Hynd Remita

Hynd Remita
Université Paris-Saclay · Chemistry

PhD. Habilitation

About

184
Publications
60,426
Reads
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7,302
Citations
Additional affiliations
March 2016 - present
Université Paris-Saclay
Position
  • Research Director
January 2005 - December 2015
French National Centre for Scientific Research (CNRS)
Position
  • Managing Director
January 1999 - December 2012
Université Paris-Sud
Position
  • Université Paris-Sud 11

Publications

Publications (184)
Article
Full-text available
Conjugated polymers (CPs) have been recently widely investigated for their properties and their applications in different fields including photocatalysis. Among the family of CPs, polypyrrole (PPy) has been the most extensively studied owing to its good environmental stability, high electrical conductivity, superior redox properties and easy synthe...
Article
Personalized medicine approach in radiotherapy requires the delivery of precise dose to the tumor. The concept is to increase the effectiveness of radiotherapy while sparing the surrounding heathy tissue. This can be achieved by the use of high-Z metal-based nanoparticles (NPs) as radio-enhancers and PET imaging for mapping NPs distribution to guid...
Article
Conjugated polymers have emerged as very active photocatalysts under visible light. Among these materials, nanostructured polypyrrole (PPy) has recently been used as photocatalyst for degradation of environmental pollutants under UV as well as visible light. In the present study, we specifically explored the photocatalytic activity of conducting PP...
Article
Full-text available
Gold nanoparticles (AuNPs) were functionalized by ruthenium porphyrins through a sulfur/gold covalent bond using a three-steps reaction. The catalyst was characterized by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) in order to control the binding of ruthenium porphyrin on AuNPs’ surface. The catalyst was tested and compa...
Article
Conjugated polymers have emerged as very active photocatalysts under visible light. Among these materials, nanostructured polypyrrole (PPy) has recently been used as photocatalyst for degradation of environmental pollutants under UV as well as visible light. In the present study, we specifically explored the photocatalytic activity of conducting PP...
Article
Full-text available
Purpose: Metal-based nanoparticles (M-NPs) have attracted great attention in nanomedicine due to their capacity to amplify and improve the tumor targeting of medical beams. However, their simple, efficient, high-yield and reproducible production remains a challenge. Currently, M-NPs are mainly synthesized by chemical methods or radiolysis using to...
Article
A facile development of highly efficient photocatalytic nanostructures for solar fuel production via controlled cocatalyst deposition is described. 2 nm-Pt nanoparticles were selectively synthesized by radiolysis on polypyrrole (PPy), TiO2 or on both PPy-TiO2 (noted respectively (Pt-PPy)-TiO2, (Pt-TiO2)-PPy and Pt-(PPy-TiO2)). The PPy nanostructure...
Article
Heterojunctions of small CuO nanoclusters (synthesized by radiolysis) with TiO2 (commercial P25) induced a photocatalytic activity under visible light irradiation in a wide range of wavelengths due to the narrow bandgap of CuO nanoclusters of around 1.7 eV. The optical, chemical, and electrical properties of these composite nanomaterials were studi...
Article
Full-text available
In artificial photosynthesis, chemists are aiming to borrow principles from natural photosynthesis to develop photoelectrochemical cells (PEC) for water splitting. The water plastoquinone photooxidoreductase enzyme, also known as Photosystem II, uses light to perform the four-electron, four-proton oxidation of water to dioxygen and stores reducing...
Article
Full-text available
In this paper, we report the first synthesis and characterisations of bimetallic gold(I)-silver(I) calix[8]arene complexes. We show that the radiolytic reduction of these complexes leads to the formation of small bimetallic nanoparticles with an alloyed structure, as evidenced by XPS, HR-TEM and STEM/HAADF-EDX measurements
Article
Antineoplastic agents are, for most of them, highly toxic drugs prepared at hospital following individualized prescription. To protect patients and healthcare workers, it is important to develop analytical tools able to identify and quantify such drugs on a wide concentration range. In this context, surface enhanced Raman spectroscopy (SERS) has be...
Article
Full-text available
Nanomedicine has stepped into the spotlight of radiation therapy over the last two decades. Nanoparticles (NPs), especially metallic NPs, can potentiate radiotherapy by specific accumulation into tumors, thus enhancing the efficacy while alleviating the toxicity of radiotherapy. Water radiolysis is a simple, fast and environmentally-friendly method...
