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Patrik Willi Hoffmann

Cette personne a quitté l’EPFL

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Publications associées (42)

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Photonic methods for rapid crystallization of LiMn2O4 cathodes for solid-state thin-film batteries

Patrik Willi Hoffmann

High temperature and prolonged thermal annealing for the crystallization of cathode in thin-film batteries (TFBs) restricts the choice of current collector and substrates and causes lithium loss in the cathode. This work explores photonic-based alternative ...

2021

Combination of Electron or Laser Beam Irradiation with High Vacuum Chemical Vapor Deposition (HV-CVD) of Al2O3 for in-situ Local Structuring on Wafer Scale Substrate

Patrik Willi Hoffmann, Yury Kuzminykh, Xavier Multone

A laser or electron beam assisted deposition in HV-CVD conditions was used in order to achieve structured amorphous alumina (Al2O3) deposits. Selective deposition of Al2O3 in the irradiated regions has been demonstrated. We investigate the influence of irr ...

ECS - The Electrochemical Society2009

Gas assisted focused electron beam induced etching of alumina

Patrik Willi Hoffmann, Tristan Bret

This study investigates focused electron beam induced etching for the removal of alumina particles on patterned extreme ultra violet (EUV) mask using nitrosyl chloride (NOCl) as assist gas. As potential contaminant, particles of aluminum oxide (alumina, Al ...

2009

Electron beam-based direct writing of nanostructures using a palladium β-ketoesterate complex

Chinmai Sai Jureddy, Patrik Willi Hoffmann

Gas-assisted focused electron beam-induced deposition (FEBID) as a direct, minimally invasive 3D nanopatterning tool offers many advantages in making nanostructures with complex shapes and novel compositions for evolving nanotechnological applications. In ...

BEILSTEIN-INSTITUT2025

The Serotonin receptor 3E subunit variant HTR3E c.*76G> A is confirmed as a risk factor for IBS-D in females

Patrik Willi Hoffmann, Christian Hammer

WILEY2018

Hierarchical positioning of gold nanoparticles into periodic arrays using block copolymer nanoring templates

Patrik Willi Hoffmann

We report a simple and versatile self-assembly method for controlling the placement of functional gold nanoparticles on silicon substrates using micellar templates. The hierarchical positioning of gold nanoparticles is achieved in one-step during the spont ...

2011

Chemical Vapor Deposition Kinetics and Localized Growth Regimes in Combinatorial Experiments

Patrik Willi Hoffmann, Ali Dabirian, Giacomo Benvenuti, Estelle Wagner, Yury Kuzminykh

Laser-assisted deposition: The discovery of chemical vapor deposition (CVD) conditions under which the growth rate is a decreasing function of the precursor flux has the potential to boost the resolution of laser-assisted CVD processes whereas flux- and de ...

2011

Surface Reaction Kinetics of Titanium Isopropoxide and Water in Atomic Layer Deposition

Patrik Willi Hoffmann, Michael Oliver Reinke, Yury Kuzminykh

In atomic layer deposition processes (ALD), surface reactions of adsorbed precursor species lead to the formation of thin films. In order to achieve a well-controlled, self-limiting process, the substrate is sequentially exposed to different precursor mole ...

American Chemical Society2016

Beam-induced etching of material on substrate involves directing gaseous compound which reacts in the presence of beam to etch the excess material which not etching the substrate

Patrik Willi Hoffmann, Tristan Bret, Xavier Multone

A method and apparatus for local beam processing using a beam activated gas to etch material are described. Compounds are disclosed that are suitable for beam-induced etching. The invention is particularly suitable for electron beam induced etching of chro ...

FEI CO (FEIF-Non-standard)2005

High-quality epitaxial BaTiO3 films grown by high-vacuum chemical vapor deposition for integrated electro-optical devices

Patrik Willi Hoffmann, Wojciech Bozydar Szmyt

Synthesizing high-quality epitaxial BaTiO3 (BTO) by means of high-vacuum chemical vapor deposition (HV-CVD) requires a precise control over precursor fluxes impinging onto the heated substrate surface so that the incorporation rates of all elements corresp ...

