Publications associées à High-frequency multimodal atomic force microscopy

III-N blue-emitting epi-structures with high densities of dislocations: Fundamental mechanisms for efficiency improvement and applications

Since the dawn of humanity, human beings seeked to light their surroundings for their well-being, security and development. The efficiency of ancient lighting devices, e.g. oil lamps or candles, was in the order of 0.03-0.04% and jumped to 0.4-0.6% with th ...

EPFL2024

Atomic-scale Characterization of Strain and Gate effects on Two-dimensional Materials by Scanning Tunneling Microscopy

Jz -Yuan Juo

Strain is an inevitable phenomenon in two-dimensional (2D) material, regardless of whether the film is suspended or supported. Moreover, strain is known to alter the physical and chemical properties, such as the band gap, charge carrier effective masses, d ...

EPFL2023

Local stiffness and work function variations of hexagonal boron nitride on Cu(111)

Klaus Kern, Markus Ternes, Abhishek Grewal

Combined scanning tunnelling and atomic force microscopy using a qPlus sensor enables the measurement of electronic and mechanic properties of two-dimensional materials at the nanoscale. In this work, we study hexagonal boron nitride (h-BN), an atomically ...

BEILSTEIN-INSTITUT2021

Correlative 3D microscopy of single cells using super-resolution and scanning ion-conductance microscopy

Aleksandra Radenovic, Adrien Charles-François Raymond Descloux, Georg Fantner, Samuel Mendes Leitão, Kristin Stefanie Grussmayer, Barney Frederick Drake, Vytautas Navikas

High-resolution live-cell imaging is necessary to study complex biological phenomena. Modern fluorescence microscopy methods are increasingly combined with complementary, label-free techniques to put the fluorescence information into the cellular context. ...

Nature Research2021

Direct observation of water-mediated single-proton transport between hBN surface defects

Aleksandra Radenovic, Benoît Grosjean, Jean Camille Benjamin Comtet, Evgenii Glushkov, Ahmet Avsar

Super-resolution microscopy of defects in a two-dimensional material unveils the transport of single proton charges at solid/water interfaces. Aqueous proton transport at interfaces is ubiquitous and crucial for a number of fields, ranging from cellular tr ...

2020

High-quality single crystal diamond diffraction gratings fabricated by crystallographic etching

Christian Santschi, Niels Quack, Olivier Martin, Toralf Scharf, Marcell Kristof Kiss, Teodoro Graziosi

We demonstrate a novel method for fabricating single crystal diamond diffraction gratings based on crystallographic etching that yields high-quality diffraction gratings from commercially available diamond plates. Both V-groove and rectangular gratin ...

2019

A novel microfabrication platform for hybrid multilayer MEMS

Nahid Hosseini

In Atomic force microscopy (AFM), the tip-sample interaction force can be measured through two primary detection techniques: optical beam detection (OBD) and electrical (self-sensing) readout. Compared to the optical method, the convenience of the self-sen ...

EPFL2019

Integration of sharp silicon nitride tips into high-speed SU8 cantilevers in a batch fabrication process

Oliver Peric, Santiago Harald Andany, Georg Fantner, Jonathan David Adams, Matthias Neuenschwander, Nahid Hosseini

Employing polymer cantilevers has shown to outperform using their silicon or silicon nitride analogues concerning the imaging speed of atomic force microscopy (AFM) in tapping mode (intermittent contact mode with amplitude modulation) by up to one order of ...

Beilstein Institut2019

Recent improvements on micro-thermocouple based SThM

Danick Briand

The scanning thermal microscope (SThM) has become a versatile tool for local surface temperature mapping or measuring thermal properties of solid materials. In this article, we present recent improvements in a SThM system, based on a micro-wire thermocoupl ...

