Roberson David A, Wicker Ryan B, Murr Lawrence E, Church Ken, MacDonald Eric
Department of Metallurgical and Materials Engineering, The University of Texas at El Paso, El Paso, TX 79968, USA.
W. M. Keck Center for 3D Innovation, The University of Texas at El Paso, El Paso, TX 79968, USA.
Materials (Basel). 2011 May 26;4(6):963-979. doi: 10.3390/ma4060963.
Conductive inks are key enablers for the use of printing techniques in the fabrication of electronic systems. Focus on the understanding of aspects controlling the electrical performance of conductive ink is paramount. A comparison was made between microparticle Ag inks and an Ag nanoparticle ink. The microstructures resulting from thermal cure processes were characterized morphologically and also in terms of their effect on the resistivity of printed traces. For microparticle inks, the variability of resistivity measurements between samples as defined by coefficient of variation (CV) was greater than 0.1 when the resistivity was 10 to 50 times that of bulk Ag. When the resistivity was lower (~1.4 times that of bulk Ag) the CV of sample sets was less than 0.1. In the case of the nanoparticle ink, resistivity was found to decrease by a factor ranging from 1.2 to 1.5 after doubling the amount of layers printed prior to curing though it was expected to remain the same. Increasing the amount of layers printed also enhanced the sintering process.
导电油墨是在电子系统制造中使用印刷技术的关键推动因素。专注于理解控制导电油墨电性能的各个方面至关重要。对微粒银油墨和银纳米颗粒油墨进行了比较。对热固化过程产生的微观结构进行了形态表征，并就其对印刷线路电阻率的影响进行了表征。对于微粒油墨，当电阻率为块状银的10至50倍时，由变异系数（CV）定义的样品间电阻率测量的变异性大于0.1。当电阻率较低（约为块状银的1.4倍）时，样品组的CV小于0.1。在纳米颗粒油墨的情况下，尽管预期固化前印刷层数加倍后电阻率应保持不变，但发现其电阻率降低了1.2至1.5倍。增加印刷层数也增强了烧结过程。
