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Publications associées (144)

Nanocrystalline Low-Refractive Magnesium Fluoride Films Deposited by Reactive Magnetron Sputtering: Optical and Structural Properties

Jean-Louis Scartezzini, Paul Muralt, Silviu Cosmin Sandu, Stefan Mertin

In this work, we study MgF2 thin-film synthesis by reactive pulsed DC magnetron sputtering from a metallic magnesium target in a gas mixture of argon, oxygen, and carbon tetrafluoride (CF4). Nanocrystalline films on silicon and glass substrates with excell ...

Wiley-Blackwell2015

A thermally self-sustained micro-power plant with integrated micro-solid oxide fuel cells, micro-reformer and functional micro-fluidic carrier

Paul Muralt, Thomas Maeder, Alex Dommann, Bo Jiang, Claude Muller

Low temperature micro-solid oxide fuel cell (micro-SOFC) systems are an attractive alternative power source for small-size portable electronic devices due to their high energy efficiency and density. Here, we report a thermally self-sustainable reformer – ...

Elsevier2014

Syngas generation from n-butane with an integrated MEMS assembly for gas processing in micro-solid oxide fuel cell systems

Paul Muralt, Thomas Maeder, Bo Jiang

An integrated system of a microreformer and a carrier allowing for syngas generation from liquefied petroleum gas (LPG) for micro-SOFC application is discussed. The microreformer with an overall size of 12.7 mm × 12.7 mm × 1.9 mm is fabricated with micro-e ...

Royal Soc Chemistry2012

Key-features in processing and microstructure for achieving giant electrostriction in gadolinium doped ceria thin films

Paul Muralt, Silviu Cosmin Sandu, Mahmoud Hadad

Gadolinium doped ceria is a well-known oxygen ion conduction material for solid fuel cell electrolytes. With its centrosymmetric average lattice and relatively low bulk dielectric constant it does not look interesting for electromechanical applications. Ho ...

Elsevier2016

Measurement of effective piezoelectric coefficients of PZT thin films for energy harvesting application with interdigitated electrodes

Paul Muralt, Andrea Mazzalai, Nachiappan Chidambaram

Interdigitated electrode (IDE) systems with lead zirconate titanate (PZT) thin films play an increasingly important role for two reasons: first, such a configuration generates higher voltages than parallel plate capacitor-type electrode (PPE) structures, a ...

Institute of Electrical and Electronics Engineers2012

Al0.83Sc0.17N Contour-Mode Resonators With Electromechanical Coupling in Excess of 4.5%

Paul Muralt, Luis Guillermo Villanueva Torrijo, Andrea Lozzi

In this paper, we demonstrate the fabrication of contour-mode resonators (CMRs) with Al0.83Sc0.17N as a piezoelectric layer. Moreover, we assess the electromechanical coupling and the maximum achieved quality factor from 150 to 500 MHz. In comparison to pu ...

2019

Design and packaging of a highly integrated microreactor system for high-temperature on-board hydrogen production

John Richard Thome, Paul Muralt, Thomas Maeder, Navid Borhani, Bo Jiang

Highlights • A “plug-and-play” microreaction system for high-temperature reactions (>500 °C). • Efficient thermal decoupling for using standard electrical/fluidic connections. • Automatic and accurate temperature control for calorimetric measurements. • A ...

Elsevier2015

Fabrication de capteurs pyroelectriques comprenant une couche pyroelectrique mince necessitant une polarisation electrique

Paul Muralt

The method for group manufacturing of pyroelectric sensors by forming a thin pyroelectric layer on the upper side of a silicon wafer, where each sensor comprises several pixels (4) and each pixel is defined by an upper electrode (6) situated on the face si ...

2006

Controlled Electronic and Magnetic Landscape in Self-Assembled Complex Oxide Heterostructures

Mihai Adrian Ionescu, Paul Muralt, Daesung Park, Kanghyun Chu

Complex oxide heterointerfaces contain a rich playground of novel physical properties and functionalities, which give rise to emerging technologies. Among designing and controlling the functional properties of complex oxide film heterostructures, verticall ...

Wiley-V C H Verlag Gmbh2023

Annealing effects on electrical properties and defects of CaCu_{3}Ti_{4}O_{12} thin films deposited by pulsed laser deposition

Paul Muralt

A systematic study was carried out to assess property changes in CaCu3Ti4O12 thin films upon annealing in air in order to evaluate the impact of oxygen vacancies on their colossal dielectric constant behavior. Highly preferentially oriented thin-film sampl ...

