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Andreas Stephan Lesch

Cette personne a quitté l’EPFL

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Publications associées (57)

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Microfluidic Push-Pull Probe for Scanning Electrochemical Microscopy

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

This paper presents a microfluidic push-pull probe for scanning electrochemical microscopy (SECM) consisting of a working microelectrode, an integrated counter/reference electrode and two microchannels for pushing and pulling an electrolyte solution to and ...

2011

Print-Light-Synthesis of Ni and NiFe-nanoscale catalysts for oxygen evolution

Hubert Girault, Emad Oveisi, Andreas Stephan Lesch, Mounir Driss Mensi, Victor Costa Bassetto

By hyphenating inkjet printing and flash light irradiation, Ni- and NiFe-nano-electrocatalysts of diameters below 2.5 nm with ultralow loadings below 2 µg·cm–2 are synthesized. To achieve this, nanoliter ink volumes containing Ni and Fe chlorides as cataly ...

2019

Fountain pen for scanning electrochemical microscopy

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

A fountain pen probe has been developed to extend the scope of scanning electrochemical microscopy (SECM) experiments to dry surfaces. The fountain pen is fabricated by UV-photoablation of a polyethylene terephthalate (PET) film and consists on one side of ...

Royal Society of Chemistry2010

Highly Loaded Mildly Edge‐Oxidized Graphene Nanosheet Dispersions for Large‐Scale Inkjet Printing of Electrochemical Sensors

Hubert Girault, Andreas Stephan Lesch, Horst Pick, Milica Jovic, Victor Costa Bassetto, Yingdi Zhu, Bhawna Nagar

Inkjet printing of electrochemical sensors using a highly loaded mildly edge‐oxidized graphene nanosheet (EOGN) ink is presented. An ink with 30 mg/mL EOGNs is formulated in a mixture of N‐methyl pyrrolidone and propylene glycol with only 30 min of sonicat ...

2020

The antioxidant capacity of erythrocyte concentrates is increased during the first week of storage and correlated with the uric acid level

Hubert Girault, Fernando Cortes Salazar, Andreas Stephan Lesch, Niels Erik Lion, Michel Prudent, Sunny Isaïe Maye, Manon Sandra Bardyn

Background and Objectives: Red blood cells (RBCs) suffer from lesions during cold storage, depending in part on their ability to counterbalance oxidative stress by activating their antioxidant defence. The aim of this study was to monitor the antioxidant p ...

Wiley-Blackwell2017

Electrochemical Imaging of Cells and Tissues

Hubert Girault, Andreas Stephan Lesch, Tzu-En Lin

The technological and experimental progress in electrochemical imaging of biological specimens is discussed with a view on potential applications for skin cancer diagnostics, reproductive medicine and microbial testing. The electrochemical analysis of sing ...

2018

Point-of-care amperometric determination of L-dopa using an inkjet-printed carbon nanotube electrode modified with dandelion-like MnO2 microspheres

Hubert Girault, Andreas Stephan Lesch, Milica Jovic

An electrochemical sensor is described for the determination of L-dopa (levodopa; 3,4-dihydroxyphenylalanine). An inkjet-printed carbon nanotube (IJPCNT) electrode was modified with manganese dioxide microspheres by drop-casting. They coating was character ...

2019

Local Study on Hydrogen and Hydrogen Gas Bubble Formation on a Platinum Electrode

Hubert Girault, Andreas Stephan Lesch, Christopher Raymond Dennison, Alberto Battistel

This work investigates the effect of current density on the hydrogen gas bubble formation during electrolysis on a platinum electrode. Local detection of bubble evolution was performed electrochemically by using a hydrogen-collecting microelectrode placed ...

AMER CHEMICAL SOC2019

Skin cell analysis

Hubert Girault, Andreas Stephan Lesch, Horst Pick, Milica Jovic, Tzu-En Lin, Yingdi Zhu

The present invention describes an adhesive tape stripping transfer method for quick and non-invasive diagnosis of skin diseases by MALDI-TOF mass spectrometry analysis. Cells from the epidermis layer of a suspicious skin area of a patient are collected us ...

2020

Surface-confined Electrochemiluminescence Microscopy of Cell Membranes

Andreas Stephan Lesch, Milica Jovic

Herein is reported a surface-confined microscopy based on electrochemiluminescence (ECL) which allows to image the plasma membrane of single cells at the interface with an electrode. By analyzing photoluminescence (PL), ECL and AFM images of mammalian CHO ...

