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Abstract
Transparent, conductive, and flexible silver nanowire (AgNW) films have been fabricated by a facile two-step method. Firstly, the well-dispersed AgNW suspension is vacuum filtered using mixed esters of cellulose (MCE) membranes as filters. Then, the AgNW-MCE films are treated with acetone vapor. After the infiltration of acetone vapor, the white and porous MCE membranes change into transparent and pore-free, and AgNW-MCE films are obtained with extraordinary optical, conductive, and mechanical properties. An optimal result is obtained with transmittance of 85% at 550 nm and sheet resistance about 50 Ohm/sq. The flexibility of AgNW-MCE films is remarkable, which is comparable to that of the AgNW film on flexible polyethylene terephthalate (PET). More important, AgNW-MCE films show an excellent adhesion to the substrate, which causes a stable electrical conductivity even after scotch tape test and finger friction test. As a result of improved adhesion to the substrate, the sheet resistance of AgNW-MCE films is about 20% smaller than that of AgNW-PET films.
Highlights
Nowadays, as optoelectronic technology will move toward flexible and paper-like devices, great efforts have been made to search for suitable electrode materials which can be formed into films at low temperature and used in such applications
Indium tin oxide (ITO) as the most important transparent and conductive film (TCF) has been widely used in optoelectronics for 50 years, but it is completely unsuitable to flexible devices because of its brittle nature [1]
After treated with acetone vapor, the transmittance of the mixed esters of cellulose (MCE) membrane is over 90%, which is high enough as a matrix of TCF
Summary
As optoelectronic technology will move toward flexible and paper-like devices, great efforts have been made to search for suitable electrode materials which can be formed into films at low temperature and used in such applications. Many promising materials have been emerging such as graphenes, carbon nanotubes, and metal nanowires [2,3,4,5,6] For these materials, one of the most important advantages is that the flexibility does not come at the cost of performance in terms of sheet resistance and transparency [7]. Vacuum filtration is a low-temperature process in film production, which affords films with some advantages such as surface uniformity, high electric conductivity, and controllable thickness It has been widely used for fabricating AgNW films [4, 5]. Esters of cellulose (MCE) membrane, used as the filter, can become transparent and pore-free [11], the transfer process would be eliminated
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