Article
Light harvesting capability and charge carriers lifetime play critical roles in determining the photoefficency of photocatalyst. Herein, a one-pot method is proposed to design mesostructured TiO2 materials by taking advantage of the ability of cellulose nanocrystals (CNC) to self-assemble into chiral nematic structures during solvent evaporation. A...
Preprint
Full-text available
br> Light harvesting capability and charge carriers lifetime play critical roles in determining the photoefficency of photocatalyst. Herein, a one-pot method is proposed to design mesostructured TiO<sub>2</sub> materials by taking advantage of the ability of cellulose nanocrystals (CNC) to self-assemble into chiral nematic structures during solve...
Article
Engineering photocatalysts based on gold nanoparticles (AuNPs) has attracted great attention for the solar energy conversion due to their multiple and unique properties. However, boosting the photocatalytic performance of plasmonic materials for H2 generation have reached some limitation. In this study, we propose a soft-chemistry method for the pr...
Article
Full-text available
This paper deals with the synthesis of calixarenes-stabilised metallic nanoparticles. Indeed, this topic has received an increasing attention during the last few years, due to the interesting features displayed by these nanoobjects. However, most of these studies describe the formation of such nanoparticles by reducing a mixed calixarene stabiliser...
Article
A chemoselective native protein modification in near-organ medium was achieved using new benign palladium nanoparticles.
Article
Full-text available
Green hydrogen production by photocatalytic water splitting offers a promising way to solve environment and energy issues. Conjugated polymer nanostructures (CPNs), with highly π-conjugated structures, have been demonstrated as a new class of photocatalysts. However, the pristine CPNs shows poor photocatalytic activity for hydrogen generation owing...
Article
The photocatalytic disinfection (PCD) properties of TiO2 have attracted the attention in the research communities because the produced reactive oxygen species (ROS) allow destruction of different types of microbes, like fungi, bacteria, viruses, algae, unicellular organisms, etc. on surfaces, in water and air. However, TiO2 requires UV irradiation...
Article
Full-text available
Redox reactions are of great importance in environmental catalysis. Gold nanoparticles (Au-NPs) have attracted much attention because of their catalytic activity and their localized surface plasmon resonance (LSPR). In the present study, we investigated, in detail, the reduction of ferricyanide (III) ion into a ferrocyanide (II) ion catalyzed by sp...
Preprint
Full-text available
Redox reactions are of great importance in environmental catalysis. Gold nanoparticles (NPs) have attracted much attention because of their catalytic activity and their localized surface plasmon resonance (LSPR). In the present study, we investigated in details the reduction of ferricyanide (III) ion into ferrocyanide (II) ion catalyzed by spherica...
Article
Improving the photogeneration and the lifetime of charge carriers associated with light harvesting is among the main challenges facing materials for photocatalysis. We report here the synthesis of mesoporous TiO2 containing a replica of a chiral nematic structure (CNS) as a photocatalyst with improved light harvesting and photogenerated charge carr...
Article
Full-text available
A significant enhancement of the second harmonic generation (SHG) from second-order nonlinear optical (NLO) dyes in solution has been evidenced when these dyes were grafted onto the surface of spherical gold nanoparticles (AuNPs), as compared to their NLO response without AuNPs. The length, as well as the nature of the spacers between the gold part...
Article
Full-text available
Coupling metal-organic frameworks (MOFs) with inorganic semiconductors has been successfully tested in a variety of photocatalytic reactions. In this work we present the synthesis of TiO2/HKUST-1 composites by grinding, solvothermal, and chemical methods, using different TiO2 loadings. These composites were used as photocatalysts for hydrogen produ...
Article
Full-text available
Plasmonic catalysis enables the realization of reactions using solar light with less energy and time consumption. Pd nanoflowers synthesized by a radiolytic reduction of Pd II (acac) 2 in ethanol under a CO atmosphere exhibit a broad plasmon band in the visible-near infrared domain. These plasmonic nanostructures showed remarkably enhanced the phot...
