首先以硝酸银作为银源,制备出柠檬酸银和碳酸银,然后以柠檬酸银和碳酸银为金属前驱体化合物,异丙胺为络合剂,甲醇为还原剂,另加入少量添加剂以调节粘度和表面张力等物理参数,制得无颗粒银导电墨水.该银导电墨水可以采用A4平板打印机在PET(Polyethylene terephthalate)上打印图案,并在较低的热处理温度下即可获得导电性较好的银膜.利用X射线衍射仪、扫描电子显微镜、四探针测试仪、接触角测量仪、傅里叶变换红外光谱仪、热分析仪对柠檬酸银、碳酸银、导电墨水及导电银膜进行测试表征.结果表明导电墨水经130℃热处理之后,导电银膜由均匀的纳米银颗粒组成;经130℃热处理40 min后,得到的银膜的方块电阻可低至0.84 Ω·□1,可广泛用于电子印刷行业.
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