研究目的
To synthesize uniform silver nanowires (AgNWs) with high aspect ratio for fabricating high-performance transparent conductive films (TCFs) using AgCl as seeds through polyol method and to investigate the growth mechanism of AgNWs upon AgCl particles.
研究成果
Uniform AgNWs with thin diameter about 52 nm and aspect ratio above 1000 were synthesized when the reaction temperature was 150 ℃, the molar ratio of [AgNO3] to [AgCl] was 5:1 and the reaction time between AgNO3 and NaCl was 4 min. The fabricated TCFs exhibited high transmittance of 92% at 550 nm with haze of 5.4% and low sheet resistance of 54Ω sq-1 by utilizing a variable spin-speed, 200&1000 rpm which was superior to constant spin-speed for fabricating high-performance TCFs.
研究不足
The study focuses on the synthesis of AgNWs using AgCl seeds and their application in TCFs via spin-coating at variable speeds. The limitations include the specific conditions required for the synthesis and the need for precise control over the reaction parameters to achieve the desired nanowire morphology.
1：Experimental Design and Method Selection:
The AgNWs were synthesized with modified polyol method through introducing AgCl seeds. The growth process of AgNWs was investigated.
2：Sample Selection and Data Sources:
The materials used include PVP (K-90, Mw=1 300 000), silver nitrate (AgNO3), sodium chloride (NaCl), copper chloride (CuCl2), ethylene glycol (EG), ethanol, acetone and ammonia.
3：List of Experimental Equipment and Materials:
The crystalline structure of AgNWs was characterized by X-ray powder diffraction (XRD). The morphologies of NWs were investigated using scanning electron microscopy (SEM, JSM 6360LV, JEOL), field-emission scanning electron microscopy (FE-SEM, NOVA Nano SEM450, FEI), transmission electron microscopy (TEM, JEM 1400, JEOL) and high-resolution transmission electron microscopy(HRTEM, JEM 2100, JEOL).
4：Experimental Procedures and Operational Workflow:
The AgNWs were synthesized by adding AgCl seeds through polyol method. The prepared AgNWs were spin-coated onto a PET substrate at variable spin-speed called 200&1000 rpm to fabricate TCFs.
5：Data Analysis Methods:
The average lengths and diameters of AgNWs were determined by counting one hundred nanowires using ImageJ software. The sheet resistance and transmittance of PET films were tested by four-point probe device (ST2258C, Jingge) and UV-vis spectrophotometer.
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