Conveners
Thin Films & Surface Engineering: 1
- Matjaz Panjan (Jozef Stefan Institute)
Thin Films & Surface Engineering: 1
- Matjaz Panjan (Jozef Stefan Institute)
Thin Films & Surface Engineering: 2
- Ming Show Wong (National Dong Hwa University)
Thin Films & Surface Engineering: 2
- Ming Show Wong (National Dong Hwa University)
Thin Films & Surface Engineering: 3
- Daniel Lundin (Paris-Sud University/CNRS)
Thin Films & Surface Engineering: 3
- Daniel Lundin (Paris-Sud University/CNRS)
Thin Films & Surface Engineering: 4
- Pedro Nascente (UFSCar)
Thin Films & Surface Engineering: 4
- Pedro Nascente (UFSCar)
Thin Films & Surface Engineering: 5
- Jörg Patscheider (Evatec AG)
Pulsed Laser Deposition, PLD, is a flexible and low-cost thin film deposition method, widely used for the preparation of insulating, semiconducting and metallic thin films with thickness ranging from a few nanometers up to tens of microns.
In the present contribution we will describe our work during the past 15 years employing this method at IST, Lisbon. Straight-forward PLD was combined...
TiBN ternary coatings are of great industrial value, considering their prominent mechanical and tribological properties, such as super hardness, low intrinsic stress and high wear resistance. These coatings have been successfully applied to cutting tools, die-casting moulds, forging dies, aluminium extrusion dies, etc. Therefore, for these applications, the thermal stability and oxidation...
Ultrananocrystalline diamond (UNCD) films consist of small randomly oriented diamond grains embedded in an amorphous C:H matrix. Usually, the grain size is determined by X-ray diffraction or transmission electron microscopy, revealing information only from the total UNCD film or only locally from selected areas with low statistics, respectively. In this work, we present the first...
Nanostructured hard coatings exhibit complicated structure-property relationships which originate from their microstructure, phase and residual stress variations at the nanoscale. In this contribution, a multi-layered coating composed of equally thick soft hexagonal (h) Al90Cr10N and metastable hard cubic (c) Al63Cr27Si10N sublayers, with...
TiBx thin films grown from compound TiB2 targets by magnetron sputter deposition are typically highly over-stoichiometric, with x ranging from 2.4 to 3.5, due to differences in Ti and B preferential ejections angles and gas-phase scattering during transport between the target and the substrate. We show that the use of highly-magnetically-unbalanced magnetron sputtering of TiB2 target leads to...
To explore the influence of activation temperatures on the operation and lifetime of non-evaporable getter coatings, films were annealed at different temperatures to monitor phase formation which was correlated with activation and pumping characteristics. TiZrV films were deposited on cylindrical stainless steel vacuum chambers, as well as oxygen-free electronic (OFE) copper and silicon...
ZnO nanorod-based devices have been of increasing interest in the field of flexible electronics, catalyst, optoelectronics and energy harvesting. These devices usually contain Zinc oxide film as a seed layer for nanorods and Indium tin oxide (ITO) film as transparent electrode. Since Indium is included in the list of critical raw materials defined by EU commission, research and development...
Plasma-assisted PVD processes for thin film growth allow for tailoring the film functionalities via controlling the plasma properties. Magnetron sputtering is a widely employed PVD method for preparing functional thin films that cover a wide range of applications from solar cells to hard coatings. An emerging magnetron sputtering based method is high power impulse magnetron sputtering (HiPIMS)...
The most important criteria to develop metallic materials for manufacturing biomedical implants are the absence of toxic elements and a low modulus of elasticity. The metallic biomaterials mostly used as implants are stainless steel (SS), Co-Cr alloys, and Ti-based alloys due to their good mechanical properties, biocompatibility, high corrosion and wear resistance, and osseointegration. The...
The surface modification of a TiN coated steel was conducted by ion beam dynamic mixing (IBDM) with an ion energy of 70 keV and boron vapor deposition in order to investigate the mixing phenomena and to produce a mixed layer consisting of boron, titanium and nitrogen. The modified surface prepared at a boron/ion arrival ratio less than 2.2 has a convex-concave shape having a striped habit. It...
Electro-magnetic transparent decorative coatings with a metallic appearance are highly desirable for military, automotive and communication applications. Inherently, a metallic film interferes with electro-magnetic radiation rendering it unsuitable for these applications. Hence, metal-semiconductor alloy thin films were investigated, as their electro-magnetic transparency and optical...
Ion beam assisted deposition (IBAD) enables the engineering of thin film properties by tuning the mobility of adatoms and controlled defect generation during thin film growth. Utilizing ions of hyperthermal kinetic energy in the range of a few 1 eV up to only a few 100 eV the influence of impinging ions on a solid material is limited to the near surface region and hence allows the deposition...
In the vacuum surface engineering sector, ionized PVD and PE-CVD techniques are currently attracting a high degree of attention in producing high quality tribological surfaces with low friction, which exhibit high wear and corrosion resistance. Economical production for such high-quality surfaces is a significant driving factor for sustainable growth in coating manufacturing. In this...
