Publications de Ulrike Lehmann

Highly sensitive SnO2 sensor via reactive laser-induced transfer

Ulrike Lehmann, Alain Grisel, Alexander Wokaun

Gas sensors based on tin oxide (SnO2) and palladium doped SnO2 (Pd:SnO2) active materials are fabricated by a laser printing method, i.e. reactive laser-induced forward transfer (rLIFT). Thin films from tin based metal-complex precursors are prepared by sp ...

Nature Research2016

Fluorescent magnetic bead and cell differentiation/counting using a CMOS SPAD matrix

Edoardo Charbon, Martinus Gijs, Ulrike Lehmann, Caroline Vandevyver, Emile Dupont

We present a monolithic silicon chip comprising a matrix of 84 single photon avalanche diodes (SPADs) to detect and discriminate fluorescent beads or fluorescently labeled single cells in a polydimethyl(-siloxane) (PDMS) cartridge that is positioned on top ...

Elsevier2012

Microfluidic applications of magnetic particles for biological analysis and catalysis

Martinus Gijs, Ulrike Lehmann, Frédéric Lacharme

American Chemical Society2010

Monolithic Silicon Chip for Immunofluorescence Detection on Single Magnetic Beads

Edoardo Charbon, Martinus Gijs, Ulrike Lehmann, Caroline Vandevyver, Emile Dupont

While fluorescence detection is widely used for bioassays owing to its high sensitivity, a complete fluorescent microscopy setup, comprised of a light source, optical filters, a microscope body, and a camera, still is bulky equipment, compromising its use ...

2010

Manipulation of magnetic microparticles in liquid phases for on-chip biomedical analysis methods

Ulrike Lehmann

Magnetic microparticles and their application in bioanalytical microfluidic systems have been steadily gaining interest in recent years. This progress is fueled by the comparatively large and long range magnetic forces that can be obtained independently of ...

EPFL2008

Microparticle photometry in a CMOS microsystem combining magnetic actuation and in-situ optical detection

Edoardo Charbon, Martinus Gijs, Ulrike Lehmann, Cristiano Niclass, Emile Dupont, Stefano Pietrocola

We present a hybrid CMOS-based microfluidic system that combines magnetic actuation of microparticles with in situ optical detection using single photon avalanche diodes (SPADs). The decoupling of the principles used for actuation and sensing permits a hig ...

2008

On-Chip Sandwich Immunoassay in an Integrated Magneto-Optical CMOS Microsystem

Edoardo Charbon, Martinus Gijs, Ulrike Lehmann, Emile Dupont

We report on an innovative approach to on-chip detection of single fluorescently-labeled magnetic micro-particles by means of Single Photon Avalanche Diode (SPAD) arrays. Our system enables particle separation through magnetic actuation and highly sensitiv ...

2008

On-chip detection of sandwich immunoassay in an integrated magneto-optical CMOS microsystem

Edoardo Charbon, Martinus Gijs, Ulrike Lehmann, Emile Dupont

2008

Particle-Shadow Tracking – Combining Magnetic Particle Manipulation with In-Situ Optical Detection in a CMOS Microsystem

Edoardo Charbon, Martinus Gijs, Ulrike Lehmann, Cristiano Niclass, Stefano Pietrocola

We present a hybrid CMOS based microsystem where magnetic actuation of microparticles is combined with integrated optical detection via Single Photon Avalanche Diodes (SPADs). The system’s configuration permits the manipulation and detection of single magn ...

2007

Detection of fluorescently labelled magnetic particles for lab-on-a-chip applications

Edoardo Charbon, Martinus Gijs, Ulrike Lehmann, Emile Dupont

2007