Nanoparticle Sensor Arrays on Flexible Substrates

Ασλανίδης, Ευάγγελος

dc.contributor.author	Ασλανίδης, Ευάγγελος
dc.date.accessioned	2021-12-22T08:44:05Z
dc.date.available	2021-12-22T08:44:05Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/54225
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.21923
dc.rights	Default License
dc.subject	Νανοσωματίδια	el
dc.subject	αισθητήρες	el
dc.subject	Νανοτεχνολογία	el
dc.subject	προσομοίωση	el
dc.subject	παραμόρφωση	el
dc.subject	nanoparticles	en
dc.subject	sensors	el
dc.subject	nanotechnology	el
dc.subject	simulation	el
dc.subject	strain	el
dc.title	Nanoparticle Sensor Arrays on Flexible Substrates	en
dc.contributor.department	Φυσικής	el
heal.type	doctoralThesis
heal.classification	Φυσική	el
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2021-04-22
heal.abstract	The main subject of the current thesis is the development and study of operation of metallic nanoparticle-based flexible strain sensors. In addition, it is presented how Al2O3 (alumina) thin films were developed by Atomic Layer Deposition (ALD) for sensors protection against humidity. A study concerning the strain sensor’s characteristics before and after the deposition of alumina was carried out. Additionally, the already existing theory that describes the behavior of nanoparticles-based strain sensors was enriched in order to include the sputtering made nanoparticles. Throughout our study was successfully determined the critical thickness of the alumina film for the isolation and sufficient protection of nanoparticles from humidity. Apart from that, a Monte Carlo simulation tool that was written in Matlab, is developed to predict the sensitivities of various nanoparticle film under strain. This tool is capable of predicting the strain-sensitivity for different nanoparticle diameters as well as surface coverages, emerging as a powerful computational tool for design and optimization of nanoparticle based devices, while it could be extended to other nanocomposite materials used in flexible or stretchable electronic applications. Moreover, highly sensitive flexible strain sensors formed by a network of metallic nanoparticles on top of a cracked thin alumina film were fabricated and discussed. Sensors’ sensitivity depends on the nanoparticles’ surface density as well as on the thickness of alumina thin films. Both can be well controlled via the deposition techniques. A record strain sensitivity value of 2.6 × 108 was achieved by the sensors at 7.2% strain, while exhibiting high sensitivity in a large strain range from 0.1% to 7.2%. The demonstration is followed by a discussion enlightening the physical understanding of sensor operation, which enables the tuning of its performance according to the above process parameters. Finally, a strain sensor array was develop on a glove and measured by a custom made circuit. The measurements of the circuit were compared with measurements from a Keithley 2400 and found to be very precise in the operational range of the circuit.	el
heal.sponsor	I acknowledge support from the International Consortium of Nanotechnologies (ICON) coordinated by the University of Southampton and funded by Lloyd’s Register Foundation, a charitable foundation which helps to protect life and property by supporting engineering-related education, public engagement and the application of research.	el
heal.advisorName	Τσουκαλάς, Δημήτρης
heal.committeeMemberName	Ράπτης, Ιωάννης
heal.committeeMemberName	Ζεργιώτη, Ιωάννα
heal.committeeMemberName	Παπαβασσιλείου, Χρήστος
heal.committeeMemberName	Προδρομάκης, Θέμης
heal.committeeMemberName	Κυρίτσης, Απόστολος
heal.committeeMemberName	Χριστοφόρου, Ευάγγελος
heal.academicPublisher	Σχολή Εφαρμοσμένων Μαθηματικών και Φυσικών Επιστημών	el
heal.academicPublisherID	ntua
heal.fullTextAvailability	false