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Andreas Stephan Lesch

Cette personne a quitté l’EPFL

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Publications associées (57)

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Soft-probe-scanning electrochemical microscopy reveals electrochemical surface reactivity of E. coli biofilms

Hubert Girault, Emad Oveisi, Andreas Stephan Lesch, Horst Pick, Sorour Darvishi

Investigating and understanding dynamic biofilm growth mechanisms is challenging, often because state-of-the-art optical characterization tools provide limited information. Micrometric electrochemical imaging of Escherichia coli biofilms using Soft-Probe-S ...

Elsevier2021

Impact of cation redox chemistry on continuous hydrothermal synthesis of 2D-Ni(Co/Fe) hydroxides

Andreas Stephan Lesch

Continuous hydrothermal flow synthesis (CHFS) is a facile, upscalable and cost-efficient synthetic method enabling the nanostructuring of advanced functional materials in steady conditions, i.e. not in batch synthesis. In this paper, we use CHFS to crystal ...

ROYAL SOC CHEMISTRY2019

Montmorillonite clay-modified disposable ink-jet-printed graphene electrode as a sensitive voltammetric sensor for the determination of cadmium(II) and lead(II)

Hubert Girault, Andreas Stephan Lesch, Milica Jovic, Victor Costa Bassetto

This work describes a new sensitive sensor for the simultaneous electrochemical determination by square wave anodic stripping voltammetry of Cd2+ and Pb2+ ions in aqueous solution, based on a disposable ink-jet-printed graphene electrode (IPGE) modifed by ...

2020

Large scale inkjet-printing of carbon nanotubes electrodes for antioxidant assays in blood bags

Hubert Girault, Andreas Stephan Lesch, Fernando Cortes Salazar, Niels Erik Lion, Michel Prudent

Herein, we present the large scale fabrication of carbon nanotubes (CNT) electrodes supported on flexible polymeric sheets by subsequent multilayer inkjet printing of a silver layer for electrical connection, CNT layers as active electrode material and an ...

Elsevier2014

Multiple scanning electrochemical microscopy mapping of tyrosinase in micro-contact printed fruit samples on polyvinylidene fluoride membrane

Hubert Girault, Andreas Stephan Lesch, Liang Qiao, Fernando Cortes Salazar, Alexandra Bondarenko, Tzu-En Lin

Herein, we introduce three orthogonal and compatible methods for detecting tyrosinase, a key factor in fruit browning and skin disorders, with high spatial resolution by means of scanning electrochemical microscopy (SECM). All methods are performed subsequ ...

Elsevier2015

Seeing Big with Scanning Electrochemical Microscopy

Hubert Girault, Andreas Stephan Lesch, Fernando Cortes Salazar, Gunther Wittstock, Dmitry Momotenko

Specialized microelectrode probes fabricated in a soft polymer film now make it possible to use scanning electrochemical microscopy to image the reactivity of large, corrugated, tilted, and dry surfaces. ...

American Chemical Society2011

Oxygen Plasma/Bismuth Modified Inkjet Printed Graphene Electrode for the Sensitive Simultaneous Detection of Lead and Cadmium

Hubert Girault, Andreas Stephan Lesch, Milica Jovic, Victor Costa Bassetto

In this work, a simple procedure for the preparation of an inkjet printed disposable graphene electrode is reported. Commercial graphene ink was printed on a kapton substrate and the resulting electrode was 30 min treated by oxygen plasma, then modified by ...

2020

Mapping the antioxidant activity of apple peels with soft probe scanning electrochemical microscopy

Hubert Girault, Andreas Stephan Lesch, Tzu-En Lin

We present a non-invasive electrochemical strategy for mapping the antioxidant (AO) activity of apple peels, which counterbalances oxidative stress caused by various external effectors. Soft carbon microelectrodes were used for soft probe scanning electroc ...

Elsevier Science Sa2017

Print-Light-Synthesis of ruthenium oxide thin film electrodes for electrochemical sensing applications

Andreas Stephan Lesch, Horst Pick

Print-Light-Synthesis (PLS) combines the inkjet printing of a ruthenium precursor ink with the simultaneous photo-induced generation of ruthenium oxide films. During PLS, inkjet-printing generates on conductive as well as insulating substrates micrometer-t ...

