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Dive into the research topics where Gregory Fonder is active.

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Featured researches published by Gregory Fonder.


Journal of Colloid and Interface Science | 2008

Alkanethiol-oxidized copper interface: the critical influence of concentration.

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

Reactive amine surfaces for biosensor applications, prepared by plasma-enhanced chemical vapour modification of polyolefin materials

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

Plasma functionalization of AFM tips for measurement of chemical interactions.

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

Conformational order of n-dodecanethiol and n-dodecaneselenol monolayers on polycrystalline copper investigated by PM-IRRAS and SFG spectroscopy

Gregory Fonder; Francesca Cecchet; A. Peremans; P.A. Thiry; Joseph Delhalle; Zineb Mekhalif


Journal of Electroanalytical Chemistry | 2008

Comparative Assessment of n-Dodecanethiol and n-Dodecaneselenol Monolayers on electroplated copper

Zineb Mekhalif; Gregory Fonder; Fabrice Laffineur; Joseph Delhalle


Applied Surface Science | 2011

Anchoring of alkylphosphonic derivatives molecules on copper oxide surfaces

Gregory Fonder; Isabelle Minet; Cédric Volcke; Sébastien Devillers; Joseph Delhalle; Zineb Mekhalif


Journal of Physical Chemistry C | 2010

Theoretical Calculations and Experimental Measurements of the Vibrational Response of p-NTP SAMs: An Orientational Analysis

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

Electrochemical and spectroscopic study of C12H25X molecules adsorption on copper sheets, X (-SH, -S-S-, -SeH and -Se-Se-)

Gregory Fonder; Cédric Volcke; Balazs Csoka; Joseph Delhalle; Zineb Mekhalif


Journal of Electroanalytical Chemistry | 2008

Impact of the anchoring groups X (–SH, –S–S–, –SeH and –Se–Se–) of CF3(CF2)3(CH2)11X molecules self-assembled on oxidised electroplated copper

Zineb Mekhalif; Gregory Fonder; Denis Auguste; Fabrice Laffineur; Joseph Delhalle


Journal of Solid State Chemistry | 2014

Calcination products of gibbsite studied by X-ray diffraction, XPS and solid-state NMR

A. Malki; Zineb Mekhalif; Simon Detriche; Gregory Fonder; A. Boumaza; A. Djelloul

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Zineb Mekhalif

Université catholique de Louvain

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Joseph Delhalle

Université catholique de Louvain

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C. Volcke

Dublin City University

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