MATETPRO - Matériaux et Procédés pour Produits Performants

Transparent printable thin film heaters made of metallic nanowires for defogging/deicing – FICHTRE

Submission summary

This project aims to develop a new kind of low-cost transparent film heaters for defogging / defrosting devices. The goal is to develop flexible and conformable thin film heaters from silver or copper nanowires, using a large scale printing process. These materials must replace more expensive traditional transparent conductors, which have environmental and cost issues. The project will lead to the fabrication of defogging / deicing protective visors.

The study will include:

-The synthesis of nanowires in solution, their functionalization and characterization,
-Fabrication of percolating nanowire networks through large surface low temperature printing techniques,
-The thermal, electrical and mechanical characterizations of the films, as well as the optimization of their properties by coupling experimental studies, modeling and simulation,
-The design, implementation, and testing of several demonstrators for industrial use.

It will demonstrate the relevance of this innovative material and its manufacturing process. In addition, a study of ecodesign and life cycle analysis of the product will be conducted in parallel to the process development. The results of this study will be used throughout the project to guide the technical choices for the best fabrication process.
Current techniques for the manufacture of transparent film heaters are based on the use of films of transparent conductive oxides (TCOs) and more particularly ITO (indium tin oxide). There are several reasons to get rid of these materials. 1 / A strategic reason: indium is a critical metal whose price is high and unpredictable 2 / A technical reason: the ITO is very brittle 3 / A process reason: the processes needs large capex , are in vacuo and are limited to flat surfaces.
There is currently a lack of heating elements with heating properties at low voltage, high transparency and flexibility. This is the type of material and with its deposition method we propose to develop, by relying on the very recent development of metallic nanowire networks. These, essentially based on silver and copper, allow the realization of thin film heaters, which can be used for the manufacture of defogging / deicing films targeted in this project. Very encouraging preliminary tests have been achieved in this direction which validates the relevance of the subject.
Among the advantages inherent in the method developed in the project, it will be possible to apply these heating films on any surface by the spray technique.
The consortium is composed of three industrial partners whose business areas are directly related to the intended application, and academic partners with complementary skills able to solve all the scientific and technological issues of the project (optical, thermal, electrical, mechanical, multi-physics simulation) and implement the material into industrial demonstrators.
This Industrial Research project involves the acquisition of knowledge and skills on a new kind of flexible transparent conductive materials to develop new systems with efficient defrosting performances. The main application is considered in the short term, however it is a project breakthrough: the target material is new and might find other applications when we have demonstrated the concept, such as braces, flexible electronic devices, comfort elements...

Project coordination

Jean-Pierre SIMONATO (Commissariat à l'Energie Atomique et aux Energies Alternatives)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


id3 id3 Technologies
CEA/Liten Commissariat à l'Energie Atomique et aux Energies Alternatives
IMN-CNRS Institut des Matériaux de Nantes, CNRS
Grenoble INP Grenoble Institut Polytechnique
CCI Saint Etienne Montbrison CCI St Etienne Montbrison

Help of the ANR 983,423 euros
Beginning and duration of the scientific project: January 2014 - 42 Months

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