草酸处理制备抗氧化的纳米铜导电油墨

Preparation of Antioxidative Copper Conductive Ink by Oxalic Acid Treatment

目的研究制备抗氧化纳米铜的化学方法,以提高纳米铜油墨的导电性。方法液相还原法制备纳米铜,在乙醇中用草酸处理后,混合丙烯酸树脂配成导电油墨,丝网印刷于PI膜上。对纳米铜和铜膜进行XRD,TEM,SEM,XPS表征。结果经草酸处理后,铜膜导电性得到显著提高,250℃真空烧结1 h,电阻率低至24.1μΩ·cm。结论经草酸处理的纳米铜油墨具有抗氧化性,导电性满足印刷电子要求。

To improve the conductivity of nano-copper ink, a simple chemical process was presented to synthesize oxidation-resistant copper nanoparticles. The copper nanoparticles synthesized by aqueous reduction method were treated by oxalic acid in ethanol. And the particles were then mixed with acrylic resin to prepare conductive ink which was used to fabricate conductive copper patterns on polyimide films by screen printing. TEM, SEM, XRD and XPS were conducted to characterize the synthesized copper nanoparticles and films. After oxalic acid treatment, the copper film showed higher conductivity and its resistivity was as low as 24.1 μΩ·cm after being annealed in the vacuum oven at 250℃ for one hour.With superior oxidative stability and good conductivity, the copper conductive ink treated by oxalic acid is proper for printing electronics.