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Surface physics with single-layer materials and molecular layers

English title Surface physics with single-layer materials and molecular layers
Applicant Osterwalder Jürg
Number 172641
Funding scheme Project funding (Div. I-III)
Research institution Physik-Institut Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Condensed Matter Physics
Start/End 01.04.2017 - 31.03.2021
Approved amount 839'027.00
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All Disciplines (2)

Discipline
Condensed Matter Physics
Physical Chemistry

Keywords (12)

water splitting; scanning probes; electron dynamics; photoemission; molecular films; ambient pressure XPS; molecular catalysts; boron nitride; femtosecond lasers; magnetic molecules; graphene; 2D materials

Lay Summary (German)

Lead
In diesem Projekt werden zwei Arten von Systemen mit modernen Methoden der Oberflächenphysik untersucht. Zum einen sind dies künstliche Schichtstrukturen aus zweidimensionalen Materialien wie Graphen oder Bornitrid, welche je als Monolagen auf Metallsubstraten synthetisiert, mit Hilfe von Polymer-Trägerfilmen elektrochemisch abgelöst und dann kontrolliert gestapelt werden. Solche Stapelstrukturen können heute nur mit submillimeter grossen, exfoliierten Proben hergestellt werden, welche für eine Hochskalierung der Produktion nicht geeignet sind. Zum andern werden Modellkatalysatoren für die photoelektrochemische Wasserspaltung untersucht, ausgehend von molekularen Katalysatoren welche auf einkristallinen Oxidoberflächen immobilisiert sind. Es geht darum, mechanistische Einblicke in die relevanten Ladungstransferprozesse zu erhalten und dadurch Strategien zur Optimierung der Energiekonversionseffizienz und der Langzeitstabilität solcher Elektrodenoberflächen zu entwickeln.
Lay summary

Inhalt und Ziel des Forschungsprojekts

Die Forschungsgruppe baut an der Swiss Light Source zusammen mit dem PSI und der ETH eine neue Messstation auf, mit welcher chemische Oberflächenanalytik an fest-flüssig-Grenzflächen unter Reaktionsbedingungen durchgeführt werden kann. Damit sollen die Prozesse während der elektrochemischen Delamination von Graphen und Bornitrid von Metalloberflächen im Detail untersucht werden, um zu verstehen weshalb und wie stark die Qualität dieser ultradünnen Filme unter diesen Bedingungen leidet, und um sie allenfalls verbessern zu können. In dieser Messstation werden weiter elektrochemische Reaktionen an Modellelektroden angeschaut, welche bei Lichteinfall zur Bildung von Wasserstoffgas führen. Die benutzte Photoelektronenspektroskopie-Methode liefert direkte Information über die Ladungszustände der katalytisch relevanten Zentren. Parallel dazu wird die Ladungstransfer-Dynamik mit Hilfe von lasergestützten Photoemissionsexperimenten studiert. Das Ziel ist ein mikroskopisches Verständnis dieser Prozesse und deren Optimierung.

Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojekts

Kontrolliert hergestellte künstliche Schichtstrukturen von Graphen und Bornitrid wären attraktive Ausgangsmaterialien für die Elektronik und Sensorik. Die ebenfalls untersuchten Modellkatalysatoren dienen dem Ziel, die Konversion von Sonnenlicht in chemische Energie mittels Wasserspaltung zu optimieren.

Direct link to Lay Summary Last update: 05.04.2017

Responsible applicant and co-applicants

Employees

Project partner

Publications

Publication
Dynamics of excited interlayer states in hexagonal boron nitride monolayers
Hengsberger Matthias, Leuenberger Dominik, Schuler Adrian, Roth Silvan, Muntwiler Matthias (2020), Dynamics of excited interlayer states in hexagonal boron nitride monolayers, in Journal of Physics D: Applied Physics.
Catalyst Proximity-Induced Functionalization of h-BN with Quat Derivatives
Hemmi Adrian, Cun Huanyao, Tocci Gabriele, Epprecht Adrian, Stel Bart, Lingenfelder Magalí, de Lima Luis Henrique, Muntwiler Matthias, Osterwalder Jürg, Iannuzzi Marcella, Greber Thomas (2019), Catalyst Proximity-Induced Functionalization of h-BN with Quat Derivatives, in Nano Letters, 19(9), 5998-6004.
An electron acceptor molecule in a nanomesh: F4TCNQ on h-BN/Rh(111)
Cun Huanyao, Seitsonen Ari Paavo, Roth Silvan, Decurtins Silvio, Liu Shi-Xia, Osterwalder Jürg, Greber Thomas (2018), An electron acceptor molecule in a nanomesh: F4TCNQ on h-BN/Rh(111), in Surface Science, 678, 183-188.
Electronic Properties of Transferable Atomically Thin MoSe 2 /h-BN Heterostructures Grown on Rh(111)
Chen Ming-Wei, Kim HoKwon, Bernard Carlo, Pizzochero Michele, Zaldıvar Javier, Pascual Jose Ignacio, Ugeda Miguel M., Yazyev Oleg V., Greber Thomas, Osterwalder Jürg, Renault Olivier, Kis Andras (2018), Electronic Properties of Transferable Atomically Thin MoSe 2 /h-BN Heterostructures Grown on Rh(111), in ACS Nano, 12(11), 11161-11168.
Centimeter-Sized Single-Orientation Monolayer Hexagonal Boron Nitride With or Without Nanovoids
Cun Huanyao, Hemmi Adrian, Miniussi Elisa, Bernard Carlo, Probst Benjamin, Liu Ke, Alexander Duncan T. L., Kleibert Armin, Mette Gerson, Weinl Michael, Schreck Matthias, Osterwalder Jürg, Radenovic Aleksandra, Greber Thomas (2018), Centimeter-Sized Single-Orientation Monolayer Hexagonal Boron Nitride With or Without Nanovoids, in Nano Letters, 18(2), 1205-1212.

