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Nico de Rooij

Cette personne a quitté l’EPFL

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Publications associées (85)

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Droplet-based Liquid-Liquid Extraction and On-Chip IR-Waveguide-Spectroscopy Detection of Cocaine in Human Saliva

Nico de Rooij, Hans Peter Herzig, Peter Van der Wal, Lubos Hvozdara, Yu-Chi Chang, Philip Wägli

We present a portable microsystem to quantitatively detect cocaine in human saliva. The chip combines a simple microfluidic method for multiphase liquid-liquid extraction to transfer cocaine from IR-light absorbing saliva to an IRtransparent solvent with t ...

2012

Development of a New Generation of Ammonia Sensors on Printed Polymeric Hotplates

Nico de Rooij, Danick Briand, Francisco Molina Lopez, Andres Felipe Vasquez Quintero, El Hadji Malick Camara

Conducting polyaniline-based chemiresistors on printed polymeric micro-hotplates were developed, showing sensitive and selective detection of ammonia vapor in air. The devices consist of a fully inkjet-printed silver heater and interdigitated electrodes on ...

American Chemical Society2014

Memory effects of ion-selective electrodes: Theory and computer simulation of the time-dependent potential response to multiple sample changes

Nico de Rooij

A straightforward theoretical description of the time-dependent response of ion-selective membrane electrodes to multiple sample changes is presented. The derivation makes use of an approximation for the ion fluxes in the membrane, and of the superposition ...

Elsevier2009

Far-infrared sensor with LPCVD-deposited low-stress Si-rich nitride absorber membrane—Part 1. Optical absorptivity

Nico de Rooij, Fabio Jutzi

This is the first part of the two articles reporting investigation of a thermal detector-type far-infrared sensor operating in the 8–14µm wavelength, using Low-Pressure-Chemical-Vapor-Deposition (LPCVD)- deposited low-stress Si-rich nitride (SiN)membrane a ...

2009

Thermal Characterization of Polycrystalline CVD Diamond Thin Films

Nico de Rooij, Danick Briand, Wilfried Noell, Caglar Ataman, Sébastien Lani

An experimental thermal characterization method is developed for high thermal conductivity thin films. The method utilizes Ta/Pt resistors on microfabricated free-standing thin film structures both for heating and temperature monitoring at different positi ...

Elsevier Science, Reg Sales Off, Customer Support Dept, 655 Ave Of The Americas, New York, Ny 10010 Usa2009

Flexible and Robust Multilayer Micro-Vibrational Harvesters for High Acceleration Environments

Nico de Rooij, Danick Briand, Andres Felipe Vasquez Quintero, Pattanaphong Janphuang, Robert Andrew Lockhart

This paper presents the fabrication and characterization of multilayer PVDF resonant micro-vibrational energy harvesters designed to withstand environments in which high levels of acceleration are present. The multilayer cantilevers are fabricated by combi ...

Iop Publishing Ltd2013

Large linear micromirror array for UV femtosecond laser pulse shaping

Nico de Rooij

We are fabricating a bulk-micromachined micromirror device for laser pulse shaping applications on femtosecond time scales. An array of micromirrors is used to individually retard or diminish certain laser frequencies spanning from the UV to the near-infra ...

2008

Fully inkjet printed SnO2 gas sensor on plastic substrate

Nico de Rooij, Danick Briand, El Hadji Malick Camara

A tin dioxide (SnO2) sensor was fabricated by inkjet printing onto polyimide foil. Gold electrodes and heater were printed on each side of the substrate. A SnO2 based ink was developed by sol-gel method and jetted onto the electrodes. A final annealing at ...

Elsevier2016

Complex nanostructures in PMMA made by a single process step using e-beam lithography

Nico de Rooij, Sebastian Gautsch, Michel Studer

We present results on the single step fabrication of autocentered nanopillars with surrounding circular rim. This particular 3-dimensional shape is created by the energy density distribution of incident and backscattered electrons and reflects the dual beh ...

2009

Study of laser-pumped double-resonance clock signals using a microfabricated cell

Nico de Rooij, Yves Pétremand

We present our microwave spectroscopic studies on laser-microwave double-resonance (DR) signals obtained from a micro-fabricated Rb vapor cell. This study focuses on the characteristics and systematic shifts of the ground-state 'clock transition' in Rb-87 ...

