Wettability of Nanostructured Surfaces

There are many studies in literature concerning contact angle measurements on different materials/substrates. It is documented that textiles can be coated with multifunctional materials in form of thin films or nanoparticles to acquire characteristics that can improve the protection and comfort of the wearer. The capacity of oxide nanostructures to inhibit fungal development and neutralize bacteria is a direct consequence of their wetting behavior [1–6]. Moreover, the radical modification of wetting behavior of nanostructures from hydrophilic to hydrophobic when changing the pulsed laser deposition (PLD) ambient will be thoroughly discussed

Effect of Maleic Anhydride-aniline Derivative Buffer Layer on the Properties of Flexible Substrate Heterostructures: ITO/Nucleic Acid Base/Metal

Date du colloque : 10/2010International audienc

Effect of maleic anhydride–aniline derivative buffer layer on the properties of flexible substrate heterostructures: Indium tin oxide/nucleic acid base/metal

This paper presents some investigations on the properties of guanine (G) and cytosine (C) based heterostructures deposited on flexible substrates. The effects of two types of maleic anhydride–aniline derivatives (maleic anhydride-cyano aniline or maleic anhydride-2,4 dinitroaniline) buffer layer, deposited between indium tin oxide and (G) or (C) layer, on the optical and electrical properties of the heterostructures have been identified.The heterostructures containing a film of maleic anhydride-2,4 dinitroaniline have shown a good transparency and low photoluminescence in visible range. This buffer layer has determined an increase in the conductance only in the heterostructures based on (G) and (C) deposited on biaxially-oriented polyethylene terephthalate substrate

Organic flexible heterostructures with Al:ZnO transparent conductor electrode for photovoltaic applications

Date du colloque : 10/2014International audienc

Maple prepared organic heterostructures for photovoltaic applications

In this study, we present the deposition of ZnPc, Alq3, and PTCDA thin films using Matrix Assisted Pulsed Laser Evaporation (MAPLE) technique. We also report the realisation of multilayer structures, made by the successive application of MAPLE. The films have been characterized by spectroscopic (UV–VIS and Photoluminescence) and microscopic (SEM and AFM) methods, and the effect of different deposition conditions such as fluence, number of pulses, and target concentration on the properties has been analysed. This paper also presents some investigations on the electrical conduction in sandwich type structures ITO or Si/organic layer/Au or Cu and ITO/double organic layer/Cu, emphasising the dominant effect of the height of the energetic barriers at the inorganic/organic and organic/organic interfaces

Femtosecond laser ablation and structuring of a hard bi-layered coating

We studied surface modification of a bi-layered coating (Al2O3/TiAlN/steel) induced by fs laser with single and multi-pulse irradiation. The laser pulses (λ=775 nm, τ=200 fs) were generated by a Ti:sapphire laser. The single pulse threshold fluence for ablation of the top Al2O3 layer was Dath =0.56 Jcm-2. Single pulse actions with fluence increased up to 16.47 Jcm-2 caused widening of ablated area without significant change of the TiAlN layer underneath. In case of multipulse irradiation, periodical surface structures (LIPSS) were induced on the TiAlN layer surface. The average periodicity of created LIPSS was 600 nm.Physical chemistry 2012 : 11th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 24-28 September 201

Thin films of arylenevinylene oligomers prepared by MAPLE for applications in non-linear optics

This paper discusses two arylenevinylene oligomers with optical nonlinear properties. Their trans molecular structure was confirmed by Fourier Transform Infrared Spectroscopy and Nuclear Magnetic Resonance. Second Harmonic Generation and two-photon fluorescence have been observed on Matrix Assisted Pulsed Laser Evaporation-deposited thin films. We have seen two local maxima in UV–Vis spectra and a red shift of the photoluminescence peak for carbazole-based oligomer, which can be correlated with a higher conformational flexibility and with strong polarization interactions in the solid state. Scanning Electron Microscopy and Atomic Force Microscopy images have revealed a grainy morphology of the film deposited on titanium and a higher roughness for carbazole-based oligomer. Second harmonic measurements have shown nearly equal values of the second-order nonlinear optical coefficient for the triphenylamine and carbazole-based oligomers for Plaser < 100 mW. z-Scan and x-scan representations of the carbazole-based oligomer film have shown strong two-photon fluorescence intensity inside the sample confirming a volume process, and a strong second harmonic at the surface of the sample determined by the surface morphology

Probing electron-phonon coupling in metals via observations of ablation plumes produced by two delayed short laser pulses

International audienceWe investigate electron-phonon coupling in metals by analyzing the composition of plumes produced by laser ablation with two delayed short laser pulses. Samples of Ti, Zr, and Hf are chosen since they have similar thermo-physical properties but significant different atomic masses. It is shown that the atomic emission intensity increases with the interpulse delay, whereas the nanoparticle emission intensity decreases. The characteristic time of plume changes is found to depend linearly on the metals' atomic mass. Theoretical considerations suggest that the measured times equal to the characteristic times of electron-lattice relaxation