Scalable Approaches to Copper Nanocrystal Synthesis under Ambient Conditions for Printed Electronics,ACS Applied Nano Materials

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Scalable Approaches to Copper Nanocrystal Synthesis under Ambient Conditions for Printed Electronics
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-03-30 , DOI: 10.1021/acsanm.0c00242
Arnau Oliva-Puigdomènech ₁ , Jonathan De Roo ₂ , Hannes Van Avermaet ₁ , Klaartje De Buysser ₃ , Zeger Hens _{1,

4}

Affiliation

We demonstrate the synthesis of copper nanocolloids by the thermal decomposition of copper formate in oleylamine under ambient conditions. By progressively increasing the loading of copper formate in the reaction mixture and imposing sufficiently high conversion rates, we demonstrate the formation of nanocrystals that are more than 97% pure copper without using an inert atmosphere. We attribute this result to the excess of copper formate relative to initially dissolved oxygen, and to the suppression of oxygen influx in the reactor. By adjusting the precursor and ligand concentrations, we obtain copper nanocrystals with sizes ranging from 10 to 200 nm. In view of applications, we show that the reaction can be upscaled to a 1 L reaction volume to produce over 50 g of copper nanocrystals. Moreover, we formulate a conductive ink based on the copper nanocolloids obtained here with which we printed copper films exhibiting a resistivity of 23 μΩ cm after thermal sintering under N₂. We conclude that the approach presented here constitutes a next step toward the cost-effective production of metallic copper nanocrystals for printed electronics.

中文翻译：

印刷电子在环境条件下合成铜纳米晶体的可扩展方法

我们证明了在环境条件下油酸胺中甲酸铜的热分解可合成铜纳米胶体。通过逐步增加反应混合物中甲酸铜的负载量并施加足够高的转化率，我们证明了在不使用惰性气氛的情况下形成了纯度超过97％的纯铜的纳米晶体。我们将此结果归因于相对于最初溶解的氧气而言，甲酸铜的过量，以及对反应器中氧气流入的抑制。通过调整前体和配体的浓度，我们获得了尺寸在10到200 nm之间的铜纳米晶体。鉴于应用，我们表明该反应可以放大至1 L反应体积，以生产超过50 g的铜纳米晶体。此外，₂。我们得出的结论是，此处介绍的方法构成了向经济高效地生产用于印刷电子产品的金属铜纳米晶体的下一步。

更新日期：2020-03-30

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