Quantifying the durability of transition metal nitrides in thermoplasmonics at the single-nanoparticle level
Quantifying the durability of transition metal nitrides in thermoplasmonics at the single-nanoparticle level
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DOI：
10.1063/5.0074139
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发表时间：
2021-11-01
期刊：
影响因子：
1.6
通讯作者：
Ito, Syoji
中科院分区：
文献类型：
--
作者：
Setoura, Kenji;Ito, Syoji
光照射下等离激元纳米粒子产生的热量作为化学反应和材料加工的纳米级来源具有重要用途；热等离激元学一词已经渗透到纳米技术相关的研究领域，它代表了等离激元学中的光热效应。近年来，过渡金属氮化物作为热等离子体材料因其与贵金属相比优异的热性能而备受关注。氮化钛（TiN）、氮化锆（ZrN）等过渡金属氮化物表现出与金相似的光学性质，且熔点非常高；例如，金和 ZrN 的熔点分别为 1337 K 和 3253 K。然而，已知纳米材料的熔化温度低于整体熔点（例如，金纳米颗粒的熔化温度约为 580 K）；这种现象称为表面熔化、预熔化、表面扩散或光热重塑。在目前的工作中，我们通过单纳米粒子水平的散射显微光谱法评估了激光诱导 ZrN 纳米立方体光热重塑的阈值温度。结果，光热重塑的阈值温度范围为1400至2100 K；这些温度比金纳米颗粒的温度高得多。这项工作证明，与贵金属相比，过渡金属氮化物适合在更高温度下进行热等离子体。 (C) 2021 作者
Heat generation of plasmonic nanoparticles under photo-illumination is of great use as nanoscale sources for chemical reactions and materials processing; the term thermoplasmonics has been infiltrating in the research fields related to nanotechnology, which represents photothermal effects in plasmonics. In recent years, transition metal nitrides have attracted much attention as thermoplasmonic materials because of their excellent thermal properties compared with those of noble metals. The transition metal nitrides such as titanium nitride (TiN) and zirconium nitride (ZrN) exhibit optical properties similar to gold, and their melting points are very high; for instance, the melting points are 1337 and 3253 K for gold and ZrN, respectively. However, nanometer-sized materials are known to melt at lower temperatures compared with bulk melting points (e.g., around 580 K for gold nanoparticles); this phenomenon is called surface melting, premelting, surface diffusion, or photothermal reshaping. In the present work, we evaluated threshold temperatures of the laser-induced photothermal reshaping of ZrN nanocubes by the scattering micro-spectroscopy at the single-nanoparticle level. As a result, the threshold temperatures of the photothermal reshaping ranged from 1400 to 2100 K; these temperatures are much higher than that of the gold nanoparticles. This work proved that the transition metal nitrides are suitable for thermoplasmonics at higher temperatures compared to the noble metals. (C) 2021 Author(s)