柔性电子学的高速发展,亟需开发新型高透光率、低电阻的的柔性透明导电薄膜.首先在聚乙烯吡咯烷酮(PVP)存在下,用乙二醇还原硝酸银法合成了银纳米线,并采用氯化铁(FeCl3)调节纳米线的直径和长径比,获得了直径为100 nm、长度为47 μm、分散均匀的银纳米线.然后将银纳米线沉积在聚对苯二甲酸乙二酯(PET)薄膜上形成银纳米线导电薄膜,研究了银纳米线沉积密度和直径对导电薄膜透光率和方阻的影响规律.研究发现,随着纳米线沉积密度的增加,导电薄膜的透过率和方阻都降低,但其品质系数(F.O.M.)增加,最高可达410.当导电薄膜的透光率为80%时,银纳米线直径为35和70 nm的体系具有较低方阻,约132 Ω/□.而且,该导电薄膜还表现出良好的耐弯曲性能.
It is urgently needed to develop novel flexible transparent conductive thin films with high transparency and low sheet resistance as the flexible electronics grows rapidly.Herein, silver nanowires were firstly synthesized through reduction of silver nitrate by ethylene glycol in the presence of polyvinylpyrrolidone (PVP).The nanowire diameter and length were finely tuned by adding ferric chloride (FeCl3), thus uniform silver nanowires with a diameter of 100 nm and length of 47 μm could be obtained.Then, silver conductive thin films were formed by depositing silver nanowires on the poly (ethylene terephthalate) (PET) films.The effects of deposition density and nanowire diameter on the film transmittance and sheet resistance were investigated.It was indicated that when the deposition density increased, both transparence and sheet resistance decreased, but the Figure of Merit (F.O.M) for these films increased, which could up to a maximum of 410.The conductive films based on the silver nanowires with diameters of 35 and 70 nm afforded a relatively low sheet resistance of 132 Ω/□ at the transparency of 80%.In addition, the conductive films showed good electrical and mechanical bending resistance.
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