Current synthetic approaches to metal nanoparticles are mostly batch processes that use a large quantity of reagents and surfactants, producing enormous amount of solid and liquid waste. Here, we developed a rotating electrodeposition and separation (REDS) technique, which entails electrochemically depositing nanoparticles onto a continuously rotating metal foil and subsequently harvesting them through mechanical delamination. A wide array of elemental nanoparticles (e.g., Ag, Au, Ni, Cu), alloys nanoparticles (e.g., FeCoNi and FeCoNiW), and metal oxide nanomaterials (e.g., Co₃O₄) were synthesized by REDS. We further controlled the growth direction of metals during the electrodeposition to fabricate more complex structures such as polyhedrons, nanoplates, dendrites, and flower nanostructures. Based on the metallic nanoparticles, we obtained conducting inks and fabricated near-field communication tags and touch screen panels. Our technique provides a novel approach for rapid, scalable, and green preparation of low-cost and high-quality nanoparticles in which electrodeposition chemistry can be controlled with a roll-to-roll system.

当前对金属纳米颗粒的合成方法大部分是使用大量试剂和表面活性剂的间歇过程，产生大量的固体和液体废物。在这里，我们开发了一种旋转电沉积和分离（REDS）技术，该技术需要将纳米颗粒电化学沉积到连续旋转的金属箔上，然后通过机械分层收集它们。各种各样的元素纳米颗粒（例如，Ag，Au，Ni，Cu），合金纳米颗粒（例如，FeCoNi和FeCoNiW）以及金属氧化物纳米材料（例如，Co ₃ O ₄）由REDS合成。我们进一步控制了电沉积过程中金属的生长方向，以制造更复杂的结构，例如多面体，纳米板，树枝状晶体和花朵纳米结构。基于金属纳米颗粒，我们获得了导电油墨，并制造了近场通信标签和触摸屏面板。我们的技术为低成本，高质量纳米颗粒的快速，可扩展和绿色制备提供了一种新颖的方法，其中可以通过卷对卷系统控制电沉积化学。