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Issue 39, 2011
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Flexible transparent conductive coatings by combining self-assembly with sintering of silver nanoparticles performed at room temperature

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Abstract

Transparent conductive coatings are essential for fabrication of a variety of printed electronic devices such as flexible displays and solar cells. We report on a simple method to obtain such coatings by using aqueous dispersions of silver nanoparticles in an evaporative lithography process which is performed directly onto plastic substrates. In essence, a droplet containing silver nanoparticles is placed on top of a metallic mesh, instantaneously spreading over the mesh and the plastic substrate, and after the flow of the dispersion towards the wires of the mesh and drying, a transparent grid composed of the nanoparticles is formed. The silver nanoparticles are tailored to self-sinter upon short exposure to HCl vapors, due to the presence of polyacrylic acid salt on the surface of the particles. Therefore, immediate sintering of the silver nanoparticles in the thin lines of the grid occurs even at room temperature, enabling formation of transparent, flexible conductive grid on heat-sensitive substrates. The process yielded a conductive array having a very low sheet resistance, 9 ± 0.8 Ω/□, and a transparency above 75%. The application of the flexible conductive grid, which can replace conventional and expensive ITO, is demonstrated in an electroluminescent (EL) device.

Graphical abstract: Flexible transparent conductive coatings by combining self-assembly with sintering of silver nanoparticles performed at room temperature

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Article information


Submitted
08 Jul 2011
Accepted
27 Jul 2011
First published
30 Aug 2011

J. Mater. Chem., 2011,21, 15378-15382
Article type
Paper

Flexible transparent conductive coatings by combining self-assembly with sintering of silver nanoparticles performed at room temperature

M. Layani and S. Magdassi, J. Mater. Chem., 2011, 21, 15378
DOI: 10.1039/C1JM13174E

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