Nanocoatings and ultra-thin films: Technologies and applications
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Composition and structure of the films were studied by Raman scattering spectroscopy, X-ray photoelectron spectroscopy XPS , He ion microscopy and atomic force microscopy AFM were used. Cu atomic concentration in DLC:Cu films varied in at. Very different sizes of the Cu nanoclusters was observed in nanocomposite films grown by using different deposition conditions. Structure of the DLC matrix varied in broad range, too.
Despite that, the maximum of the surface plasmon resonance peak of the absorbance spectra was in nm range for all studied DLC:Cu films. Nonlinear optical properties of the selected samples were investigated. Possibility to use DLC:Cu films as self saturable absorbers for fiber lasers was considered. The required processing conditions vary according to the targeted application to have amorphous or crystalline films, dense or porous layers, low-temperature process or not, etc. We have explored the variation of TiO2 crystallinity, optical thickness, composition and porosity upon variation of ALD process precursor and substrate temperature and subsequent heat treatment temperature and duration.
Nano-engineered coatings and thin films: from design to applications
The thickness loss is higher for lower deposition temperatures and comes along with an increase of the refractive index. All the samples that were stable during heat treatment were stable in KOH. Likewise, samples that shrunk during heat treatment failed to protect the silicon from KOH attack. The composition and the structure of the films have been investigated by FTIR, XRD and ellipsometry porosimetry to understand the relation between the chemical instability and the dependence of refractive index and thickness loss on process conditions.
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Resume : Biocompatible and biodegradable materials are of high interest for tissue engineering, drug delivery and wound healing and their development is required for a new generation healthcare materials. It is considered that most of the common polymers used for biomedical applications, such as polylactic acid PLA and polycaprolactone PCL are not capable to sufficiently support the cell growth. When we are talking about the nanofibers prepared from these biodegradable polymers, their hydrophobicity is increasing even more and, as result, the biocompatibility of these materials will be very low in spite that the structure of nanofibers is similar to the extracellular matrix.
Hence, in order to apply the biodegradable nanofibers for wound healing or tissue engineering applications, their surface properties must be tuned accordingly. The deposition of thin plasma coatings containing amine or carboxyl groups opens the possibility to adjust independently the surface chemistry, wettability and charge. Here we are reporting the methodology to coat electrospun PCL nanofibers by COOH coatings in order to graft the bioactive molecules and antibiotics via the reactive surface groups.
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The XPS results confirmed the grafting of bioactive molecules and their release rate depends on the stability properties of plasma layers. Our in vitro and in vivo results demonstrated that the modified nanofibers has high potential for tissue engineering. Authors gratefully acknowledge the financial support of the Russian Science Foundation grant No. Resume : Direct methane-fueled solid oxide fuel cells DM-SOFCs are promising next-generation energy conversion devices that show advantages such as easy storage, low manufacturing cost and infrastructure for fuel. However, slow anode kinetics and carbon coking on the anode surface at low temperatures may reduce the performance and stability of the SOFC.
Ruthenium Ru is a well-known methane oxidation catalyst with carbon coking resistance by converting methane by partial oxidation and reforming. However, Ru shows poor thermal stability when it is fabricated in the nanoporous structure for high performance due to high surface free energy.
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Ru 20YSZ exhibits the highest performance 3. Coking behavior at anode surface is also characterized by using high-resolution X-ray photoelectron spectroscopy XPS. Resume : Mechanoresponsive diacetylenes DAs exhibiting a transition of crystalline orientation from light-inert to light-active state upon applied force are introduced.
Amide units are introduced to DAs where hydrogen bonding is utilized to control intermolecular interactions. Subsequent UV irradiation at a wavelength of nm enabled the polymerization of the pressed region, changing its color from white to blue which suggests the selective formation of polydiacetylene PDA polymorphs.
As a result, by utilizing the mechanoresponsive crystallinity with low-enough activation pressure, a new strategy for PDA patterning is demonstrated based on the selective transfer of information by means of force to a DA film. This phenomenon can be applicable to a new nanoimprinting technique where no mechanical deformation of resist materials but phase transition is induced by the mold. The combination of no net moment and anisotropy make MRG suitable for high-frequency 0. Here we explore novel spacer layers TiN, Hf, HfOx, V and Mo , and demonstrate their effectiveness when the magnetoresitive stacks are subjected to a thermal anneal at oC.
Mo and Hf are shown to prevent diffusion, maintaining the structural and magnetotransport properties of the device, and show potential for expitaxial growth on MRG. Resume : Evaporative drying of saline water droplets on solid substrates is a complex yet interesting field of research in last few decades. A simple but novel approach is used to fabricate oriented nano as well as micro-crystalline domains of NaCl over large area using line nano-patterned and bio-mimicked from rose petals Polydimethylsiloxane PDMS templates simply by evaporation-mediated drying of dilute NaCl-Methanol solutions.
Reasonably dilute methanol-based salt solutions causes significant droplet spreading and initially anisotropic droplet shape induced by nano-patterning is transformed into almost spherical one due to faster retraction of wetting front along the lines in the solvophilic direction. Within the final uniform thin film deposits salt nano-patterns are preferentially oriented within the grooves of the nano-lines as observed through high resolution field enhanced scanning electron microscopy FESEM studies.
