Gregory Fonder
Université de Namur
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Publication
Featured researches published by Gregory Fonder.
Journal of Colloid and Interface Science | 2008
Gregory Fonder; Fabrice Laffineur; Joseph Delhalle; Zineb Mekhalif
In this contribution, self-assembled monolayers of n-dodecanethiol (C(12)H(25)SH) at different concentrations on polycrystalline copper have been elaborated. Using XPS, PM-IRRAS, and electrochemical methods (cyclic voltammetry curves and cathodic desorption), the effect of the C(12)H(25)SH concentration on the reduction of the oxide layer has been studied. In all cases, a monolayer of good quality has been obtained. Results provide proof that while the concentration is increased, the thickness of the oxide layer is decreased, to a point that leads to metallic copper for the higher concentration. The results presented in this publication indicate the importance of controlling the interface when forming SAMs of organothiols on oxidizable metals.
Biosensors and Bioelectronics | 2010
C. Volcke; Ram Prasad Gandhiraman; Vladimir Gubala; Jog Raj; Th. Cummins; Gregory Fonder; Robert Nooney; Zineb Mekhalif; Grégoire Herzog; Stephen Daniels; Damien W. M. Arrigan; Attilio A. Cafolla; David E. Williams
Here we have demonstrated a solventless plasma-based process that integrates low-cost, high throughput, high reproducibility and ecofriendly process for the functionalization of the next-generation point-of-care device platforms. Amine functionalities were deposited by plasma-enhanced chemical vapour deposition (PECVD) using a new precursor. The influence of the plasma RF power and the deposition time on surfacial properties, as well as their effect on the reactivity and content of amino groups was investigated. The key process determinants were to have a sufficient power in the plasma to activate and partially fragment the monomer but not too much as to lose the reactive amine functionality, and sufficient deposition time to develop a reactive layer but not to consume or erode the amine reactivity. An immunoassay performed using human immunoglobulin (IgG) as a model analyte showed an improvement of the detection limit by two orders of magnitude beyond that obtained using devices activated by liquid-phase reaction.
Journal of Colloid and Interface Science | 2010
C. Volcke; Ram Prasad Gandhiraman; Vladimir Gubala; Colin Doyle; Gregory Fonder; P.A. Thiry; Attilio A. Cafolla; Bryony James; David E. Williams
In this paper, a new, fast, reproducible technique for atomic force microscopy (AFM) tips functionalization used for chemical interaction measurements is described. Precisely, the deposition of an aminated precursor is performed through plasma-enhanced chemical vapor deposition (PECVD) in order to create amine functional groups on the AFM tip and cantilever. The advantages of the precursor, aminopropyltriethoxysilane (APTES), were recently demonstrated for amine layer formation through PECVD deposition on polymeric surfaces. We extended this procedure to functionalize AFM probes. Titration force spectroscopy highlights the successful functionalization of AFM tips as well as their stability and use under different environmental conditions.
Surface Science | 2009
Gregory Fonder; Francesca Cecchet; A. Peremans; P.A. Thiry; Joseph Delhalle; Zineb Mekhalif
Journal of Electroanalytical Chemistry | 2008
Zineb Mekhalif; Gregory Fonder; Fabrice Laffineur; Joseph Delhalle
Applied Surface Science | 2011
Gregory Fonder; Isabelle Minet; Cédric Volcke; Sébastien Devillers; Joseph Delhalle; Zineb Mekhalif
Journal of Physical Chemistry C | 2010
Francesca Cecchet; Dan Lis; Julien Guthmuller; Benoı̂t Champagne; Gregory Fonder; Zineb Mekhalif; Yves Caudano; Alaa Addin Mani; P.A. Thiry; A. Peremans
Electrochimica Acta | 2010
Gregory Fonder; Cédric Volcke; Balazs Csoka; Joseph Delhalle; Zineb Mekhalif
Journal of Electroanalytical Chemistry | 2008
Zineb Mekhalif; Gregory Fonder; Denis Auguste; Fabrice Laffineur; Joseph Delhalle
Journal of Solid State Chemistry | 2014
A. Malki; Zineb Mekhalif; Simon Detriche; Gregory Fonder; A. Boumaza; A. Djelloul