2010

Microstructure and dielectric properties of piezoelectric magnetron sputtered w-ScxAl1-xN thin films

Paul Muralt, Ramin Matloub Aghdam

Piezoelectric wurtzite ScxAl1-xN (x = 0, 0.1, 0.2, 0.3) thin films were epitaxially grown by reactive magnetron co-sputtering from elemental Sc and Al targets. Al2O3(0001) wafers with TiN(111) seed and electrode layers were used as substrates. X-ray diffra ...

American Institute of Physics2012

Micro-solid state energy conversion membranes: influence of doping and strain on oxygen ion transport and near order for electrolytes

Paul Muralt

Enhancing the efficiency of micro-energy conversion devices through engineering of the structure-transport relationship is a prerequisite toward next generation micro-electrolysers and fuel cells. Here, oxygen ion conducting free-standing thin films are ke ...

Royal Society of Chemistry2017

Self-Poled Heteroepitaxial Bi(1-x)DyxFeO3 Films with Promising Pyroelectric Properties

Paul Muralt

Pyroelectric materials are very promising for thermal energy harvesting applications. To date, lead-based systems are the foremost studied materials in this field. A facile and simple metal organic chemical vapor deposition route is applied for the fabrica ...

2022

Experimental study of single triple-phase-boundary and platinum-yttria stabilized zirconia composite as cathodes for micro-solid oxide fuel cells

Paul Muralt, Silviu Cosmin Sandu, Yan Yan

Micro-solid oxide fuel cell (mu SOFC) structures with annular Pt electrodes have been fabricated by means of silicon micromachining. The annular cathodes contained a defined triple phase boundary (TPB) length, which allowed the derivation of the ionic curr ...

2012

Structural and dielectric properties of strain-controlled epitaxial SrTiO3 thin films by two-step growth technique

Nava Setter, Paul Muralt, Alexander Tagantsev, Konstantin Astafiev

Structural and dielectric properties of epitaxial SrTiO3 (STO) thin films on LaAlO3 substrates fabricated by a two-step growth technique using pulsed laser deposition were investigated by in situ and ex situ observations in terms of strain relaxation from ...

2005

Strain relaxation of epitaxial SrTiO3 thin films on LaAlO3 by two-step growth technique

Nava Setter, Paul Muralt, Alexander Tagantsev, Konstantin Astafiev

Using pulsed-laser deposition, a two-step growth technique was applied to epitaxial SrTiO3 (STO) thin films on LaAlO3 substrates providing a way to obtain an effective strain relaxation in these films otherwise strained due to lattice mismatch between film ...

2005

Physical aspects of colossal dielectric constant material CaCu3Ti4O12 thin films

Paul Muralt

The underlying physical mechanism of the so-called colossal dielectric constant phenomenon in CaCu3Ti4O12 CCTO thin films were investigated by using semiconductor theories and methods. The semiconductivity of CCTO thin films originated from the acceptor de ...

2009

Tailoring dielectric permittivity of epitaxial Gd-doped CeO2-x films by ionic defects

Paul Muralt

Engineering materials with highly tunable physical properties in response to external stimuli is a cornerstone strategy for advancing energy technology. Among various approaches, engineering ionic defects and understanding their roles are essential in tail ...

Iop Publishing Ltd2024

Material Parameter Extraction for Complex AlScN Thin Film Using Dual Mode Resonators in Combination with Advanced Microstructural Analysis and Finite Element Modeling

Paul Muralt, Thomas La Grange, Vladimir Pashchenko, Fazel Parsapour, Silviu Cosmin Sandu

Accurate property determination of the piezoelectric thin film material Al(1-x)Sc(x)N is necessary for designing the next generation of radio frequency resonators in mobile communication, and for testing results of ab initio calculations. Sound velocity an ...

WILEY2019

Nanoporous YSZ film in electrolyte membrane of Micro-Solid Oxide Fuel Cell

Paul Muralt, Silviu Cosmin Sandu, Yan Yan, Samuel Rey-Mermet

Yttria stabilized zirconia (YSZ) with 8 mol% Y was deposited by reactive magnetron sputtering onto oxidized (100) silicon substrates. It was possible to switch film texture from (111) to (200) by applying a strong RF substrate bias. Transmission electron m ...

2010