Iop Publishing Ltd2017

Position and mode dependent optical detection back-action in cantilever beam resonators

Luis Guillermo Villanueva Torrijo, Tom Larsen

Optical detection back-action in cantilever resonant or static detection presents a challenge when striving for state-of-the-art performance. The origin and possible routes for minimizing optical back-action have received little attention in literature. He ...

Institute of Physics2017

Characterization at the Atomistic Level of Defective Structures in Complex Materials : A Theoretical Study

Piyush Agrawal

Defects are key to enhance or deploy particular materials properties. In this thesis I present analyses of the impact of defects on the electronic structure of materials using combined experimental and theoretical Electron energy loss spectroscopy (EELS) i ...

EPFL2017

Harnessing the damping properties of materials for high-speed atomic force microscopy

Jürgen Brugger, Jonas Grossenbacher, Georg Fantner, Blake William Erickson, Jonathan David Adams, Adrian Pascal Nievergelt

The success of high-speed atomic force microscopy in imaging molecular motors1, enzymes2 and microbes3 in liquid environments suggests that the technique could be of significant value in a variety of areas of nanotechnology. However, the majority of atomic ...

Nature Publishing Group2016

Determination of the Elastic Behavior of Silicon Nanowires within a Scanning Electron Microscope

Yusuf Leblebici, Zuhal Tasdemir

Three-point bending tests were performed on double-anchored, < 110 > silicon nanowire samples in the vacuum chamber of a scanning electron microscope ( SEM) via a micromanipulator equipped with a piezoresistive force sensor. Nanowires with widths of 35nm a ...

Hindawi Limited2016

A single probe for imaging photons, electrons and physical forces

Yuliya Lisunova

The combination of complementary measurement techniques has become a frequent approach to improve scientific knowledge. Pairing of the high lateral resolution scanning force microscopy (SFM) with the spectroscopic information accessible through scanning tr ...

Iop Publishing Ltd2016

Piezoresistive AFM cantilevers surpassing standard optical beam deflection in low noise topography imaging

Georg Fantner, Jonathan David Adams, Maja Dukic Pjanic

Optical beam deflection (OBD) is the most prevalent method for measuring cantilever deflections in atomic force microscopy (AFM), mainly due to its excellent noise performance. In contrast, piezoresistive strain-sensing techniques provide benefits over OBD ...

Nature Publishing Group2015

Local electronic properties and adsorption conformations of molecular nanostructures at surfaces

Ivan Pentegov

Nanoscale science is an emerging field of our time and opens a broad horizon for applications in almost every area of human activity, from medicine to energy storage. As usual, there are numerous challenges in the way of progress, which slow down the devel ...

EPFL2015

An iterative analytical/experimental study of bridging in delamination of the double cantilever beam specimen

John Botsis, Behzad Dehghan Manshadi, Anastasios Vassilopoulos, Ebrahim Farmand Ashtiani

Large scale bridging in mode-I delamination of layered composites is an important toughening mechanism. While its extent depends on constituent materials, it is also influenced by specimen geometry. Here, an analytical approach is adopted to express the th ...

Elsevier2014

Method for scanning sample involves providing compensatory signal to actuator after generating compensatory signal on first component of data signal generated by sensor

Georg Fantner

NOVELTY - The scanning method involves generating data signal using a sensor. The first component based on a motion in a first direction of an actuator configured to provide motion between a sample and a probe in the first direction, the first direction su ...

2011

A nano-tensile testing system for studying nanostructures inside an electron microscope : design, characterization and application

Dongfeng Zhang

Mechanical properties of nanostructures could be remarkably different from their bulk counterparts owing to scale effects, which have attracted considerable research interest in recent years. However, nanomechanics studies are hindered by the difficulties ...

EPFL2010

Nanostructured Functional Particles and Surfaces

Arthur Olivier Joseph Ganz

Topographic nanostructuring of surfaces is a promising concept, in particular to improve the bio-integration of titanium orthopedic implants. In this context, a new method for the nanostructuring of anodised titanium surfaces was developed. Ordered topogra ...

EPFL2010