Creation of Multi‐Principal Element Alloy NiCoCr Nanostructures via Nanosecond Laser‐Induced Dewetting
Creation of Multi‐Principal Element Alloy NiCoCr Nanostructures via Nanosecond Laser‐Induced Dewetting
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通过纳秒激光诱导去湿创建多主元合金 NiCoCr 纳米结构
DOI：
10.1002/smll.202309574
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发表时间：
2024
期刊：
影响因子：
13.3
通讯作者：
Sachan, Ritesh
中科院分区：
文献类型：
--
作者：
Mandal, Soumya;Gupta, Ashish Kumar;Konečná, Andrea;Shirato, Nozomi;Hachtel, Jordan A.;Sachan, Ritesh
多主元素合金纳米颗粒（MPEA NPs）是一类新的纳米材料，由于其独特的原子级均匀混合纳米结构中的组成元素的特性，为探索新的或与传统的单/双/多金属纳米结构截然不同的功能特性提供了非常有价值的机会。在这里，成功地创建NiCoCr纳米粒子，一个众所周知的MPEA系统的报告，使用超快纳秒激光诱导的合金薄膜去湿。纳米颗粒的形成是通过在激光诱导的流体动力学不稳定性下自发地破坏处于熔融状态的能量不稳定的薄膜，随后通过表面能最小化以液滴形状积累而发生的。虽然NiCoCr合金与单独的金属成分相比在物理性质上显示出鲜明的对比，即，Ni、Co和Cr，但激光驱动过程的瞬态性质有助于成分（Ni、Co和Cr）在纳米颗粒中的均匀分布。使用高分辨率化学分析和扫描纳米衍射，进一步研究了纳米颗粒的环境稳定性和颗粒排列。热输运模拟表明，在去湿过程中，NiCoCr的超短（约100 ns）熔体寿命有助于将组成元素保持在单相固溶体中，均匀分布，并打开了利用激光诱导去湿过程产生独特MPEA纳米颗粒的途径。
The multi‐principal element alloy nanoparticles (MPEA NPs), a new class of nanomaterials, present a highly rewarding opportunity to explore new or vastly different functional properties than the traditional mono/bi/multimetallic nanostructures due to their unique characteristics of atomic‐level homogeneous mixing of constituent elements in the nanoconfinements. Here, the successful creation of NiCoCr nanoparticles, a well‐known MPEA system is reported, using ultrafast nanosecond laser‐induced dewetting of alloy thin films. Nanoparticle formation occurs by spontaneously breaking the energetically unstable thin films in a melt state under laser‐induced hydrodynamic instability and subsequently accumulating in a droplet shape via surface energy minimization. While NiCoCr alloy shows a stark contrast in physical properties compared to individual metallic constituents, i.e., Ni, Co, and Cr, yet the transient nature of the laser‐driven process facilitates a homogeneous distribution of the constituents (Ni, Co, and Cr) in the nanoparticles. Using high‐resolution chemical analysis and scanning nanodiffraction, the environmental stability and grain arrangement in the nanoparticles are further investigated. Thermal transport simulations reveal that the ultrashort (≈100 ns) melt‐state lifetime of NiCoCr during the dewetting event helps retain the constituent elements in a single‐phase solid solution with homogenous distribution and opens the pathway to create the unique MPEA nanoparticles with laser‐induced dewetting process.