Dia Mundial dos Materiais 2008

Prémio SPM

 

Papel Interactivo – Produção e caracterização de dispositivos electrocrómicos em papel

 

Nuno Correia^*, Cláudia Costa, Alexandra Gonçalves, Sónia Pereira, Elvira Fortunato, Rodrigo Martins

 

Universidade Nova de Lisboa-Faculdade de Ciências e Tecnologias, Departamento de Ciência de Materiais,

Campus de Caparica, 2829–516 Monte de Caparica, Portugal.

* nfc11178@fct.unl.pt

 

 

RESUMO:

Neste trabalho produziram-se dispositivos electrocrómicos em diversos substratos de papel. Um dispositivo electrocrómico consiste no empilhamento de diferentes camadas (substrato/eléctrodo/electrocrómico/ electrólito/contra-eléctrodo/eléctrodo/substrato). Ao ser aplicada uma diferença de potencial entre os eléctrodos o material electrocrómico alterna entre um estado colorido ou descolorido conforme a polarização. Estes dispositivos têm sido alvo de grande interesse por parte da comunidade científica, especificamente na procura de novos substratos mais leves, fléxíveis e de baixo custo. Nesse sentido estudou-se o papel como substrato para o dispositivo. Efectuou-se a caracterização morfológica, eléctrica, estrutural e óptica. Transportar a tecnologia do electrocromismo para um substrato como o papel revelou desafios inerentes às características singulares deste material, devido à sua fragilidade e grande irregularidade superficial. No entanto adicionar esta funcionalidade a um material tão comum não só aumenta o seu valor como revela novas oportunidades no mercado da electrónica descartável.

Palavras chave: Substrato de papel, celulose, dispositivos electrocrómicos, WO₃, electrónica descartável.

 

 

ABSTRACT:

This work reports the production of electrochromic devices on paper substrates. An electrochromic cell is composed by several layers (substrate/electrode /electrochromic/electrolyte/counter-electrode/electrode/substrate). Applying a potential difference between electrodes will result in an alternate change of the electrochromic material from colored to bleached state. These devices have gained interest in the scientific community specifically in the search for new lightweight, flexible and low cost substrates. Morphological, electrical, structural and optical characterization was made. Combining electrochromic technology with paper revealed singular challenges inherent to this material, due to its fragility and surface roughness. However adding this functionality to such a common material not only increases its value but also provides new opportunities for the disposable electronic market.

Keywords: Paper substrate, cellulose, electrochromic devices, WO₃, disposable electronics.

 

 

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