Publications associées à Tip-enhanced Raman Spectroscopy - Its status, challenges and future directions

Controlling crystal cleavage in focused ion beam shaped specimens for surface spectroscopy

Philip Johannes Walter Moll, Matthias Carsten Putzke, Andrew Scott Hunter

Our understanding of quantum materials is commonly based on precise determinations of their electronic spectrum by spectroscopic means, most notably angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy. Both require atomicall ...

Aip Publishing2024

Resonant Tip-Enhanced Raman Spectroscopy of a Single-Molecule Kondo System

Jiri Dolezal

Tip-enhanced Raman spectroscopy (TERS) under ultrahigh vacuum and cryogenic conditions enables exploration of the relations between the adsorption geometry, electronic state, and vibrational fingerprints of individual molecules. TERS capability of reflecti ...

Amer Chemical Soc2024

Optical manipulation of plasmonic nanoparticles: Applications in surface chemistry and nano-optics

Jeonghyeon Kim

Optical tweezers are devices that can manipulate nano- and microparticles using a laser. The principle of optical tweezers is to apply a force to an object using the momentum of light. This force is very small, but it is sufficient to move things in the mi ...

EPFL2023

Plasmon-induced near-infrared fluorescence enhancement of single-walled carbon nanotubes

Giulia Tagliabue, Amirmostafa Amirjani, Ardemis Anoush Boghossian, Sayyed Hashem Sajjadi, Shang-Jung Wu, Alessandra Antonucci, Theodoros Tsoulos

Single-walled carbon nanotubes (SWCNTs) emit near-infrared (NIR) fluorescence that is ideal for optical sensing. However, the low quantum yields diminish the sensor’s signal-to-noise ratio and limits the penetration depths for in vivo measurements. In this ...

2022

In situ nanoscale studies of copper-based catalysts for carbon dioxide electroreduction

Karla Banjac

The urgency of climate change demands the simultaneous removal of carbon dioxide from the atmosphere and the transition to renewable energy sources. This aim is realizable through electrochemical reduction of carbon dioxide (CO2RR), which is a promising ro ...

EPFL2021

Scanning Probe-Directed Assembly and Rapid Chemical Writing Using Nanoscopic Flow of Phospholipids

Vytautas Navikas

Nanofluidic systems offer a huge potential for discovery of new molecular transport and chemical phenomena that can be employed for future technologies. Herein, we report on the transport behavior of surface-reactive compounds in a nanometer-scale flow of ...

AMER CHEMICAL SOC2019

AFM contribution to unveil pro- and eukaryotic cell mechanical properties

Giovanni Dietler, Sandor Kasas, Petar Stupar

Atomic force microscopy is nowadays a well-established technique that permits the investigation of numerous parameters of living matter. In particular, it allows the exploration of the mechanical properties of living organisms in almost physiological condi ...

Elsevier2018

Insight into the catalyst/photocatalyst microstructure presenting the same composition but leading to a variance in bacterial reduction under indoor visible light

Juan Kiwi, César Pulgarin, Sami Rtimi

Insight into two different uniform atomic-scale microstructures of Cu-and Ti-oxides sputtered on polyethylene (PET) presenting different redox properties and a distinct bacterial inactivation dynamics. Co-sputtered (CuOx-TiO2-PET) consists mainly of CuO. I ...

Elsevier2017

Nanostructured Surfaces for the Detection of Single-Particles and Single-Molecules

Romain Wyss

Biomarker detection and diagnosis are important steps in the prevention and the treatment of a disease. There is an increasing need for utmost sensitive and robust sensing devices; in this framework, subwavelength (metal) pores could contribute to a concep ...

EPFL2013

Gap Plasmons and Near-Field Enhancement in Closely Packed Sub-10 nm Gap Resonators

Olivier Martin, Thomas Gerd Siegfried

Pairs of metal nanoparticles with a sub-10 nm gap are an efficient way to achieve extreme near-field enhancement for sensing applications. We demonstrate an attractive alternative based on Fabry-Perot type nanogap resonators, where the resonance is defined ...

Amer Chemical Soc2013

Peak Shift Measurement of Localized Surface Plasmon Resonance by a Portable Electronic System

Luca Benini, Enrico Accastelli, Carlotta Guiducci, Giulia Cappi

In recent years, the characterization of surface molecular layers by localized surface plasmon resonance (LSPR) has attracted a lot of interest thanks to its ability to provide a higher spatial resolution with respect to standard SPR. LSPR can be observed ...

Elsevier2013

Selective Alkyne Hydrogenation over Nano-metal Systems: Closing the Gap between Model and Real Catalysts for Industrial Applications

Lioubov Kiwi, Rocio Micaela Crespo Quesada, Fernando Cardenas Lizana

The relationship between catalytic response and properties of the active phase is difficult to establish in classical heterogeneous catalysis due to the number of variables that can affect catalytic performance. Ultrahigh-vacuum surface methods applied to ...

Swiss Chemical Soc2012

Oxidative Stress on Human Cells in the Presence of Nano-Sized Titanium Dioxide

Katarzyna Pierzchala

Nanosized TiO2 (nanoTiO2) is one of the most widely used nanomaterials, with applications ranging from paints, self-cleaning coatings, pharmaceuticals, to food and cosmetics. In spite of this massive use of nanoTiO2, its biological activity and toxicity re ...

EPFL2010

VUV-induced radiation ageing processes in CsI photocathodes studied by microscopy and spectroscopy techniques

Pranav Garg

CsI thin film photocathodes of 600 nm thickness deposited on polished Al surfaces by resistive evaporation technique were studied by angle-resolved X-ray photoelectron spectroscopy (ARXPS), before and after UV-irradiation under vacuum. It is shown that the ...

2009

Carbon nanotubes functionalized with dye molecules and metal nanoparticles

Tilman Assmus

Single-walled carbon nanotubes are highly interesting quasi one-dimensional nanostructures. They possess a multitude of fascinating optical, mechanical and electrical properties, which can be even further expanded through appropriate functionalization stra ...

EPFL2008

Enhancement and subwavelength confinement of light in plasmonic nanostructures

Holger Fischer

This work includes the fabrication of plasmonic nanostructures as well as the investigation of their optical properties in the near-field and in the farfield. As expressed in the title of this thesis the focus lies in the subwavelength confinement and enha ...

EPFL2008

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

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

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