Thesis defense by Fanny MORISOT

Keywords

ZnO nanowires, ZnO nanonets, DNA biodetection, Acetone electrical detection, Electrical devices, Field Effect transistors

cliquer pour voir la liste des membres du jury/clic here for the jury members

Abstract :
Nanowires are structures combining a diameter of nanometric dimensions and length of micrometric dimension with interesting features for many fields of application such as electronics, optics and molecular detection. However, their small size makes them difficult and costly to integrate into devices. One way to overcome this issue is to assemble them to form a network of randomly oriented nanowires, also called nanonet, which is of macroscopic scale. This work deals with zinc oxide nanonets, which were successfully integrated into three different types of devices: field-effect transistors, DNA sensors and acetone detectors. First, we present the whole fabrication process, from nanowires synthesis to nanonet fabrication and integration into functional devices. Two integration processes were used. The first one involved direct nanonet integration on micro-hotplates with electrodes, provided by our industrial partner, for gaz sensing applications. The second one was a full microelectronic process, which was developed and tested in this work, for the fabrication of field effect transistors. We then discuss the performance of the different devices developed. The fabricated field effect transistors demonstrated remarkable properties which had never been achieved before in the literature for similar devices. We successfully detected DNA by fluorescence and showed the influence of nanowires density on such a sensor. Finally, the electrical detection of gaseous acetone was carried out over a wide range of conditions from dry atmosphere at room temperature to very humid atmosphere at 360°C. This work shows that ZnO nanonets have interesting properties that offer prospects for applications in fields as varied as electronics or the detection of chemical or biological molecules.


Membres du jury/ Jury members :

Prof.Y. Leprince-Wang - ESYCOM, Université Paris-Est Marne-la-vallée, Champs sur Marne (France) - Rapporteur
Prof.K. Aguir - IM2NP, UNiversité Aix-Marseille, Marseille (France) - Rapporteur
Directeur de recherche P. Temple-Boyer - LAAS, CNRS, Toulouse (France) - Examiner
Directrice de recherche J. Boussey - LTM, CNRS, Grenoble (France) - Examiner
Ingénieur T. Livache - Aryballe Technologies, Grenoble (France) - Examiner
Maîtresse de conférence C. Ternon - LMGP, Grenoble INP Minatec, Grenoble (France) - Thesis Director
Directrice de thèse M. Mouis - IMEP-LAHC, CNRS, Grenoble INP Minatec, Grenoble (France) - Thesis Co-director