Leitner Jindřich, Sedmidubský David, Lojka Michal, Jankovský Ondřej
Department of Solid State Engineering, Faculty of Chemical Technology, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic.
Department of Inorganic Chemistry, Faculty of Chemical Technology, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic.
Materials (Basel). 2020 Jun 26;13(12):2878. doi: 10.3390/ma13122878.
Copper nanoparticles are of great interest in various applications, such as catalysis, cooling fluids, conductive inks or for their antibacterial activity. In this paper, the thermal behavior of copper nanoparticles was studied using thermogravimetry, differential thermal analysis and differential scanning calorimetry. Original Cu samples as well as the products of oxidation were analysed by X-ray diffraction, scanning/transmission electron microscopy and energy dispersive spectroscopy. A step-by-step oxidation mechanism during the oxidation of Cu nano-powders was observed. The Cu-nano oxidation starts slightly above 150 °C when bulk copper does not yet react. The dominant oxidation product in the first step is CuO while CuO was identified as the final state of oxidation. Our results confirm an easier oxidation process of Cu-nano than Cu-micro particles, which must be attributed to kinetic not thermodynamic aspects of oxidation reactions.
铜纳米颗粒在各种应用中极具吸引力，例如催化、冷却液、导电油墨或因其抗菌活性。本文采用热重分析、差示热分析和差示扫描量热法研究了铜纳米颗粒的热行为。通过X射线衍射、扫描/透射电子显微镜和能量色散光谱对原始铜样品以及氧化产物进行了分析。观察到铜纳米粉末氧化过程中的逐步氧化机制。当块状铜尚未反应时，铜纳米颗粒的氧化在略高于150℃时开始。第一步中的主要氧化产物是CuO，而CuO被确定为氧化的最终状态。我们的结果证实，与铜微粒相比，铜纳米颗粒的氧化过程更容易，这必须归因于氧化反应的动力学而非热力学方面。
