Atmospheric pressure PLASMA deposition of PLASMONIC coatings ON a WIRE substrate


CALL: 2013

DOMAIN: MS - New Functional and Intelligent Materials and Surfaces


LAST NAME: Choquet




KEYWORDS: surface treatment - plasma assisted CVD - smart nanocomposite materials - photocatalytic surfaces - wire deposition - atmospheric plasma process - mechanical simulation - optical fiber - water disinfection - thin film growt mechanisms - gradient layer - nanoparticule synthesis

START: 2014-06-01

END: 2017-05-31


Submitted Abstract

Many semiconductors, including ZnO, Fe2O3, WO3, Bi2O3, …, have been investigated for solar applications. Wide band gap semiconducting photocatalysts show higher photocorrosion stability compared to narrow band gap materials. Among them titanium dioxide (TiO2), preferentially in the anatase form, has been the candidate of choice and has received considerable research interest. As UV light representing approximately 2 percent of the energy distribution within the solar spectrum, most of the photons are wasted and consequently, a lot of effort has been spent on the extension of the photocatalytic activity of TiO2 to the visible wavelengths. The embedment or sensitisation of nanometre-sized dyes has been reported to make TiO2 efficient under visible light of the solar spectrum.The potentialities of this material could be largely increased if synthesis conditions as been determined to deposit it as a thin film on thermal sensitive and flexible substrates. Atmospheric pressure plasma assisted chemical vapour deposition (AP-PACVD) is known to be a flexible technique that can offer a large range of process parameters and by this way, possibility to well tailor the structural and chemical properties.The PLASONWIRE project, focusing on noble metal NPs and TiO2 system, propose to deeper study the mechanisms involved in the deposition of such coatings by AP-PACVD. An extensive characterisation of the plasma gas phase and coating properties will provide an insight of the gas phase and surface reactions occurring during the process. The parameters influencing these reactions will be tuned and a synergic effect between the homogeneous gas phase reactions, usually more favourable for the formation of noble-metal NPs and titania anatase crystallites, and the heterogeneous reactions occurring at the surface, leading to higher-quality coatings will be sought to deposit effective nanocomposite coatings. This project also aims at depositing nanocomposite coatings in a continuous deposition process in order to produce new functional and intelligent fibres in an efficient way and consequently, fundamental studies will also be necessary to understanding growth mechanisms at high deposition rate (defect density in relation with photocatalytic yield) on dynamic substrates. Through a predictive approach, the nanocomposite coating characteristics will be optimised in order to also withstand the substrate deformation. A predictive model, using Abaqus FEA, will be developed to help to the design of a sustainable coating on flexible optical fibres. Based on a two scale Finite Element (FE) modelling, this task will allow to predict the effective deformation behaviour of nanocomposite coatings. As an example of potential application, it is planned to deposit noble metal NPs-TiO2 on optical fibres for the manufacturing of a water decontamination reactor. The combination of a light conveyor substrate offering large interaction surfaces and a photocatalytic coating is of great interest and will be investigated for the destruction of pathogenic microorganisms and antibiotics. The decontamination of antibiotics, namely amoxicilline and fluoroquinolones, and their degradation mechanisms will be investigated notably through the antibiotics structure changes. In conclusion, PlasmOnWire proposes a complete theoretical and experimental investigations where for the first time, the impact of crystalline structure of TiO2 doped with NPs will be carefully characterized regarding the photocatalytic properties and the deformation properties.

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