2012

A Wearable System Of Micromachined Piezoelectric Cantilevers Coupled To A Rotational Oscillating Mass For On-Body Energy Harvesting

Nico de Rooij, Danick Briand, Pattanaphong Janphuang, Robert Andrew Lockhart

In this paper, we present a compact, wearable piezoelectric on-body harvesting system that uses a small eccentric mass from a common watch movement to mechanically deflect a set of micromachined piezoelectric cantilevers when excited by the low frequency m ...

IEEE2014

Spectral phase, amplitude, and spatial modulation from ultraviolet to infrared with a reflective MEMS pulse shaper

Nico de Rooij, Wilfried Noell, Luigi Bonacina, Jérôme Extermann, Sébastien Lani, Fabio Jutzi

We describe the performance of a reflective pulse-shaper based on a Micro-ElectroMechanical System (MEMS) linear mirror array. It represents a substantial upgrade of a preceding release [Opt. Lett. 35, 3102 (2010)] as it allows simultaneous piston and tilt ...

Optical Society of America2011

Multiphysics finite element model of a frequency-amplifying piezoelectric energy harvester with impact coupling for low-frequency vibrations

Nico de Rooij, Danick Briand, Andres Felipe Vasquez Quintero, Pattanaphong Janphuang, Robert Andrew Lockhart

This paper presents experimentally-verified multiphysics finite element model of a wideband vibration energy harvester with impact coupling, which operates on the principle of frequency up-conversion: under low-frequency harmonic base excitation a cantilev ...

Iop Publishing Ltd2013

Large Arrays Of Inkjet-Printed Mems Microbridges On Foil

Nico de Rooij, Danick Briand, Francisco Molina Lopez

This works describes the fabrication process of an array of printed MEMS microbridges on polymeric foil, performed in only four easy steps. Each functional material was deposited exclusively by inkjet-printing technique, compatible with large-area fabricat ...

IEEE2014

Microactuators based on ion-implanted dielectric Electroactive Polymer Membranes (EAP)

Nico de Rooij, Herbert Shea, Samuel Rosset

We report on the first ion-implanted dielectric electroactive polymer actuator that was successfully microfabricated and tested. Ion implantation is used to make the surface of the polymer locally conducting. Implanting the compliant electrodes solves the ...

2005

A miniature frequency-stabilized VCSEL system emitting at 795nm based on LTCC modules

Nico de Rooij, Thomas Maeder, Yves Pétremand, Fabrizio Vecchio

We present a compact frequency-stabilized laser system locked to the Rubidium absorption line of a micro-fabricated reference cell. A printed circuit board (PCB) is used to carry all the components and part of the electronics, and low-temperature co-fired ...

Elsevier2013

A portable lab-on-a-chip instrument based on MCE with dual topbottom capacitive coupled contactless conductivity detector in replaceable cell cartridge

Nico de Rooij

A new design for a compact portable lab-on-a-chip instrument based on MCE and dual capacitively coupled contactless conductivity detection (dC4D) is described. The instrument is battery powered with total dimension of 14 x 25 x 8 cm3 (w x l x h), and weigh ...

Wiley-Blackwell2013

Microfabricated rubidium vapour cell with a thick glass core for small-scale atomic clock applications

Nico de Rooij, Danick Briand, Yves Pétremand

This paper presents a new fabrication method to manufacture alkali reference cells having dimensions larger than standard micromachined cells and smaller than glass-blown ones, for use in compact atomic devices such as vapour-cell atomic clocks or magnetom ...

Institute of Physics2012

Inkjet printed colorimetric ammonia sensor on plastic foil for low-cost and low-power devices

Nico de Rooij, Danick Briand, Jérôme Courbat

A polymeric-based colorimetric gas sensor with its associated electronics targeting ammonia detectionat low-cost and low-power is presented. The gas sensitive layer was inkjet printed on a plastic foil used as an optical waveguide. The planarconfiguration ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

On the experimental determination of the efficiency of piezoelectric impact-type energy harvesters using a rotational flywheel

Nico de Rooij, Danick Briand, Simon Nessim Henein, Pattanaphong Janphuang, Robert Andrew Lockhart

This paper demonstrates a novel methodology using a rotational flywheel to determine the energy conversion efficiency of the impact based piezoelectric energy harvesters. The influence of the impact speed and additional proof mass on the efficiency is pres ...

Iop Publishing Ltd2013