| 초록 |
In this work, we demonstrate the transparent conducting electrode (TCE) consisting of patterned silver networks, which are successfully embedded in a flexible substrate employing the bimodal-sized Ag nanoparticles (NPs), for high-performance flexible transparent film heaters. Bimodal-sized Ag NPs (1st order (small NPs): ~ 20 nm, 2nd order (big NPs): ~ 200 nm) with excellent electrical conductivity (~ 10-6 Ω∙cm) were readily prepared by one-pot synthesis, which showed a form of well-dispersed Ag ink without any further formulation. Generally, different-sized particles in a conductive ink provide better compactness and electrical conductivity, when they formed a thin film. Although simple mixing of different-sized nanoparticles is more efficient, powder-formed nanoparticles are easily agglomerated together in a mixture without the sophisticated dispersion system. Thus, suggested one-pot reaction is time-effective way to directly prepare the well-dispersed bimodal-sized Ag NP ink. Patterned metal-mesh type TCEs were fabricated by filling the micro-channels on the imprinted flexible substrate using a bimodal-sized Ag ink. By applying certain voltages, they effectively released the heat with performance of 5 ºC/sec. heat-up rate and 0.127 W/cm2 powder density at 90 % transmittance and 1.5 haze value. |
