Translated Abstract
As the electronics industry has evolved by leaps and bound, the demand of realizing flexible electronics devices is quite urgent. So developing a new flexible, transparent and conductive film to replace the traditional ITO conducive glass is really important. The main contents of our research strats from the new transparent and conductive nano material: silver nanowires(AgNW), and then focus on the developing of flexible, transparent and conductive film which is consisted of AgNWs, and the specific contents are as follow:
1. The controllable preparation of AgNWs with high aspect ratio
We focus on the synthesis of AgNWs with high aspect ratio which can be controlled by using electrical heater. During the experimental process, ethylene glycol is used as solvent and reducing agent, AgNO3 provides the silver element and PVP (polyvinylpyrrolidone) is used as surfactant. When NaCl is taken as catalyst, we take the control variate method to find out the best concentration of AgNO3 and find out the best reaction time. Furthermore, we research the catalytic mechanism of the catalyst and modify the catalyst, replacing NaCl with FeCl3 and find the best reaction time in this case. During this process, a good method which is suitable for mass production has been found.
2. Highly Transparent, Conductive and Flexible Resin Films Embedded with AgNW
In this research, a low sheet resistance and highly transparent AgNW resin composite film (16μm) was demonstrated, which was prepared by a simple and efficacious two-step spin-coating method. By burying the AgNWs below the surface of the transparent resin matrix which cured at 150℃ in air，we achieved a uniform, highly transparent, conductive and flexible film. Compared to the reported transparent electrodes, this composite transparent and conductive film(16μm) showed 10Ω/□ of sheet resistance and nearly 90% mean optical transmittance over the UV-visible range simultaneously. Undergoing hundreds of cycles of tensile and compression folding, the sheet resistance of the composite film slightly increased less than 5%, displaying good electromechanical flexibility. We then apply the composite film in the standard organic light emitting diode(OLED), and analyse the characteristics of the flexible OLED.
3. A high-performance , ultrathin and flexible sandwich graphene/AgNW/polymer hybrid transparent electrode and its applications
We first place the Alfa copper foil in a chemical vapor deposition system to grow the monolayer graphene, and then use the wet-transfer, spin coating method and low temperature, liquid nitrogen thin film extracting method to fabricate the graphene-AgNW-polymer composite film(8μm) with the sandwitch structure, and it exhibits the superior optoelectronic charactersics with sheet resistance of 8.06Ω/□ and optical transmittance of 88.3%. And this specific top-down transfer-encapsulation-transfer fabrication process could make the composite film achieve high mechanical robustness, the flat film surface (RMS=2.58 nm) and good chemical stability. Considering all these advantages, we employ this electrode to fabricate the simple standard flexible organic light-emitting device, which exhbit the considerable performance.
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