Wyniki wyszukiwania dla: R. Sanjinés

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Supported TiO2 films deposited at different energies: Implications of the surface compactness on the catalytic kinetics.

S. Rtimi, S. Giannakis, M. Bensimon, C. Pulgarin, więcej

Applied Catalysis B: Environmental > 2016 > 191 > C > 42-52

Insight is provided in this study for the effect of the TiO₂ film densification/compactness on polyethylene (PE-TiO₂) by sputtering TiO₂ at two very different energy levels. Uniform, adhesive low energy films were prepared by direct current magnetron sputtering (DCMS) and compared with films sputtered at high energy levels by high power impulse magnetron sputtering (HIPIMS). Nano-particulate TiO₂...

artykuł

In situ photoelectron spectroscopic characterization of reactively sputtered, doped vanadium oxide thin films

A. Krammer, A. Gremaud, O. Bouvard, R. Sanjines, więcej

Surface and Interface Analysis > 48 > 7 > 440 - 444

Thin films of pure vanadium oxide (VO_x) and Ge doped vanadium oxide (VO_x:Ge) have been deposited by reactive magnetron sputtering on Si (100) substrates. These films were characterized by means of in situ X‐ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy to address the doping induced changes in the core‐level and valence‐band spectra of the material. Doped films exhibit a...

artykuł

NbTiN thin films deposited by hybrid HiPIMS/DC magnetron co-sputtering

L. Del Giudice, S. Adjam, D. La Grange, O. Banakh, więcej

Surface and Coatings Technology > 2016 > 295 > C > 99-106

Nb_1−xTi_xN_y thin films (with 0≤x≤1 and 0.85≤y≤1.15) were deposited from Nb and Ti metallic targets using a hybrid process combining high-power impulse magnetron sputtering (HiPIMS) and DC magnetron sputtering (DCMS) techniques. Two series of Nb_1−xTi_xN_y films were deposited in which the HiPIMS mode was applied either to the Nb or to the Ti target while the second target (Ti or Nb) was operated in DCMS...

artykuł

Insight on the photocatalytic bacterial inactivation by co-sputtered TiO2–Cu in aerobic and anaerobic conditions

S. Rtimi, S. Giannakis, R. Sanjines, C. Pulgarin, więcej

Applied Catalysis B: Environmental > 2016 > 182 > Complete > 277-285

Co-sputtered TiO₂–Cu polyester (TiO₂–Cu-PES) under actinic light induced bacterial reduction of Escherichia coli in the presence of O₂ (air) and under anaerobic conditions. The bacterial inactivation/oxidation proceeds in the absence of O₂ (air) probably due to the highly oxidative TiO₂vb(h⁺) species and the toxic Cu present. By the choice of suitable scavengers, the presence of highly oxidative radicals...

artykuł

Accelerated self-cleaning by Cu promoted semiconductor binary-oxides under low intensity sunlight irradiation

S. Rtimi, C. Pulgarin, R. Sanjines, J. Kiwi

Applied Catalysis B: Environmental > 2016 > 180 > C > 648-655

Uniform adhesive TiO₂–ZrO₂ films co-sputtered on polyester (PES) under low intensity sunlight irradiation discolored methylene blue (MB) within 120min. The discoloration kinetics was seen to be accelerated by a factor four by TiO₂–ZrO₂–Cu containing ∼0.01% Cu, as determined by X-ray fluorescence (XRF). TiO₂–ZrO₂–Cu also increased also accelerated by a factor the discoloration of MB compared to TiO...

artykuł

Accelerated bacterial reduction on Ag–TaN compared with Ag–ZrN and Ag–TiN surfaces

O. Baghriche, S. Rtimi, A. Zertal, C. Pulgarin, więcej

Applied Catalysis B: Environmental > 2015 > 174-175 > C > 376-382

Ag–TaN sputtered on polyester (PES) accelerated >6 times the bacterial inactivation kinetics compared to TaN–PES under actinic light irradiation. Direct current pulsed magnetron sputtering (DCP) was used to sputter Ag–TaN–PES and TaN–PES. Complete bacterial reduction by Ag–TaN occurred within 20min compared to Ag–TiN (100min) and Ag–ZrN (90min). The co-sputtering of Ag and Ta on PES was carried...

artykuł

Duality in the Escherichia coli and methicillin resistant Staphylococcus aureus reduction mechanism under actinic light on innovative co-sputtered surfaces