Collaboration

Group / person Country
Types of collaboration
Roger Alberto, Institut für Chemie, UZH Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Zbynek Novotny, Swiss Light Source, Paul Scherrer Institut Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Marcella Iannuzzi, Institut für Chemie, UZH Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Matthias Schreck, Experimentalphysik IV, Universität Augsburg Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
David Tilley, Institut für Chemie, UZH Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
6th Annual Ambient Pressure X-Ray Photoelectron Spectroscopy Workshop 2019 Poster Probing solit-liquid interfaces with tender x-rays 11.12.2019 Lund, Sweden Comini Nicolo';
AVS 66th International Symposium and Exhibition 2019 Poster Probing solid-liquid interfaces with tender x-rays 24.10.2019 Columbus OH, United States of America Comini Nicolo';
DPG Frühjahrstagung Talk given at a conference Electronic properties of cobalt-pyrphyrin on cuprous oxide 04.04.2019 Regensburg, Germany Grad Lisa;
5th Annual Ambient Pressure X-Ray Photoelectron Spectroscopy Workshop 2018 Talk given at a conference New APXPS endstation at the SLS for the study of model catalysts 13.12.2018 Berlin, Germany Osterwalder Jürg;
International Symposium on Ultrafast Science (ISUS) Poster Electron dynamics of systems for photocatalytic water splitting 28.11.2018 Lausanne, Switzerland Grad Lisa;
EMPA / Division Seminar Transport in Nanoscale Systems Individual talk Ultrafast electron and structural dynamics at surfaces 02.10.2018 Dübendorf, Switzerland Osterwalder Jürg;
Electron Dynamics in Solids (Summer School) Poster Electron dynamics of systems for photocatalytic water splitting 19.09.2018 Göttingen, Germany Grad Lisa;
International Conference on Novel 2D Materials Explored Via Scanning Probe Microscopy and Spectroscopy Talk given at a conference A closer look at electrochemically transferred 2D materials 29.06.2018 Donistia, Spain Osterwalder Jürg;
DPG Frühjahrstagung Poster Cobalt-pyrphyrin on Cu2O(111) - a model system for photocatalytic water splitting 14.03.2018 Berlin, Germany Grad Lisa;
Non-Equilibrium Dynamics of Condensed Matter in the Time Domain (Summer School) Poster Two-photon photoemission on systems for photocatalytic water splitting 09.08.2017 St. Peter Ording, Germany Grad Lisa;


Associated projects

Number Title Start Funding scheme
153312 Surface physics with single-layer materials and molecular layers 01.04.2014 Project funding (Div. I-III)
170747 Ambient pressure XPS for operando studies of (photoelectro)chemical reactions at the solid-liquid interface 01.01.2017 R'EQUIP

Abstract

This proposal asks for funding for 3 Ph.D. students over a period of 48 months. It covers the following three projects:A) Transfer and stacking of single layer materialsExploiting the capacity for wafer-scale growth of h-BN monolayers and graphene on single-crystal metal surfaces and successful transfer of these films to arbitrary substrates, this projects aims to develop a materials platform for stacking macroscopic areas of 2D materials in a controlled way. Using surface science techniques, the crystal and electronic structure and the quality of these heterostacks will be characterized. Using ambient pressure XPS, the intercalation-assisted transfer procedure will be monitored in situ at the film-electrolyte interface in order to optimize the process parameters.B) Electron dynamics from time- and angle-resolved photoelectron spectroscopyThis project covers the last year of the PhD project of Adrian Schuler. He is currently commissioning the HHG source for femtosecond time-resolved photoemission experiments with photon energies of 20 eV. Once this is successfully achieved, the study of the generation, transfer times and decay rates of valley polarization in suitable materials like single layer hexagonal boron nitride can proceed. Starting with flat films of h-BN grown on Ni(111) we will study the selective population of valleys and inter-valley scattering in h-BN as function of film flatness and surface reconstruction.C) Surface science studies of molecular model catalystsProfiting from a university funded research priority program on solar water splitting, the group has embarked in a new line of research three years ago: model catalyst surfaces based on semiconductor surfaces and novel water reduction and water oxidation catalysts as well as photosensitizers are prepared and studied by surface science techniques. In order to increase the relevance of these studies, which are currently conducted in the UHV environment, we request one PhD position for performing ambient pressure XPS studies at photoelectrode-water interfaces. A second PhD position from project years 2-4 would secure the continued operation of the HHG source (Project B) for the study of the electron dynamics during light-induced charge transfer processes.
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