2018

Electrostatic Spray Ionization Mass Spectrometry Imaging

Hubert Girault, Horst Arthur Vogel, Andreas Stephan Lesch, Liang Qiao, Horst Pick, Alexandra Bondarenko, Elena Tobolkina, Xiaoqin Zhong

Imaging samples on a surface by mass spectrometry (MS) requires the combination of MS detection with a scanning mode that enables localized desorption and ionization and/or detection of sample analytes with good spatial resolution. We have developed a new ...

Amer Chemical Soc2014

Finger Probe Array for Topography-Tolerant Scanning Electrochemical Microscopy of Extended Samples

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

Scanning electrochemical microscopy with soft microelectrode array probes has recently been used to enable reactivity imaging of extended areas and to compensate sample corrugation perpendicular to the scanning direction. Here, the use of a new type of mic ...

Amer Chemical Soc2014

Fashioning Fluorous Organic Spacers for Tunable and Stable Layered Hybrid Perovskites

Mohammad Khaja Nazeeruddin, Andreas Stephan Lesch, Iwan Zimmermann, Giulia Grancini, Valentin Ianis Emmanuel Queloz, Inés Garcia Benito

2018

Inkjet Printed Carbon Nanotube Electrodes for Measuring Pyocyaninand Uric Acid in a Wound Fluid Simulant and Culture Media

Hubert Girault, Andreas Stephan Lesch, Milica Jovic

Polyacrylamide-coated, carbon nanotube (PA/CNT)electrodes were prepared by an ink-jet printing process and used to measure pyocyanin and uric acid in a wound fluid simulant at 37 oC.These two moleculesare potential indicators of infection and therefore the ...

2019

Monitoring Tyrosinase Expression in Non-metastatic and Metastatic Melanoma Tissues by Scanning Electrochemical Microscopy

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

Although tremendous progress has been made in the diagnosis of melanoma, the identification of different stages of malignancy in a reliable way remains challenging. Current strategies rely on optical monitoring of the concentration and spatial distribution ...

Wiley-Blackwell2016

Disposable Biosensor Based on Amidase/CeO2/GNR Modified Inkjet‐printed CNT Electrodes‐droplet Based Paracetamol Detection in Biological Fluids for “Point‐of‐care” Applications

Hubert Girault, Andreas Stephan Lesch, Milica Jovic

2019

Inkjet-Printed Mesoporous TiO2 and Perovskite Layers for High Efficiency Perovskite Solar Cells

Mohammad Khaja Nazeeruddin, Paul Joseph Dyson, Hubert Girault, Emad Oveisi, Andreas Stephan Lesch, Sanghyun Paek, Yonghui Lee, Aron Joel Huckaba, Victor Costa Bassetto

Perovskite solar cells with mesoporous TiO2 electron transport layers have previously reached >22 % efficiency at the laboratory scale (

2019

Printing of NiO-YSZ nanocomposites: from continuous synthesis to inkjet deposition

Andreas Stephan Lesch, Victor Costa Bassetto

Water-based inks, containing nanometric NiO and YSZ particles in 66/34 vol. % ratio, are produced by colloidal stabilization of a binary dispersion obtained via continuous hydrothermal synthesis at supercritical conditions, i.e. 280 bar and 400 °C. The met ...

2019

Rapid optimisation of a lactate biosensor design using soft probes scanning electrochemical microscopy

Hubert Girault, Andreas Stephan Lesch, Fernando Cortes Salazar

We report the mapping of biocatalytically active surfaces, particularly on an express search for optimal immobilization conditions of the enzyme lactate oxidase by means of scanning electrochemical microscopy (SECM). With this aim, soft stylus SECM probes ...

Elsevier2014

Water-Repellent Low-Dimensional Fluorous Perovskite as Interfacial Coating for 20% Efficient Solar Cells

Mohammad Khaja Nazeeruddin, Yi Zhang, Andreas Stephan Lesch, Iwan Zimmermann, Giulia Grancini, Kyung Taek Cho

Hybrid perovskite solar cells have been capturing an enormous research interest in the energy sector due to their extraordinary performances and ease of fabrication. However, low device lifetime, mainly due to material and device degradation upon water exp ...

American Chemical Society (ACS)2018