S. Rtimi, M.K.S. Ballo, D. Laub, C. Pulgarin, więcej

Applied Catalysis A: General > 2015 > 498 > C > 185-191

The kinetics of bacterial reduction of Staphylococcus aureus (MRSA) on co-sputtered TiO₂/Cu-polyester (TiO₂/Cu-PES) was found to be little dependent on the applied light dose. But in the case of Escherichia coli, the bacterial reduction kinetics was observed to be strongly dependent on the applied light dose. The reasons for the different effect of the applied light dose on the bacterial reduction...

artykuł

Kinetics and mechanism for transparent polyethylene-TiO2 films mediated self-cleaning leading to MB dye discoloration under sunlight irradiation

S. Rtimi, C. Pulgarin, R. Sanjines, J. Kiwi

Applied Catalysis B: Environmental > 2015 > 162 > C > 236-244

Polyethylene-TiO₂ (from now on PE-TiO₂) transparent, non-scattering sputtered films have been found effective in the discoloration of methylene blue (MB) under low intensity solar simulated light. By Fourier transform attenuated infrared spectroscopy (ATR-FTIR), the systematic shift and decrease in the ν_s(CH₂) and ν_s(CC) vibration-rotational bands was observed preceding MB discoloration. RF-pretreatment...

artykuł

TaSiN nanocomposite thin films: Correlation between structure, chemical composition, and physical properties

G. Ramírez, D. Oezer, M. Rivera, S.E. Rodil, więcej

Thin Solid Films > 2014 > 558 > C > 104-111

The structural and electronic properties of fcc-TaN/SiN_x nanocomposite thin films deposited by reactive magnetron sputtering have been investigated as function of the N and Si contents. Our studies have been mainly focused on three different types of nanocomposite Ta_xSi_yN_z films based on: nitrogen deficient fcc-TaN_0.88, nearly stoichiometric fcc-TaN, and over-stoichiometric fcc-TaN_1.2 with the Si...

artykuł

Coupling of narrow and wide band-gap semiconductors on uniform films active in bacterial disinfection under low intensity visible light: Implications of the interfacial charge transfer (IFCT)

S. Rtimi, R. Sanjines, C. Pulgarin, A. Houas, więcej

Journal of Hazardous Materials > 2013 > 260 > Complete > 860-868

This study reports the design, preparation, testing and surface characterization of uniform films deposited by sputtering Ag and Ta on non-heat resistant polyester to evaluate the Escherichia coli inactivation by TaON, TaN/Ag, Ag and TaON/Ag polyester. Co-sputtering for 120s Ta and Ag in the presence of N ₂ and O ₂ led to the faster E. coli inactivation by a TaON/Ag sample within ∼40min...

artykuł

ZrNO–Ag co-sputtered surfaces leading to E. coli inactivation under actinic light: Evidence for the oligodynamic effect

S. Rtimi, M. Pascu, R. Sanjines, C. Pulgarin, więcej

Applied Catalysis B: Environmental > 2013 > 138-139 > Complete > 113-121

This study reports visible light sensitive ZrNO and ZrNO–Ag polyester samples prepared by sputtering in an Ar/N ₂ /O ₂ atmosphere leading to Escherichia coli bacterial inactivation. The bacterial inactivation by ZrNO avoids the increasing environmental concern involving the fate of Ag-leaching of many disinfectants. The simultaneous co-sputtering of ZrNO and Ag ₂ O enhanced...

artykuł

Effect of the spectral properties of TiO2, Cu, TiO2/Cu sputtered films on the bacterial inactivation under low intensity actinic light

O. Baghriche, S. Rtimi, C. Pulgarin, R. Sanjines, więcej

Journal of Photochemistry & Photobiology, A: Chemistry > 2013 > 251 > Complete > 50-56

Bacterial inactivation by TiO ₂ , Cu and TiO ₂ /Cu DC-magnetron sputtered thin films was systematically investigated in the dark and under low intensity visible/actinic light. Low intensity actinic light led to a fast 6log ₁₀ (complete) bacterial inactivation within the minute range. The TiO ₂ /Cu bifunctional composite films led to the fastest bacterial inactivation...

rozdział

Quantum integrated photonics on GaAs

S. Hofling, M. Lermer, J. Beetz, T. B. Hoang, więcej

COMMAD 2012 > 3 - 4

2012 Conference on Optoelectronic and Microelectronic Materials & Devices (COMMAD)

Progress towards the development of a quantum integrated photonics platform on GaAs will be reported, including on-chip single photon sources, detectors, splitters, couplers and modulators.

artykuł

Photocatalysis/catalysis by innovative TiN and TiN-Ag surfaces inactivate bacteria under visible light