Article
Hydrogen production using plasmonic photocatalyst has attracted increasing attention since it improves light harvesting and photoefficiency. Herein, we have designed a plasmonic photocatalyst in a core–shell nanostructure that enabled an improvement of light harvesting and photocatalytic production of hydrogen using a very low amount of gold nanopa...
Article
Conjugated polymer nanostructures (CPNs) emerge as a new class of photocatalysts for organic pollutant degradation under UV and visible light. Polyprrole (PPy), as a conjugated polymer, exhibits a wide range of applications. We present here the first demonstration of employing pure PPy nanostructures as a very efficient photocatalyst for water depo...
Article
Photochemical conversion of solar photons is one of the most promising solutions to produce usable forms of energy such as electricity, solar fuels and environmental remediation. We have developed an efficient visible light active poly(diphenylbutadiyne) (PDPB)-ZnO nanohybrids (NHs) by facile adsorption of ZnO nanoparticles on PDPB nanofibers. The...
Article
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 spherical nanoparticles (NPs) that are homogeneous in si...
Chapter
The concept of visible‐light‐driven photocatalytic activity permits more efficient use of solar energy and continues to attract scientific community for sustainable solutions to many environmental issues. Conducting polymer nanostructures possess a high electrical conductivity, large surface area, short path length for ion transport, and a large ab...
Chapter
Full-text available
This chapter presents different examples of surface modification of TiO2 with metal nanoparticles (NPs) for photocatalytic applications: water depollution (mainly phenol photodegradation) and hydrogen production. It shows that time resolved microwave conductivity (TRMC) is a very powerful method to study charge‐carrier dynamics and to understand th...
Article
Full-text available
Materials are key roadblocks for the commercialization of energy conversion devices in fuel cells and solar cells. Significant research has focused on the tuning of the intrinsic properties of materials at the nanometer scale. The soft template mediated controlled fabrication of advanced nanostructured materials is attracting considerable interest...
Article
Full-text available
Abstract Photocatalysis has attracted a lot of interest because of its large application in the environmental field. Therefore, development of stable photocatalysts with activity under solar irradiation is a big challenge. Titanium dioxide (TiO 2 ) is a semi-conductor widely used. In this article, the possibilities to extend its activity domain in...
Article
Full-text available
En raison de sa couleur et de ses propriétés de métal noble, l'or a depuis toujours été un élément de fascination et de convoitise. Des démonstrations avec des nanoparticules d'or se prêtent bien aux actions de formation et de dissémination des sciences. Des expériences faciles et ludiques peuvent montrer au grand public comment les pro-priétés cha...
Article
BiOCl-TiO2 composites were synthesized by sol-gel method; using two commercial BiOCl (P2600 and SB) with different BiOCl-TiO2 weight ratios. They were characterized by different techniques such as X-ray diffraction (XRD), electron microscopy (SEM, HRTEM and TEM), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), time resolv...
Article
Because of the color and the noble properties of the gold metal, it has been for long an element of fascination and lust. Demonstrations with gold nanoparticles are a tool to promote education and dissemination of science. Easy and funny experiments are able to show to the general public how nanoscale properties change with size and shape and can e...
Article
The ubiquitous electrochemistry is expected to play a major role for reliable energy, and for production of sustainable fuels and chemicals. For organics-based electrocatalysis in an alkaline medium, the fundamental understandings at solid-liquid interfaces involve relatively complex mechanisms and performance descriptors (from the electrolyte and...
Article
Full-text available
Conjugated polymer nanostructures have recently emerged as a new class of very active photocatalysts under solar light. Poly(3-hexylthiophene) (P3HT) is one of the commonly used conjugated polymers for photovoltaics applications . P3HT nanostructures synthesized in soft templates provided by hexagonal mesophases show high photocatalytic activity fo...
Article
Full-text available
Backgroud Small metallic nanoparticles are proposed as potential nanodrugs to optimize the performances of radiotherapy. This strategy, based on the enrichment of tumours with nanoparticles to amplify radiation effects in the tumour, aims at increasing the cytopathic effect in tumours while healthy tissue is preserved, an important challenge in rad...
Article
Full-text available
TiO2 surface modification with bimetallic nanoparticles (NPs) has demonstrated to be a strategy to enhance the hydrogen generation via photocatalysis and to minimize the use of expensive noble metals. A better understanding of the role of bimetallic NPs is of crucial importance to design efficient photocatalysts. Here, we show a systematic study of...