2025

Cross section investigations of compositions and sub-structures of tips obtained by focused electron beam induced deposition

Philippe Buffat, Patrik Willi Hoffmann, Christian Santschi, Marco Cantoni, Johann Michler, Danièle Laub, Ivo Utke

The spatial evolution of compositions and sub-structures inside focused-electron-beam-deposited tips from dicobalt-octacarbonyl Co2(CO)8 precursor at 25 keV and varying beam current (20 pA - 3 A) is extensively studied for the first time by means of energy ...

2005

Combinatorial Discovery and Optimization of Amorphous HfO2-Nb2O5 Mixture with Improved Transparency

Paul Muralt, Patrik Willi Hoffmann, Silviu Cosmin Sandu, Ali Dabirian, Giacomo Benvenuti, Estelle Wagner, Yury Kuzminykh, Scott Harada

Combinatorial high vacuum chemical vapor deposition (HV-CVD) of mixed HfO2-Nb2O5 thin films has been demonstrated to yield amorphous layers at substrate temperatures where individually deposited pure HfO2 and Nb2O5 films are polycrystalline. Spectroscopic ...

Electrochemical Society2010

Two-dimensional electrostatic force field measurements with simultaneous topography measurement on embedded interdigitated nanoelectrodes using a force distance curve based method

Patrik Willi Hoffmann, Christian Santschi

Accurate simultaneous measurements on the topography and electrostatic force field of 500 nm pitch interdigitated electrodes embedded in a thin SiO2 layer in a plane perpendicular to the orientation of the electrodes are shown for the first time. A static ...

AIP American Institute of Physics2008

Electroosmotic Flow in Composite Microchannels and Implications in Microcapillary Electrophoresis Systems

Hubert Girault, Patrik Willi Hoffmann, François Bianchi, Frank Rüdiger Wagner

The electroosmotic flow in laminated excimer laser-ablated microchannels has been studied as a function of the depth of the rectangular channels, and particular emphasis has been given to the difference in the ζ-potentials between the lamination layer and ...

2001

Submicrometer Hall devices fabricated by focused electron-beam-induced deposition

Jürgen Brugger, Niels Quack, Giovanni Boero, Patrik Willi Hoffmann, Radivoje Popovic, Pavel Kejik, Schahrazede-Lila Mouaziz, Tristan Bret

Hall devices having an active area of about (500 nm)2 are fabricated by focused electron-beam-induced deposition. The deposited material consists of cobalt nanoparticles in a carbonaceous matrix. The realized devices have, at room temperature, a current se ...

2005

Gold nanoring arrays from responsive block copolymer templates

Patrik Willi Hoffmann

We report a pH-mediated synthetic route for the production of ordered and size-tuneable arrays of gold nanorings using responsive block copolymer micelles as templates. ...

Royal Society of Chemistry2009

Confining the sampling volume for Fluorescence Correlation Spectroscopy using a sub-wavelength sized aperture

Olivier Martin, Theo Lasser, Patrik Willi Hoffmann, Marcel Leutenegger, Alexandre Perentes

For the observation of single molecule dynamics with fluorescence fluctuation spectroscopy (FFS) very low fluorophore concentrations are necessary. For in vitro measurements, this requirement is easy to fulfill. In biology however, micromolar concentration ...

2006

Easy release fluoropolymer molds for micro- and nano-pattern replication

Patrik Willi Hoffmann, Hans Jörg Mathieu

A mold (35) for use in nano- or micro-replication processes on thermoplastic polymer substrates (20), comprises a nano- or micro-structured fluoropolymer surface that, when the mold (35) is used in a nano- or micro-replication process, serves for the appli ...

2006

Determination of local refractive index variations in thin films by heterodyne interferometric scanning near-field optical microscopy

Patrik Willi Hoffmann, Ali Dabirian, Giacomo Benvenuti, Yury Kuzminykh

We report on a heterodyne interferometric scanning near-field optical microscope developed for characterizing, at the nanometric scale, refractive index variations in thin films. An optical lateral resolution of 80 nm (lambda/19) and a precision smaller th ...

American Institute of Physics2009

Optimization of Ca Precursor Transport for High Vacuum Chemical Vapor Deposition (HV-CVD)

Patrik Willi Hoffmann, Yury Kuzminykh

2009