Fieser David, Lan Yucheng, Gulino Antonino, Compagnini Giuseppe, Aaron Doug, Mench Matthew, Bridges Denzel, Shortt Hugh, Liaw Peter, Hu Anming
Department of Mechanical, Aerospace, Biomedical Engineering, The University of Tennessee, Knoxville, 1512 Middle Drive, Knoxville, TN 37996, USA.
Department of Physics and Engineering, Morgan State University, 1700 East Cold Spring Lane, Baltimore, MD 21251, USA.
Nanomaterials (Basel). 2024 Mar 21;14(6):554. doi: 10.3390/nano14060554.
High-entropy alloys (HEAs) are a class of metal alloys consisting of four or more molar equal or near-equal elements. HEA nanomaterials have garnered significant interest due to their wide range of applications, such as electrocatalysis, welding, and brazing. Their unique multi-principle high-entropy effect allows for the tailoring of the alloy composition to facilitate specific electrochemical reactions. This study focuses on the synthesis of high-purity HEA nanoparticles using the method of femtosecond laser ablation synthesis in liquid. The use of ultrashort energy pulses in femtosecond lasers enables uniform ablation of materials at significantly lower power levels compared to longer pulse or continuous pulse lasers. We investigate how various femtosecond laser parameters affect the morphology, phase, and other characteristics of the synthesized nanoparticles. An innovative aspect of our solution is its ability to rapidly generate multi-component nanoparticles with a high fidelity as the input multi-component target material at a significant yielding rate. Our research thus focuses on a novel synthesis of high-entropy alloying CuCoMnNiFe nanoparticles. We explore the characterization and unique properties of the nanoparticles and consider their electrocatalytic applications, including high power density aluminum air batteries, as well as their efficacy in the oxygen reduction reaction (ORR). Additionally, we report a unique nanowire fabrication phenomenon achieved through nanojoining. The findings from this study shed light on the potential of femtosecond laser ablation synthesis in liquid (FLASiL) as a promising technique for producing high-purity HEA nanoparticles.
高熵合金（HEAs）是一类由四种或更多摩尔比相等或接近相等的元素组成的金属合金。高熵合金纳米材料因其广泛的应用，如电催化、焊接和钎焊，而备受关注。它们独特的多主元高熵效应使得可以对合金成分进行定制，以促进特定的电化学反应。本研究聚焦于使用飞秒激光液相烧蚀合成法制备高纯度的高熵合金纳米颗粒。与长脉冲或连续脉冲激光相比，飞秒激光中使用的超短能量脉冲能够在显著更低的功率水平下实现材料的均匀烧蚀。我们研究了各种飞秒激光参数如何影响合成纳米颗粒的形态、相和其他特性。我们解决方案的一个创新之处在于，它能够以高保真度快速生成多组分纳米颗粒，作为输入的多组分靶材，产率显著。因此，我们的研究聚焦于高熵合金化的CuCoMnNiFe纳米颗粒的新型合成。我们探索了纳米颗粒的表征和独特性能，并考虑了它们在电催化方面的应用，包括高功率密度铝空气电池，以及它们在氧还原反应（ORR）中的效能。此外，我们报告了通过纳米连接实现的一种独特的纳米线制造现象。这项研究的结果揭示了飞秒激光液相烧蚀合成法（FLASiL）作为一种生产高纯度高熵合金纳米颗粒的有前景技术的潜力。