Chapter
From endeavors of the last quarter of the century gone by, newly released “jewelry” of the materials science, namely, self-assembled and self-supported giant nanoarchitectures have received tremendous interest from all areas of nanoscience and nanotechnology. Indeed, recently developed approaches for the fabrication of nanomaterials have opened new...
Article
Small gold nanoparticles (Au-NPs) were used to modify the surface of titanium dioxide as visible-light absorbers and thermal redox active centers. Au-NPs were synthesized on commercial TiO2 (P25) by reduction with tetrakis(hydroxymethyl)phosphonium chloride. The Au/P25 composites were characterized by different techniques such as X-ray diffraction...
Article
We report a novel “one-pot”, convenient and efficient method based on radiolysis to synthesize gold-based nanoparticles finely dispersed on reduced graphene oxide (rGO) nanosheets obtained from reductive transformation of graphene oxide (GO). Extensive characterizations of the metal/rGO nanocomposites were performed and revealed that the optimized...
Article
Full-text available
TiO2 nanotubes arrays (NTs), obtained via electrochemical anodization of Ti foil, were modified with monometallic (Cu, Bi) and bimetallic (AgCu) nanoparticles. Different amounts of metals’ precursors were deposited on the surface of NTs by the spin-coating technique, and the reduction of metals was performed via gamma radiolysis. Surface modificati...
Article
Decahedral TiO2 decorated with bimetallic nanoparticles were synthesized via radiolysis and photodeposition method. The effect of bimetallic surface composition (Ag_Pt, Ag_Au, Au_Pd, Au_Pt) as well as deposition technique (simultaneous or sequential) on the photocatalytic activity in phenol degradation and efficiency of hydroxyl radicals generation...
Article
Full-text available
The use of nanoparticles to enhance the effect of radiation-based cancer treatments is a growing field of study and recently, even nanoparticle-induced improvement of proton therapy performance has been investigated. Aiming at a clinical implementation of this approach, it is essential to characterize the mechanisms underlying the synergistic effec...
Article
In this study, we have tailored both the active electrode with silver modified TiO2 (Ag–TiO2) as well as the counter electrode (CE) with Pt–reduced graphene oxide (Pt@RGO) nanocomposites to realize efficient and low cost devices. The synergistic combination of both modified electrodes leads to an improved light to electrical energy conversion with...
Article
Au and/or Ni nanoparticles were synthesized by radiolysis on TiO2 (commercial P25) at various composition (metal content). The modified photocatalysts were characterized by High Resolution Transmission Microscopy (HRTEM), Energy-Dispersive X-ray Spectroscopy (EDS), UV-Vis Diffuse Reflectance Spectroscopy (DRS) and X-Ray Photoelectron Spectroscopy (...
Article
TiO2 (P25) was modified with small and relatively monodisperse mono- and bimetallic clusters (Ag, Pd, Pt, Ag/Pd, Ag/Pt and Pd/Pt) induced by radiolysis to improve its photocatalytic activity. The as-prepared samples were characterized by X-ray fluorescence spectrometry (XRF), photoluminescence spectrometry (PL), diffuse reflectance spectroscopy (DR...
Article
Ag and CuO nanoparticles (NPs) synthesized on the surface of commercial TiO2 (P25) by radiolytic reduction were characterized by Diffuse Reflectance Spectroscopy (DRS), Transmission Electron Microscopy (TEM), High Angle Annular Dark Field Scanning Transmission Electron Microscopy (HAADF-STEM), Energy-Dispersive X-ray Spectroscopy (EDS), X-ray Photo...
Article
Full-text available
Proton caged compounds exhibit a characteristic behavior when directly dosed into cells or being coupled to gold nanoparticles prior to the dosing. When irradiated in the near ultraviolet region, they release protons that interact with intracellular HCO3− to yield H2CO3. The dissociation of carbonic acid, then, releases CO2 that can be distinctivel...
Article
Full-text available
The development of visible-light responsive photocatalysts would permit more efficient use of solar energy, and thus would bring sustainable solutions to many environmental issues. Conductive polymers appear as a new class of very active photocatalysts under visible light. Among them poly(3,4-ethylenedioxythiophen