| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 98 === Because ITO possesses high optical transparency and good conductivity, it has been widely utilized in electrodes of optoelectronic device. However, the mineral resources of indium are limited, the price is high and it is toxic, many researchers seek alternative materials for ITO. This research would like to use silver nanowires to fabricate transparent conductive film in order to replace ITO material.
The seed-mediated growth method was used to synthesize silver nanowires. The Pd reduced from PdCl2 could serve as source of seeds for growth of silver nanowires because of their close match in crystal structure and lattice constants. AgNO3 could be reduced with EG at the temperature of 160℃. Besides, in the presence of poly(vinyl pyrrolidone) (PVP), it would help the formation of silver nanowires.
The experimental results show that the parameters of molecular weight of PVP, the molar ratio of PVP and AgNO3, the PdCl2 seed concentration, and the total amount of reactants would influence the formation of silver nanowire. UV-visible absorption spectra indicate that the product is the silver nanowires, and SEM and TEM were employed to characterize the structures of silver nanowires. From experimental results, we synthesize silver nanowire with a diameter of about 200 nm and a length of about 14.9 um.
Finally, we fabricated the transparent conductive films consisting of random meshes of silver nanowires and used the PEDOT to stabilize the mesh structure. Random meshes of silver nanowires could reduce the sheet resistance greatly after 350℃, 40min heat treatment. In order to maintain good transparency and low sheet resistance, we fabricated the film with an the area density of silver nanowires of 2.62 mg/cm2 and obtained the Ag NW/PEDOT film of 75% optical transmittance and 38.7 Ω/□ sheet resistance.
key word:silver nanowire
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