Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China.
Nanoscale. 2014;6(3):1622-8. doi: 10.1039/c3nr05479a.
Silver nanoparticles (NPs) which could be kept in solid form and were easily stored without degeneration or oxidation at room temperature for a long period of time were synthesized by a simple and environmentally friendly wet chemistry method in an aqueous phase. Highly stable dispersions of aqueous silver NP inks, sintered at room temperature, for printing highly conductive tracks (∼8.0 μΩ cm) were prepared simply by dispersing the synthesized silver NP powder in water. These inks are stable, fairly homogeneous and suitable for a wide range of patterning techniques. The inks were successfully printed on paper and polyethylene terephthalate (PET) substrates using a common color printer. Upon annealing at 180 °C, the resistivity of the printed silver patterns decreased to 3.7 μΩ cm, which is close to twice that of bulk silver. Various factors affecting the resistivity of the printed silver patterns, such as annealing temperature and the number of printing cycles, were investigated. The resulting high conductivity of the printed silver patterns reached over 20% of the bulk silver value under ambient conditions, which enabled the fabrication of flexible electronic devices, as demonstrated by the inkjet printing of conductive circuits of LED devices.
通过一种简单且环保的湿化学方法在水相中合成了可以保持固态并在室温下长时间保存而不会退化或氧化的纳米银颗粒（NPs）。通过将合成的银 NP 粉末分散在水中，可简单制备出在室温下烧结的、用于打印高导电性迹线（约 8.0 μΩ cm）的高稳定性水性银 NP 油墨分散体。这些油墨稳定、相当均匀，适用于广泛的图案化技术。使用普通彩色打印机可成功地将这些油墨打印在纸张和聚对苯二甲酸乙二醇酯（PET）衬底上。在 180°C 退火后，印刷银图案的电阻率降低至 3.7 μΩ cm，接近纯银的两倍。研究了影响印刷银图案电阻率的各种因素，如退火温度和打印循环次数。在环境条件下，打印银图案的高导电性达到了纯银的 20%以上，这使得能够制造柔性电子设备，如通过喷墨打印 LED 器件的导电电路所证明的那样。
