UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-21 16:00
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Conference: Bucharest University Faculty of Physics 2008 Meeting


Section: Electricity and Biophysics


Title:
Localized nanowires arrays, used for increasing the sensitivity in capacitive pH sensing devices. fabrication and measuring techniques


Authors:
Adrian Radu(1), Vlad Antohe(2), Sami Yunus(2), Alexandru Vlad(3), Stefan Mátéfi-Tempfli(2), Luc Piraux(2), Liviu Giurgiu(1), Lucian Ion(1) and Stefan Antohe(1)


Affiliation:
1)Department of Materials and Electronic & Optoelectronic Devices, University of Bucharest, Atomistilor Street 405,

Bucharest – Magurele, 077125, Romania (www.mdeo.eu)

2)Unité de Physico-Chimie et de Physique des Matériaux, Université Catholique de Louvain, Place Croix du Sud 1,

Louvain-la-Neuve, B-1348, Belgium (www.pcpm.ucl.ac.be)

3)Unité de Dispositifs Intégrés et Circuits Electroniques, Université Catholique de Louvain, Place de Levant 3,

Louvain-la-Neuve, B-1348, Belgium (www.dice.ucl.ac.be)


E-mail
adrian.radu@mdeo.eu


Keywords:


Abstract:
Today, one of the great challenges in biotechnology is to find reliable techniques for the fabrication of sensing devices in the nanometer scale as well as for increasing their active surface in order to reach high detection sensitivities. These techniques require advanced nanostructuring methods for tuning and controlling their positions and geometries, for further large-scale integration. Here, we focus on fabrication of metallic nanowires arrays, localized and confined to small interdigitated electrodes structures. The interdigitated structures are made using optical lithography, while the nanowires arrays are made using electrochemical synthesis in nanoporous materials (i.e. supported alumina templates). Based on these considerations, a capacitive sensor structure with high active surface is described, for pH detection. Different measuring techniques used for extracting the capacitive components of this structure are also depicted. We show that by growing and localizing perpendicular nanowires arrays (on top of its active surface), we can substantially increase the pH detection efficiency of the sensor.