柔性纳米银线导电薄膜的制备及其性能研究

Preparation and properties of silver nanowire network transparent conductive films on PET flexible substrate

通过2步加入多元醇热还原法制备出了高长径比的纳米银线,并在柔性基材上制备兼具透光性和导电性的薄膜;对薄膜与基材的粘接性能进行了改善。采用X-射线衍射（XRD）、扫描电子显微镜（SEM）、场发射透射电子显微镜（FETEM）对纳米银线的相结构及形貌进行了分析及表征。薄膜的透光率和导电性分别通过紫外-可见分光光度计和四探针进行了研究。制备的纳米银线的直径约为50 nm,长径比为200-300。研究了银线浓度以及用量对真空抽滤转移法制备薄膜的透光率及导电性的影响,发现当银纳米线的浓度为0.025mg/mL,薄膜的透光率为71.0%时,方块电阻为65.5Ω/sq。所制备的薄膜在基材上的粘接性通过旋涂一层聚偏氟乙烯（PVDF）,并经热处理后,粘接性和导电性（方阻为18.0Ω/sq）都有所提高。

In this study,the silver nanowires with high length-to-diameter ratio were successful synthesized by the two-step injection polyol method were the film with both light transmittance and electrical conductivity on the flexible substrate was prepared,and the adhesion propertie between the nanowire and the substrate were improved sharply. The structure of silver nanowires was measured by XRD, and their morphology was characterized by SEM and FETEM. The light transmittance of the film was obtained by UV spectrometer and the square resistance was obtained by four-probe method. The diameter of prepared silver nanowires was about 50 nm, and their aspect ratio scope was within 200-300.The influence of concentration and content of the silver nanowires on the light transmittance and electrical conductivity of vacuum filtration transfer film was studied. When the concentration was 0.025 mg/ml, the best performances of silver nanowires film were as follows： the light transmittance of the film was 71.0% and the sheet resistance of 65.5 Ω/sq. And the adhesion and electrical conductivity of the prepared film on the substrak were improved after spin-coating a layer of PVDF and heat treating,the sheet resistance was 18.0 Ω/sq.