A5014114878- Silicon Nanostructures and Photoluminescence
- Nanowire Synthesis and Applications
- Semiconductor materials and devices
- Thermal properties of materials
- Carbon and Quantum Dots Applications
- Quantum Dots Synthesis And Properties
- Photoacoustic and Ultrasonic Imaging
- Thermal Radiation and Cooling Technologies
- Thermography and Photoacoustic Techniques
- Gas Sensing Nanomaterials and Sensors
- Nanoplatforms for cancer theranostics
- Thin-Film Transistor Technologies
- Advanced biosensing and bioanalysis techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Silicon Carbide Semiconductor Technologies
- Analytical Chemistry and Sensors
- Luminescence and Fluorescent Materials
- Semiconductor materials and interfaces
- Nanocluster Synthesis and Applications
- Anodic Oxide Films and Nanostructures
- Advanced Chemical Sensor Technologies
- Nonlinear Optical Materials Studies
- Advanced ceramic materials synthesis
- Sulfur Compounds in Biology
- Electrochemical sensors and biosensors
Université Claude Bernard Lyon 1
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Institut Lumière Matière
2000-2025
National Research Nuclear University MEPhI
2019-2022
Institute of Engineering Physics
2019-2022
Teem Photonics (France)
2020-2021
Institut National des Sciences Appliquées de Lyon
2011-2020
Institut des Nanotechnologies de Lyon
2011-2020
Institute of Nanotechnology
2015-2019
École Centrale de Lyon
1996-2019
Highly luminescent, stable, and biocompatible 3C-SiC quantum dots (QDs) with no protective shells have been applied for fluorescence imaging of biological living cells. Structural luminescent properties the QDs are described. Marking cells such highlights penetration, accumulation, heterogeneous distribution inside intracellular space.
We present a noncontact and nondestructive method to measure thermal conductivity in layered materials using micro-Raman scattering. This was successfully applied monocrystalline silicon whose found be 63 W/m K at about 550 °C then porous layers. For 50 μm thick layer with 50% porosity, we of 1 confirming the insulating properties this material.
Abstract Carbon dots (CDs) are easy-obtained nanoparticles with wide range of biological activity; however, their toxicity after prolonged exposure is poorly investigated. So, in vitro and vivo CDs the surfaces enriched hydroxylated hydrocarbon chains methylene groups (CD_GE), carboxyl phenol accompanied nitrogen (CD_3011), trifluoromethyl (CDF19) or toluidine aniline (CDN19) were aimed to be discovered. CDs’ was assessed on A549 cells (real-time cell analysis impedance, fluorescence...
We report here a theoretical model describing specific mechanisms of heat transport in as-prepared and oxidized meso-porous silicon layers. The is good agreement with experimental measurements performed by micro-Raman scattering on the layers surface. For first time, thermal conductivity inhomogeneity along porous layer thickness 100 μm studied. Direct correlation between morphology variations brought to fore. A new approach estimate local porosity based Si nanocrystallite size also proposed.
Abstract Presenting a safe alternative to conventional compound quantum dots and other functional nanostructures, nanosilicon can offer series of breakthrough hyperthermia‐based therapies under near‐infrared, radiofrequency, ultrasound, etc., excitation, but the size range sensitize these is typically too large (>10 nm) enable efficient imaging functionality based on photoluminescence properties quantum‐confined excitonic states. Here, it shown that Si nanoparticles (NPs) are capable...
Free charge carriers in mesoporous Si (meso-PS) consisting of nanocrystals small dimensions about 6--10 nm are investigated by the infrared-absorption technique. Adsorption acceptor molecules or filling pores with dielectric liquids found to increase concentration free holes (p) meso-PS up half doping level heavily boron-doped ${p}^{+}\ensuremath{-}\mathrm{Si}$ substrate $(p\ensuremath{\sim}5\ifmmode\times\else\texttimes\fi{}{10}^{18} {\mathrm{cm}}^{\ensuremath{-}3})$ from which was made....
The amount of hydrogen present in porous silicon (PS) nanostructures is analyzed detail. Concentration atomic chemically bound to the specific surface PS quantitatively evaluated by means attenuated total reflection infrared (ATR-IR) spectroscopy and temperature-programmed desorption (TPD) spectroscopy. concentration values are correlated nanoscale morphology. In particular, influence porosity, nanocrystallite dimension, shape on described. Hydrogen concentrations fresh, aged, as well...
A scanning thermal microscope (SThM) in the dc regime was used to study conductivity of homogeneous in-depth meso-porous silicon form thin films on a monocrystalline substrate. Measurements for different film porosities (30–80%) and thicknesses (100 nm–8 µm) were performed order estimate influence both layer porosity thickness values porous (PS). An analytical model predicting SThM measurement case ultra-thin monolayered samples calibrate technique, analyse experimental data determine...