Elsevier BV2025

Electrochemical Push–Pull Scanner with Mass Spectrometry Detection

Hubert Girault, Andreas Stephan Lesch, Liang Qiao, Fernando Cortes Salazar, Gunther Wittstock, Dmitry Momotenko

This manuscript presents a push-pull electrochem. scanner able to image reactivity of initially dry surfaces by scanning electrochem. microscopy (SECM) and to probe mols. present or generated at the surface by mass spectrometry (MS). The proof-of-concept i ...

Amer Chemical Soc2012

Microfluidic Probes for Scanning Electrochemical Microscopy

Hubert Girault, Andreas Stephan Lesch, Fernando Cortes Salazar, Alexandra Bondarenko, Tzu-En Lin

This chapter discusses the soft microfluidic scanning electrochemical microscopy (SECM) probes represent a versatile tool for supporting various investigations ranging from the electrochemical characterization of different surfaces to the local perturbatio ...

Wiley2018

Inkjet-Printed Carbon Nanotube Electrodes Modified with Dimer-captosuccinic Acid-Capped Fe3O4 Nanoparticles on Reduced Graphene Oxide Nanosheets for Single-Drop Determination of Trifluoperazine

Hubert Girault, Andreas Stephan Lesch, Milica Jovic

Here we report the design of a disposable single-drop voltammetric sensor for the quantitative determination of antipsy-chotic drug trifluoperazine (TFP). The sensor was build using inkjet-printed carbon nanotube (CNT) electrodes which were modified with d ...

2020

Inkjet Printing Meets Electrochemical Energy Conversion

Hubert Girault, Fernando Cortes Salazar, Andreas Stephan Lesch, Véronique Amstutz, Victor Costa Bassetto

Inkjet printing is a very powerful digital and mask-less microfabrication technique that has attracted the attention of several research groups working on electrochemical energy conversion concepts. In this short review, an overview is given about recent e ...

2015

Fixation and Permeabilization Approaches for Scanning Electrochemical Microscopy of Living Cells

Hubert Girault, Andreas Stephan Lesch, Horst Pick, Fernando Cortes Salazar, Alexandra Bondarenko, Tzu-En Lin, Petar Stupar

Scanning electrochemical microscopy (SECM) has been widely used for the electrochemical imaging of dynamic topographical and metabolic changes in alive adherent mammalian cells. However, extracting intracellular information by SECM is challenging, since it ...

American Chemical Society2016

Untersuchung der Tyrosinase-Expression in nicht-metastatischen und metastatischen Melanomgeweben durch elektrochemische Rastersondenmikroskopie

Hubert Girault, Horst Pick, Fernando Cortes Salazar, Andreas Stephan Lesch, Alexandra Bondarenko, Tzu-En Lin

Trotz des enormen Fortschritts, der bei der Diagnose von Melanomen erzielt wurde, bleibt die zuverlässige Erkennung der verschiedenen Malignomstadien eine Herausforderung. Derzeitige Strategien setzen auf die optische Erfassung der Konzentration und räumli ...

Wiley-Blackwell2016

Large-scale layer-by-layer inkjet printing of flexible iridium-oxide based pH sensors

Hubert Girault, Jonnathan Cesar Hidalgo Acosta, Fernando Cortes Salazar, Andreas Stephan Lesch, Milica Jovic, Evgeny Smirnov, Victor Costa Bassetto

2018

Weiche elektrochemische Sonden zum Abbilden der Verteilung von Biomarkern und injizierten Nanomaterialien in tierischem und menschlichem Gewebe

Hubert Girault, Andreas Stephan Lesch, Horst Pick, Tzu-En Lin, Yu Lu

Die Untersuchung von Biomarkern und injizierten theranostischen Nanomaterialien in Geweben und Organen spielt eine zentrale Rolle bei zahlreichen medizinischen Verfahren von der Krebsdiagnose bis hin zur Arzneimittelverabreichung. Zu diesem Zweck kann die ...

Wiley-Blackwell2017