The same dispersion droplet gets pinned after spreading when dispensed on negative rose petal replica NRPR giving rise to bigger deposits. FESEM measurements reveal small micron-sized ca. Varying salt concentration seems to influence the crystal size within the troughs of NRPR. Increased salt concentration reduces the initial spreading of the droplet leading to small-sized final deposit and bigger-sized single crystals within troughs. Resume : Polymer electrolyte membrane fuel cells PEMFCs have received attentions as a next-generation eco-friendly energy conversion system, especially for future vehicles.
Nanocoatings and Ultra-Thin Films. Technologies and Applications. A volume in Woodhead Publishing Series in Metals and Surface Engineering. Book • Technologies and Applications . Part two focuses on the applications of nanocoatings and ultra-thin films, with chapters covering topics such as nanocoatings.
However, the high price and low stability of platinum Pt catalysts are considered to be the biggest obstacles in the full commercialization of fuel cell electric vehicles FCEV. Recently, atomic layer deposition ALD has been successfully utilized for synthesizing nanoparticle catalysts in various fields with unique properties including accurate thickness and composition control and conformal deposition even along complex-shaped substrates.
This result will be discussed in more details at the presentation. One of the ways to improve wear resistance and strength of solid lubricant coatings SLC is their together joint use with a hard and wear-resistant materials in composite structures of the films. And with the other hand, the properties of the hard coatings may be improved with the SLC adding.
The paper considers the various composite structures of the hetero-tribological coatings, including variants based on discrete planar elements. Hetero-tribological coatings based at the magnetron sputtering deposition technology are presented. The influences of the HTC composite structure components synergetic effects on the coating properties are studied. Resume : So far, I have reported the results of experiments and molecular dynamics MD simulations of organic graphoepitaxy, that is, oriented thin film growth of organic semiconductors such as sexithiophene C24H14S6 and pentacene C22H14 on micro-grooved substrate surfaces fabricated by electron beam lithography [].
Through these studies, I found that MD simulations were useful in reproducing experimental results of organic graphoepitaxy, and these results naturally led me to the MD simulations of organic semiconductor thin film growth on simple flat surfaces. However, owing to the limitation of time and the number of molecules which can be treated within the limited capability of computation, it seems hard to reproduce the process in which rod-shaped molecules such as pentacene stand up spontaneously on flat surfaces by MD simulations though standing structure is universal in the actual thin films.
Therefore, I changed the strategy of simulations and I started to evaluate the stability of clusters comprising standing pentacene molecules on flat substrate surfaces. It was found that clusters consisting of more than thirty standing molecules could exist stably on hydrophobic flat surfaces more than molecules were necessary for stabilization on hydrophilic flat surfaces and could grow by incorporating surrounding molecules.
Superhydrophilic TiO2 surface without photocatalytic activation. Corrosion Science , 69 , Journal of Physics D: Applied Physics , 42 2 , For each type different hardware configurations and plasma sources. Nanotechnology , 20 18 , Get to Know Us.
Resume : Transparent electrodes, which are optically transparent to visible light and electrically conductive, have been an essential component for liquid crystal displays LCDs , organic light emitting diodes OLEDs , organic photovoltaic OPV cells and touch panels. Currently, indium tin oxide ITO is the most widely utilised transparent electrode due to its excellent optoelectrical properties, comprising of a sheet resistance Rs of 10?
To meet the requirement of current optoelectronic devices, scalable production of high quality electrodes with advanced properties such as high optical transparency and electrical conductivity is vastly demanded via low-cost approaches. In addition to the conductivity and transparency, flexibility is becoming more and more attractive since flexible electrodes have the potential to open new applications and markets. The new applications require transparent electrodes to be flexible, cheap, and compatible with large scale manufacturing methods.
In consideration of these conditions, ITO is a less favourable candidate for future transparent applications due to its high materials cost of indium as well as the high manufacturing cost. Instead, there has been a wide range of materials as alternatives to ITO such as metal nanowires, graphenes and conjugated polymers. As one of the promising alternatives to ITO, AgNW films have been demonstrated to provide high flexibility, high transmittance and low sheet-resistance comparable to that of ITO.
It is easy to deposit AgNW on different substrates via low-cost and scalable manufacturing techniques. Importantly, inkjet printing is a promising technique for large-scale printed flexible and stretchable electronics. However, inkjet printing of silver nanowires AgNWs still presents many challenges. In this study, inkjet printing of high-concentration AgNW ink on flexible substrates is demonstrated. We analyzed the relationship between the surface microstructure and electrical property of the printed AgNW layers.
The high transparent and conductive performance in coupling with the simple and scalable manufacturing process could secure practical products as an alternative to ITO for advanced optoelectronic applications. Surface modification and assembly of transparent indium tin oxide nanocrystals for enhanced conductivity.
J Phys Chem C ;e All-solution-processed indium-free transparent composite electrodes based on Ag nanowire and metal oxide for thin-film solar cells. Adv Funct Mater ;e Highly conductive interwoven carbon nanotube and silver nanowire transparent electrodes.