Results concerning a Bragg surface wave device based on porous silicon and intended for sensing application are reported. Existence of optical waves structures is experimentally shown. Such expected to be very sensitive the grafting biological molecules. The authors demonstrate this effect by amine chemical groups. characterization using m-line spectroscopy shows that increase coupling angle about 20° after grafting. show porosity essential reaching high sensitivity.
Chemical transformations on the surface of commercially available 3C-SiC nanoparticles were studied by means FTIR, XPS, and temperature-programmed desorption mass spectrometry methods. Thermal oxidation SiC NPs resulted in formation a hydroxylated SiO2 layer with C3Si–H CHx groups over SiO2/SiC interface. Controllable followed oxide dissolution HF or KOH solution allowed size tuning from 17 to 9 nm. Oxide-free surfaces, terminated hydroxyls groups, can be efficiently functionalized alkenes...
Silicon nanoparticles (SiNPs) prepared by mechanical grinding of luminescent porous silicon were coated with a biopolymer (dextran) and investigated as potential theranostic agent for bioimaging sonodynamic therapy. Transmission electron microscopy, photoluminescence Raman scattering measurements dextran-coated SiNPs gave evidence their enhanced stability in water. In vitro experiments confirmed the lower cytotoxicity NPs comparison uncoated ones, especially high concentrations about 2 mg...
Critical analysis of the data reported by Zhong et al. (J. Am. Chem. Soc. 2013, 135 (22), 8350–8356) is carried out. In particular, one main results concerning formation photoluminescent silicon nanoparticles (Si NPs) in an aqueous solution (3-aminopropyl)trimethoxysilane (APTMS) and trisodium citrate dihydrate (Na3Cit) under microwave heating impugned. These are reconsidered here because what appear to be significant inaccuracies misinterpretations that have been spread through a wide...
Abstract Heavy metals present a threat to human health, even at minimal concentrations within the body. One source of exposure is due consumption low-level contaminated foodstuff and water. Lead cadmium have been shown be absorbed by accumulate organs like kidneys liver, they also associated many diseases including cardiovascular disease kidney dysfunction as well developmental disorders neurodegenerative diseases. Since this contamination lead found worldwide, limiting complicated novel...
Surface chemistry of as-prepared 3CSiC nanoparticles obtained by electrochemical etching bulk substrates was studied. Chemical environment found to influence strongly the photoinduced electronic transitions in nanoparticles. The different interfacial chemical environments nanoparticles, such as surface chemistry, solvent nature, and charges on absorption luminescence at room temperature, is described discussed detail. For example, oxidation induced passivation radiative band gap states...
In this article, we demonstrate that the thermal conductivity of nanostructured porous silicon is reduced by amorphization and also amorphous phase in can be created swift (high-energy) heavy ion irradiation. Porous samples with 41%-75% porosity are irradiated 110 MeV uranium ions at six different fluences. Structural characterisation micro-Raman spectroscopy SEM imaging show irradiation causes creation an Si but without suppressing its structure. We caused electronic-regime interactions,...
Abstract Metal–organic frameworks are appealing hybrid solids which attract continuously growing interest. Their advantageous application in sensing devices is demonstrated here. In particular, the use of a short‐pulse laser excitation luminescent metal‐organic framework reported for first time to favor ligand‐based emission. The designed MOF‐based system achieves vitro H 2 S dosing by turn‐on fluorescence with unprecedented sensitivity. Al‐MIL‐101‐based sensor detects sulfide produced...
nowadays, the photoacoustic imaging is in mainstream of cancer theranostics. In this study nanoparticles with previously proven properties, i.e. glucose-ethylenediamine carbon dots (GE-NPs), were tested for therapy. nanoparticle biocompatibility was analyzed cell toxicity and neurotoxicity experiments ex vivo. Biochemical parameters animal vivo after intramuscular implantation Lewis Lung carcinoma cells into C57/Black mouse line. GE-NPs at concentrations 0.1–1.0 mg/ml did not change...
Chemical burns are a significant concern in Ukraine, with growing interest new treatments. Carbon-based nanoparticles, due to their anti-inflammatory, antioxidant, and antibacterial properties, have shown promise for wound healing. This study aimed evaluate the efficacy of carbon dots (CD) derived from citric acid urea promoting healing both acidic- alkali-induced rat model. The results indicated that acid-induced were slower heal exhibited more inflammation compared same initial injury...
Experimental study of the hydrogen coverage a nanoporous silicon-specific surface reveals fractal nature silicon nanocrystallites constituting porous layer. A model describing nanocrystallite morphology is elaborated. The evolution nanocrystallites' dimension $(2.1--2.4)$ along with porosity deduced from correlation to experimental measurements concentration.
Mesoporous germanium (Ge) is a new nanostructured material with very high potential for numerous applications. Thermally induced structural evolution of this nanomaterial key point many high-temperature processes, such as epitaxy, example, in which it can be involved. In work, we investigate these changes occurring during thermal annealing vacuum temperature range between 250 and 650 °C. The influences the time well initial porous layer thickness on morphology reorganization mesoporous Ge...