高强度激光场激光诱导成核合成贵金属及其合金纳米颗粒

IF 2.6 4区 材料科学 Q3 ENGINEERING, CHEMICAL
Takahiro Nakamura, Yuki Yamazaki, S. Sato
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引用次数: 3

摘要

介绍了激光诱导成核法制备贵金属及其合金纳米颗粒的方法。能量在mJ量级的飞秒激光脉冲在贵金属离子水溶液中被紧密聚焦,产生了10 14 W/ cm2或更高的强度。强烈的激光场产生具有高度还原能力的溶剂化电子和氢自由基,使贵金属离子还原成核,使颗粒成熟生长。这种激光诱导成核方法无需任何还原剂即可进行。氯金酸溶液的过量辐照导致了金纳米颗粒在没有任何表面活性剂的情况下形成稳定的胶体溶液。此外,不同贵金属离子的混合溶液的辐照形成固溶合金纳米颗粒,即使这些金属在体中是不混溶的。此外,激光诱导成核使贵金属五元固溶合金纳米颗粒的形成成为可能。从元素分布的角度讨论了铑钯铂固溶体纳米颗粒对合金纳米颗粒具有优异催化活性的机理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synthesis of Noble Metals and Their Alloy Nanoparticles by Laser-induced Nucleation in a Highly Intense Laser Field
The synthesis of noble metals and their alloy nanoparticles by laser-induced nucleation is described. Femtosecond laser pulses with an energy on the order of mJ were tightly focused to create an intensity of 10 14 W/cm 2 or more in an aqueous solution of noble metal ions. The intense laser field generated solvated electrons and hydrogen radicals that have a highly reducing ability, resulting in nucleation through the reduction of the noble metal ions and particle growth through ripening. This laser-induced nucleation method can be performed without any reducing agents. Excess irradiation of chloroauric acid solution led to the formation of a stable colloidal solution of gold nanoparticles without any surfactants. Additionally, the irradiation of a mixed solution of different noble metal ions formed solid–solution alloy nanoparticles, even though these metals were immiscible in the bulk. Moreover, the laser-induced nucleation made it possible to form quinary solid-solution alloy nanoparticles of noble metals. The mechanism of superior catalytic activity found for alloy nanoparticles by using Rh–Pd–Pt solid–solution nanoparticles is discussed in terms of elemental distributions inside the particles.
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来源期刊
KONA Powder and Particle Journal
KONA Powder and Particle Journal 工程技术-材料科学:综合
CiteScore
8.40
自引率
4.90%
发文量
35
审稿时长
>12 weeks
期刊介绍: KONA publishes papers in the broad field of powder science and technology, ranging from fundamental principles to practical applications. Papers describing technological experience and critical reviews of existing knowledge in special areas are also welcome.
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