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Low electrical resistivity of a graphene–AgNHPs based ink with a new processing method

机译：石墨烯-AgNHPs基油墨的低电阻率，采用新的处理方法

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The purification and separation of nano-Ag particles is difficult because of the small size, it restricts the applications of nano-Ag. In this study, the AgNHPs solution was purified and separated with a membrane separation-centrifugation cleaning method, for use as the ink of printed electronics. Meanwhile, we prepared inkjet-printed patterns of conductive inks consisting of AgNHPs and graphene (GE) in different contents. It is found that high dispersity and low electrical resistivity of AgNHPs inks can be obtained by using membrane separation-centrifugation cleaning method. The AgNHPs particles show excellent dispersion and the electrical resistivity of the AgNHPs solution is 11.2 × 10?6 Ω cm at 150 °C, it increases the electrical conductivity of GE–AgNHP. It is also found that GE can significantly improve the electrical conductivity of the patterns when sintering is done at relatively low temperatures. When the GE content is 0.15 mg mL?1, the resistivity is the lowest. For instance, when sintering is done at 150 °C, the resistivity is 2.5 × 10?6 Ω cm that is 13% of that of the AgNHPs conductive ink; after sintering at 50 °C, this ratio is 2%. This study on GE–AgNHPs conductive inks sintered at low temperatures should further the development of flexible touch screens.
机译：纳米银粒子由于其尺寸小而难以纯化和分离，限制了纳米银的应用。在这项研究中，AgNHPs溶液通过膜分离-离心清洗方法进行纯化和分离，用作印刷电子产品的油墨。同时，我们制备了由不同含量的AgNHP和石墨烯（GE）组成的导电油墨的喷墨印刷图案。发现通过使用膜分离-离心清洗方法可以得到AgNHPs油墨的高分散性和低电阻率。 AgNHPs颗粒表现出优异的分散性，并且在150°C时，AgNHPs溶液的电阻率为11.2×10 ？6 Ωcm，它增加了GE–AgNHP的电导率。还发现当在相对较低的温度下进行烧结时，GE可以显着提高图案的电导率。当GE含量为0.15 mg mL ？1 时，电阻率最低。例如，当在150°C下烧结时，电阻率为2.5×10 ？6 Ωcm，是AgNHPs导电油墨的13％。在50°C烧结后，该比例为2％。这项关于在低温下烧结的GE-AgNHPs导电油墨的研究应进一步发展柔性触摸屏。

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