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Bannenberg, L.J. (author), Verhoeff, D. (author), Jonckers Newton, Nick (author), Thijs, M.A. (author), Schreuders, H. (author)Here, we study the structural and optical properties of tetragonal β-tantalum-sputtered thin films both ex situ and when exposed to hydrogen, with a focus on optical hydrogen sensing applications. Using optical transmission measurements, out-of-plane and in-plane X-ray diffraction, and X-ray and neutron reflectometry, we show that thin film β...journal article 2024
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Giacomelli, Lorenzo (author), Gnann, M.V. (author), Peschka, Dirk (author)We consider the thin-film equation for a class of free boundary conditions modelling friction at the contact line, as introduced by E and Ren. Our analysis focuses on formal long-time asymptotics of solutions in the perfect wetting regime. In particular, through the analysis of quasi-self-similar solutions, we characterize the profile and the...journal article 2023
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Bannenberg, L.J. (author), Schreuders, H. (author), van Beugen, N. (author), Kinane, Christy (author), Hall, Stephen (author), Dam, B. (author)Accurate, cost-efficient, and safe hydrogen sensors will play a key role in the future hydrogen economy. Optical hydrogen sensors based on metal hydrides are attractive owing to their small size and costs and the fact that they are intrinsically safe. These sensors rely on suitable sensing materials, of which the optical properties change...journal article 2023
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Chaykina, D. (author)Rare-earth metal oxyhydride thin films show a photochromic effect, where their transparency decreases (reversibly) with exposure to light with energy greater than its optical band gap. The precise underlying mechanism behind this effect is unknown, but is investigated in this thesis by using techniques such as muon spin relaxation, or materials...doctoral thesis 2022
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Hagendoorn, Y. (author), Pandraud, G. (author), Vollebregt, S. (author), Morana, B. (author), Sarro, Pasqualina M (author), Steeneken, P.G. (author)Since the transfer process of graphene from a dedicated growth substrate to another substrate is prone to induce defects and contamination and can increase costs, there is a large interest in methods for growing graphene directly on silicon wafers. Here, we demonstrate the direct CVD growth of graphene on a SiO2 layer on a silicon wafer by...journal article 2022
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Bannenberg, L.J. (author), Schreuders, H. (author), Dam, B. (author)Hydrogen detection in a reliable, fast, and cost-effective manner is a prerequisite for the large-scale implementation of hydrogen in a green economy. Thin film Ta<sub>1−y</sub>Pd<sub>y</sub> is presented as an effective optical sensing material with extremely wide sensing ranges covering at least 7 orders of magnitude in hydrogen pressure....journal article 2021
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Bannenberg, L.J. (author), Boshuizen, B. (author), Nugroho, Ferry Anggoro Ardy (author), Schreuders, H. (author)Catalyzing capping layers on metal hydrides are employed to enhance the hydrogenation kinetics of metal hydride-based systems such as hydrogen sensors. Here, we use a novel experimental method to study the hydrogenation kinetics of catalyzing capping layers composed of several alloys of Pd and Au as well as Pt, Ni, and Ru, all with and without...journal article 2021
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Gelvez Rueda, M.C. (author), Peeters, Sicco (author), Wang, Peng Cheng (author), Felter, K.M. (author), Grozema, F.C. (author)In this work, we show that the quality of the precursor and the thin film preparation strongly affect the optoelectronic properties of the 2D perovskite BA<sub>2</sub>PbI<sub>4</sub>. 2D perovskites with alkylammonium organic cations such as butylammonium (BA) are relatively soft structures that exhibit large dynamic disorder and phase...journal article 2020
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Tian, Y. (author), Bento Montes, A.R. (author), Vančo, Ľubomír (author), Čaplovičová, Mária (author), Vogrinčič, Peter (author), Šutta, Pavol (author), Satrapinskyy, Leonid (author), Zeman, M. (author), Isabella, O. (author)The knowledge of the structural and compositional details of Si/BaSi<sub>2</sub>/Si heterostructure annealed at high temperature is a prerequisite for BaSi<sub>2</sub> application in heterojunction thin-film solar cells. For this purpose, Si/BaSi<sub>2</sub>/Si heterostructures deposited by magnetron sputtering with different Si layer...journal article 2020
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Bannenberg, L.J. (author), Nugroho, Ferry Anggoro Ardy (author), Schreuders, H. (author), Norder, B. (author), Trinh, Thuy-Trang (author), Steinke, N.J. (author), van Well, A.A. (author), Langhammer, Christoph (author), Dam, B. (author)Nanostructured metal hydrides are able to efficiently detect hydrogen in optical sensors. In the literature, two nanostructured systems based on metal hydrides have been proposed for this purpose each with its own detection principle: continuous sub-100 nm thin films read out via optical reflectance/transmittance changes and nanoparticle arrays...journal article 2019
