Gravure Printed Network Based on Silver Nanowire for Transparent Electrode

Silver nanowires were gravure printed on flexbile Poly(ethylene terephthalate) film to form conductive transparent patterns. Suspensions containing silver nanowires with different concentrations were formulated and various cell parameters in grauvre plate were investigated in the printing experiments. Printed samples were characterized by microscope and probes for their optical and electrical properties. It was found that concentration and uniformity of the Ag NW network play key roles in the optical transmission and electrical conductivity of printed films. Experimental result showed that with optimized parameters the transmission of 89% at sheet resistance of 200 Ω/sq have been achieved in the gravure printed transparent conductive films

Low-temperature laser sintering of printed nano-silver electrodes for flexible electronics

In this paper, we demonstrated the continuous wave (CW,1064nm) laser sintering of nano-sliver electrode patterns printed by an aerosol jet printer on polyethylene terephthalate (PET) substrate. A laser sintering apparatus has been constructued which has precise control of laser spot size to 15um and can effectively minimize the damage of substrates and other functional layer in multilayer devices. The effects of the laser processing parameter on the sintering results including scanning speed and power were investigated. The electrical resistivity of laser sintered nano-silver electrode was measured to be 2.4 &times; 10^{<font size="2">-6</font>}&Omega;m which is similar to that achieved in conventional oven sintering

Fabrication and electrical properties of all-printed carbon nanotube thin film transistors on flexible substrates

In this manuscript, we developed a high-performance, printable and water-based semiconducting SCNT ink, and fabricated all printed chemically functionalized CoMoCat 76 SCNT thin film transistors (TFTs) on flexible substrates via a suite of printing technologies. The metallic species in the pristine CoMoCat 76 SCNTs were effectively eliminated by organic radicals, and the functionalized SCNTs were characterized by UV-Vis-NIR spectroscopy and Raman spectra. The high quality, printable and water-based functionalized SCNT inks were obtained by tuning the ink ingredients, such as the concentrations of surfactants and additives. The printing methods we investigated include inkjet printing, aerosol jet printing and a hybrid with nanoimprinting. Large area source and drain electrode patterns were first fabricated on flexible substrates by a hybrid printing method, and then the optimal SCNT ink was printed on the channel of the TFT devices by ink-jet printing. Subsequently, the silver side-gate electrode and ion gel dielectric layer were deposited by aerosol jet printing. The all-printed flexible TFTs exhibited an effective mobility up to 1.5 cm2 V 1 s1 and an on/off ratio up to 4 103. This work opens up a way to fabricate scalable and all-printed flexible electronics, and it is of benefit to generalize the practical applications of flexible electronics in the future