S. Rtimi, O. Baghriche, R. Sanjines, C. Pulgarin, więcej

Applied Catalysis B: Environmental > 2012 > 123-124 > Complete > 306-315

This study presents the design, preparation, testing and characterization of TiN and TiN-Ag nanoparticulate films leading to photocatalytic and catalytic inactivation of Escherichia coli. When Ti was sputtered in N ₂ atmosphere, the TiN films unexpectedly revealed semiconductor properties when irradiated under visible light due to the formation of TiO ₂ showing absorption in the visible...

artykuł

Advantages of highly ionized pulse plasma magnetron sputtering (HIPIMS) of silver for improved E. coli inactivation

Oualid Baghriche, Abed Zertal, Arutiun P. Ehiasarian, R. Sanjines, więcej

Thin Solid Films > 2012 > 520 > 9 > 3567-3573

This study addresses the DC-magnetron sputtering (DCMS) of Ag-films on polyester and compares the results found for the E. coli inactivation with the inactivation obtained when applying highly ionized pulse plasma power magnetron sputtering (HIPIMS). The amounts of Ag needed to inactivate E. coli by HIPIMS sputtering were an order of magnitude lower than with DCMS indicating a significant saving of...

artykuł

Antibacterial Ag–ZrN surfaces promoted by subnanometric ZrN-clusters deposited by reactive pulsed magnetron sputtering

O. Baghriche, J. Kiwi, C. Pulgarin, R. Sanjinés

Journal of Photochemistry & Photobiology, A: Chemistry > 2012 > 229 > 1 > 39-45

Ag–ZrN films were deposited on polyester by direct current pulsed magnetron sputtering (from now on DCMSP) in Ar+N ₂ atmosphere. ZrN on the polyester surface interacts with Ag leading to Ag–ZrN films. These composite films were more active in Escherichia coli inactivation compared to the Ag-films by themselves. The E. coli inactivation kinetics on Ag–ZrN polyester surfaces was accelerated...

artykuł

Ag-surfaces sputtered by DC and pulsed DC-magnetron sputtering effective in bacterial inactivation: Testing and characterization

O. Baghriche, C. Ruales, R. Sanjines, C. Pulgarin, więcej

Surface & Coatings Technology > 2012 > 206 > 8-9 > 2410-2416

This study addresses the deposition of active, uniform nanoparticulate Ag-thin films on polyester textiles by DC-magnetron sputtering (DC) and pulsed DC-magnetron sputtering (DCP). The deposition of Ag on the polyester fiber was observed to be the function of the type of sputtering used and this has direct implications on the E. coli inactivation kinetics. The shortest E. coli inactivation was observed...

artykuł

High power impulse magnetron sputtering (HIPIMS) and traditional pulsed sputtering (DCMSP) Ag-surfaces leading to E. coli inactivation

O. Baghriche, A.P. Ehiasarian, E. Kusiak-Nejman, C. Pulgarin, więcej

Journal of Photochemistry & Photobiology, A: Chemistry > 2012 > 227 > 1 > 11-17

This study addresses the high power impulse magnetron sputtering (HIPIMS) deposition of Ag-nanoparticle films on polyester and the comparison with films deposited by direct current pulsed magnetron sputtering (DCMSP). The first evidence is presented for the Escherichia coli bacterial inactivation by HIPIMS sputtered polyester compared to Ag–polyester sputtered by DCMSP. HIPIMS layers were significantly...

artykuł

TaOxNy Sputtered Photoanodes For Solar Water Splitting

C.M. Leroy, R. Sanjines, K. Sivula, M. Cornuz, więcej

Energy Procedia > 2012 > 22 > Complete > 119-126

A series of TaO _x N _y photoelectrodes were deposited on F:SnO ₂ (FTO) substrates by DC reactive sputtering at room temperature, under a mixture of Ar, N ₂ and O ₂ . The effects of the O ₂ partial pressure during deposition (P _o2 ) on the films crystallinity, their chemical composition, their morphology as well as their absorption and photoelectrochemical...

artykuł

Electrical properties and applications of carbon based nanocomposite materials: An overview

R. Sanjinés, M.D. Abad, Cr. Vâju, R. Smajda, więcej

Surface & Coatings Technology > 2011 > 206 > 4 > 727-733

The allotropic forms of carbon (amorphous and polycrystalline graphite, carbon black, fullerenes, nanotubes, graphene) exhibit a large variety of charge transport properties which have been stimulating fundamental and applied research for the development of new devices based on micro and nano-sized electronic systems. Carbon based nanocomposites offer the possibility to improve the device performances...

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