2D-TMD (transition metal dichalcogenide) materials are potential channel candidates for future semiconducting applications. There are various challenges facing the implementation 2D TMDs into high performance transistors. Key among these issues is the development of a scalable gate dielectric formation and its influence on TMD channel performance. In this presentation four deposition...
Highly piezoelectric wurtzite-type Al$_{1-x}$Sc$_{x}$N thin films (d$_{33}$=27.6 pC/N for x=0.43 [1]) are a promising alternative to AlN in different microelectromechanical systems (MEMS), such as surface acoustic wave (SAW) or thin film bulk acoustic wave resonators (TFBAR) used in RF filtering, sensing, and energy harvesting applications, allowing smaller and more efficient devices to be...
The potential to produce adequate Al/AlN films to be used in acoustic biosensors via deep oscillation magnetron sputtering (DOMS) and direct current magnetron sputtering (d.c. MS) was compared. The films were deposited on 304L stainless steel substrates and extensively characterized by scanning electron microscopy + energy dispersive microanalysis, glancing angle x-ray diffraction, and...
The bulk metallic glasses BMGs discovered in 1960, are very promising for structural and other applications. The searches for the mechanisms formation, thermal stability, origins of their ductility/brittleness and relationship between density, elastic/plastic properties, local chemical ordering and glass forming ability (GFA) are the hottest topics in the undergoing research of amorphous...
All thin films and engineered surface layers inherently exhibit marked through-thickness property gradients. The complexity of these gradients varies greatly, ranging from the simplest case of a nucleation layer at a substrate interface, to intricately taylored multilayer architectures comprising many different materials, phases and microstructures at multiple levels of hierarchy. In order to...
Apart from the widely applied chemical vapor phase epitaxy and conventional molecular-beam epitaxy (MBE) there exist other methods to prepare thin epitaxial compound (nitride) films or nanostructures like the ion-beam assisted deposition (IBAD) technique. IBAD is a hybrid physical thin film deposition technique which on the one hand offers the opportunity to investigate fundamental processes...
Film and substrate mechanical integrity is essential for the whole system’s performance. In the present study, cracking of brass ductile substrate induced by brittle TiN film fracture was observed. Counter-intuitively, instead of protecting the ductile substrate, a brittle film can cause its premature fracture, as demonstrated here experimentally. Brittle film fracture could induce cracking of...
Hydrogen can be stored in a hybrid system consisting of hydrogen pressurized hollow glass microspheres (HGMS) and a hydride, e.g. NaBH4. Storage involves heating and pressurizing the spheres at approx. 85 MPa, forcing the gas into the them. Hydrogen is released by heating again to approx. 250°C. To reach this temperature the exothermal chemical reaction of NaBH4 with water, which produces...
The LHC successfully returned to operation in April 2015 after almost 2 years of Long Shutdown 1 (LS1) for various upgrade and consolidation programs. During the machine operation, in Run 2 (2015 - 2017), the LHC operated for more than 3000 fills and reached a total integrated luminosity of 125 fb-1 since the start of the LHC (up to end 2017).
This paper summarizes the dynamic vacuum...
Ti-Zr-B films including TiB2-Zr composite, TiZrB2 solid solution, and TiB2/ZrB2 multilayer films were deposited by co-sputtering targets of TiB2 and Zr as well as TiB2 and ZrB2 under various substrate bias voltages. Zr and Ti are in the same group in the periodic table. Zr/Ti atoms may occupy either substitutional or interstitial positions in the lattice forming (TixZr1-x)B2 solid solution....
Friction at hydrophobic surfaces in aqueous media is ubiquitous (e.g. prosthetic implants, contact lenses), but is not well understood. Here we measure directly both normal forces and sliding friction in an aqueous environment between a hydrophilic surface (single-crystal mica) and a stable, smooth, strongly hydrophobic surface (a spin-cast fluoropolymer film), using a surface force balance....
Recently, an increasing trend has been noticed towards synthesizing superhydrophobic surface with a water contact angle (WCA) higher than 150° due to its many potential applications including water repellency, oil spill recovery, self-cleaning, antifouling, anti-icing-deicing and so on. Unfortunately, most of the cases the superhydrophobic surface was achieved utilizing either fluorinated...
Surfactants are widely used to modify surfaces and interfaces properties. Unique cationic trimeric surfactant was found to form liposome-like aggregates in solution (1, 2). The surface structure of the trimeric surfactant tri(dodecyldimethylammonioacetoxy)-diethyltriamine trichloride (DTAD) on mica, and the interactions between two such DTAD-coated surfaces were determined using atomic force...
Radio-Frequency (RF) contacts are key components on the International Thermonuclear Experimental Reactor (ITER) Ion Cyclotron Resonance Heating (ICRH) antenna, and these components are facing big challenges such as 2kA operation current load and severe wear at around 200 ºC in high vacuum. Stainless steel 316L and CuCrZr are proper candidates to be applied as the base materials for the...
