Jo Yong-Su, Lee Hui-Jung, Park Hye-Min, Na Tae-Wook, Jung Jin-Seung, Min Seok-Hong, Kim Young Keun, Yang Seung-Min
Functional Materials and Components R&D Group, Korea Institute of Industrial Technology, Gangneung, Gangwon-do 25440, Republic of Korea.
Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.
ACS Omega. 2021 Oct 13;6(42):27842-27850. doi: 10.1021/acsomega.1c03468. eCollection 2021 Oct 26.
Nickel (Ni) nanoparticles (NPs) prepared through vapor-phase synthesis (VPS) are preferred for multilayer ceramic capacitor electrodes due to their high purity and crystallinity advantages. Agglomerated Ni NPs are usually generated using VPS but are undesirable because they cause various problems such as low packing density and electrical shorts. This study proposes the use of coating-assisted chemical vapor synthesis (CVS) for agglomerate inhibition using NaCl or KCl as a coating agent. We have found that the agglomeration ratio, 34.40%, for conventional CVS, can be reduced to 4.80% in the proposed method by in-flight coating with KCl at 900 °C by image analysis using field-emission scanning electron microscopy. Furthermore, the X-ray diffraction and X-ray fluorescence analyses confirm that the NaCl and KCl coating agent can be removed by washing with distilled water. We believe that this coating process can be used to inhibit the formation of agglomerates during the CVS of Ni NPs.
通过气相合成（VPS）制备的镍（Ni）纳米颗粒（NPs）由于其高纯度和结晶度优势，是多层陶瓷电容器电极的首选材料。团聚的Ni NPs通常是通过VPS生成的，但这是不理想的，因为它们会导致各种问题，如低堆积密度和电气短路。本研究提出使用涂层辅助化学气相合成（CVS），以NaCl或KCl作为涂层剂来抑制团聚。我们发现，通过场发射扫描电子显微镜图像分析，在900℃下用KCl进行飞行中涂层，传统CVS的团聚率为34.40%，在所提出的方法中可降至4.80%。此外，X射线衍射和X射线荧光分析证实，NaCl和KCl涂层剂可以通过用蒸馏水洗涤去除。我们相信，这种涂层工艺可用于抑制Ni NPs的CVS过程中团聚体的形成。
