCatChem, 2013, pp.1-11. ⟨10.1002/cctc.201200618⟩. ⟨hal-00836230⟩

  • Article dans une revue

Comparison between tungsten carbide and molybdenum carbide for the hydrodenitrogenation of carbazole

Agnieszka Szymanska-Kolasa, Marek Lewandowski, Celine Sayag, Dominique Brodzki, G. Djéga-Mariadassou

The activity of molybdenum and tungsten carbides in hydrodenitrogenation (HDN) of carbazole was studied. Transition metal carbides (Mo2C and W2C) were synthesized using the temperature-programmed reaction of the appropriate oxide precursor (MoO3 and WO3) with the following gas mixture: 10 vol.% CH4…

Catalysis Today, 2006, 119, pp.35-38. ⟨10.1016/j.cattod.2006.08.039⟩. ⟨hal-00128071⟩

  • Article dans une revue

Adsorption of functionalised thiols on gold surfaces: how to build a sensitive and selective sensor for a nitroaromatic compound?

F. Thery-Merland, Christophe Méthivier, Eric Pasquinet, Lionel Hairault, Claire-Marie Pradier

Adsorption of thiols of varying structures bearing amine, acid or aromatic functionalities was characterised by Polarisation Modulation Infrared Absorption Spectroscopy (PM-IRRAS). The so functionalised surfaces were then submitted to atmospheres containing traces of 2,4-…

Sensors and Actuators B: Chemical, 2006, 114, pp.223-228. ⟨10.1016/j.snb.2005.04.040⟩. ⟨hal-00111676⟩

  • Article dans une revue

Smartphone spectrometer for colorimetric biosensing

Yi Wang, Xiaohu Liu, Peng Chen, Nhung Thi Tran, Jinling Zhang, Wei Sheng Chia, Souhir Boujday, Bo Liedberg

We report on a smartphone spectrometer for colorimetric biosensing applications. The spectrometer relies on a sample cell with an integrated grating substrate, and the smartphone's built-in light-emitting diode flash and camera. The feasibility of the smartphone spectrometer is demonstrated…

Analyst, 2016, 141 (11), pp.3233 - 3238. ⟨10.1039/C5AN02508G⟩. ⟨hal-01547878⟩

  • Article dans une revue

Revisiting Acido-basicity of the MgO Surface by Periodic Density Functional Theory Calculations: Role of Surface Topology and Ion Coordination on Water Dissociation

Céline Chizallet, Guylène Costentin, Michel Che, Françoise Delbecq, Philippe Sautet

Low-coordinated (LC) ions at the MgO surface (noted Mg2+ LC and O2- LC with L ) 1-5), located on monatomic and diatomic steps, corners, step divacancies, and kinks, have been modeled thanks to periodic density functional theory (DFT) calculations (VASP). Ions of lowest coordination induce the…

Journal of Physical Chemistry B, 2006, 110, pp.15878-15886. ⟨10.1021/jp060840l⟩. ⟨hal-00112168⟩

  • Article dans une revue

Self-Assembling of Redox-Active Atrazine Poly(ethylenimine) Conjugates – Interfacial Electrochemical and Spectroscopic Characterization

Zhaohui Chen, Michèle Salmain, Claire-Marie Pradier, Nathalie Fischer-Durand, Alain Pailleret, Féthi Bedioui, Sandrine Zanna

Thin films of polymers tethered with both atrazine haptens and ferrocenyl (Fc) probes were formed on polycrystalline gold electrodes by taking advantage of the facile formation of self-assembled monolayers (SAMs) of thiolates. These films were characterized by polarization modulation Fourier…

Electroanalysis, 2006, 18 (7), pp.684-694. ⟨10.1002/elan.200503451⟩. ⟨inserm-00194708⟩

  • Article dans une revue

Stabilisation of small mono- and bimetallic gold–silver nanoparticles using calix[8]arene derivatives

Priyanka Ray, Marie Clément, Cyril Martini, Ibrahim Abdellah, Patricia Beaunier, José-Luis Rodriguez-Lopez, Vincent Huc, Hynd Remita, Isabelle Lampre

In this paper, we report the synthesis of octa(hydroxy)-octa(mercaptobutoxy)calix[8]arene and its use as a stabiliser of nanoparticles (NPs). We show that the reduction of gold and/or silver ions in the presence of this calix[8]arene in ethanolic solutions leads to the formation of very small…

New Journal of Chemistry, 2018, 42 (17), pp.14128-14137. ⟨10.1039/C8NJ02451K⟩. ⟨hal-02399078⟩

  • Article dans une revue

Co–Ru Nanoalloy Catalysts for the Acceptorless Dehydrogenation of Alcohols

Brandon Azeredo, Tayssir Ben Ghzaiel, Ning Huang, Kamila Kaźmierczak, Wenjie Shen, Guillaume Wang, Delphine Schaming, Patricia Beaunier, Philippe Decorse, Noémie Perret, Jennifer Peron, Marion Giraud, Carine Michel, Lorette Sicard, Jean-Yves Piquemal

The synthesis of Co–Ru bimetallic nanoparticles was performed by co-reduction of Co(II) and Ru(III) salts in octan-1-ol, acting both as a solvent and a mild reducing agent. The metal composition was varied in the entire range, from pure Co to pure Ru. Although Co and Ru are miscible in the bulk,…

ACS Applied Nano Materials, 2022, 5 (4), pp.5733-5744. ⟨10.1021/acsanm.2c00764⟩. ⟨hal-03821692⟩

  • Article dans une revue

Revealing Size Dependent Structural Transitions in Supported Gold Nanoparticles in Hydrogen at Atmospheric Pressure

Abdallah Nassereddine, Qing Wang, David Loffreda, Christian Ricolleau, Damien Alloyeau, Catherine Louis, Laurent Delannoy, Jaysen Nelayah, Hazar Guesmi

The enhancement of the catalytic activity of gold nanoparticles with their decreasing size is often attributed to the increasing proportion of low-coordinated surface sites. This correlation is based on the paradigmatic picture of working gold nanoparticles as perfect crystal forms having complete…

Small, 2021, pp.2104571. ⟨10.1002/smll.202104571⟩. ⟨hal-03367920⟩

  • Article dans une revue

What Do Tantalum Framework Sites Look Like in Zeolites? A Combined Theoretical and Experimental Investigation

Frederik Tielens, Tetsuya Shishido, Stanislaw Dzwigaj

Ab initio periodic DFT calculations on the structural and energy properties of different model tantalum framework sites in tantalum-substituted socialite cavities are presented and related to experimental FTIR measurements on Ta-containing SiBEA zeolites. The tantalum framework sites are…

Journal of Physical Chemistry C, 2010, 114 (21), pp.9923-9930. ⟨10.1021/jp102181m⟩. ⟨hal-00604808⟩