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Shah, M.S. (author), van Steijn, V. (author), Kleijn, C.R. (author), Kreutzer, M.T. (author)Thermal fluctuations have been shown to influence the thinning dynamics of planar thin liquid films, bringing predicted rupture times closer to experiments. Most liquid films in nature and industry are, however, non-planar. Thinning of such films not just results from the interplay between stabilizing surface tension forces and destabilizing...journal article 2019
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Krishnamurthy, G. (author)Palladium (Pd) metal membranes are used for the production and effective storage of high purity hydrogen. To overcome the crack and de-lamination of Pd membranes at room temperature during several hydrogen loading and de-loading cycles, a Titanium (Ti) of very small thickness of less than 10 nm is introduced as an intermediate layer between the...master thesis 2016
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Resel, Roland (author), Bainschab, Markus (author), Pichler, Alexander (author), Dingemans, T.J. (author), Simbrunner, Clemens (author), Stangl, Julian (author), Salzmann, Ingo (author)Dynamical scattering effects are observed in grazing-incidence X-ray diffraction experiments using an organic thin film of 2,2′:6′,2′′-ternaphthalene grown on oxidized silicon as substrate. Here, a splitting of all Bragg peaks in the out-of-plane direction (z-direction) has been observed, the magnitude of which depends both on the incidence...journal article 2016
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Valdesueiro, D. (author)Particles are widely used in the chemical industry as raw material and end product. In many applications of particles, it is advantageous to give them a coating that can either protect the particle from outside influences or give it an additional function. Technologies to provide micron-sized particles with relatively thick coatings (in the...doctoral thesis 2015
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Valdesueiro Gonzalez, D. (author), Meesters, G.M.H. (author), Kreutzer, M.T. (author), Van Ommen, J.R. (author)We have deposited aluminium oxide films by atomic layer deposition on titanium oxide nanoparticles in a fluidized bed reactor at 27 ± 3 °C and atmospheric pressure. Working at room temperature allows coating heat-sensitive materials, while working at atmospheric pressure would simplify the scale-up of this process. We performed 4, 7 and 15...journal article 2015
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Tran, A.T. (author)Aluminum Nitride (AlN) is explored as a thin film material for piezoelectric MEMS applications. A pulse DC reactive sputtering technique is used to deposit the AlN thin films and process parameters are optimized to obtain good crystallinity and high c-axis orientation films. A CMOS compatible process is developed and employed to fabricate...doctoral thesis 2014
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Anastasopol, A. (author), Eijt, S.W.H. (author), Schut, H. (author), Mulder, F.M. (author), Plazaola, F. (author), Dam, B. (author)Mg-Ti compounds are attractive candidates as hydrogen storage materials for their fast sorption kinetics and high storage capacity. In this context, an investigation of their thermal stability is of great importance. The thermal stability of MgyTi1-y thin films was investigated using positron annihilation spectroscopy. Despite the positive...journal article 2012
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Huang, Y. (author), Pandraud, G. (author), Sarro, P.M. (author)TiO2 is an interesting and promising material for micro-/nanoelectromechanical systems (MEMS/NEMS). For high performance and reliable MEMS/NEMS, optimization of the optical characteristics, mechanical stress, and especially surface smoothness of TiO2 is required. To overcome the roughness issue of the TiO2 films due to crystallization during...journal article 2012
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Davoudi, K.M. (author), Nicola, L. (author), Vlassak, J.J. (author)In this paper, dislocation climb is incorporated in a two-dimensional discrete dislocation dynamics model. Calculations are carried out for polycrystalline thin films, passivated on one or both surfaces. Climb allows dislocations to escape from dislocation pile-ups and reduces the strain-hardening rate, especially for fully passivated films....journal article 2012
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Enache, C.S. (author)For centuries, mankind has mostly used fossil fuels, i.e., natural gas, coal, and oil for its energy needs. With the fast rise of the world population and the rising standards of living in the developing countries, the amount of energy the world is going to need in the coming decades will grow enormously. Due to environmental concerns and the...doctoral thesis 2012