Classes of Nanomagnets Created from Alkanethiol-Coated Pt or Pd Nanoparticles and Their Alloys with Co
Classes of Nanomagnets Created from Alkanethiol-Coated Pt or Pd Nanoparticles and Their Alloys with Co
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DOI：
10.1002/ejic.201000483
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发表时间：
2010-09
影响因子：
2.3
通讯作者：
A. Miyazaki;Yoshikazu Ito;T. Enoki
中科院分区：
文献类型：
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作者：
A. Miyazaki;Yoshikazu Ito;T. Enoki
烷硫醇涂覆的金属纳米颗粒是用于设计非常规电子和磁性功能的令人着迷的材料。使用 Pd 和 Pt 纳米颗粒及其与 3d 过渡金属的合金，利用量子尺寸、界面和交换增强效应，可以创建新型磁性纳米系统。金属-有机界面上的电荷转移和量子尺寸效应使 Pt 和 Pd 纳米粒子具有局域矩的磁性。用具有长烷硫醇取代基的TTF衍生物取代封端分子会由于TTF单元的部分氧化而降低总自旋浓度。含有Co原子作为磁中心的Pd纳米颗粒由于交换增强而显着增强了磁矩。有趣的是，在直径为 2 nm 的 Pd 纳米颗粒中，每个颗粒仅包含一个 Co 原子，Co 原子会磁化颗粒中的所有 Pd 原子。因此，纳米颗粒表现为表现出阻塞行为的单个纳米颗粒磁体。
Alkanethiol-coated metal nanoparticles are fascinating materials for designing unconventional electronic and magnetic functions. Novel classes of magnetic nanosystems can be created using Pd and Pt nanoparticles and their alloys with a 3d transition metal using quantum size, interface and exchange enhancement effects. The charge transfer at the metal-organic interface and the quantum size effect render Pt and Pd nanoparticles magnetic with localised moments. The substitution of capping molecules with a TTF derivative having a long alkanethiol substituent decreases the totalspin concentration due to partial oxidation of the TTF units. Pd nanoparticles containing Co atoms as magnetic centres have significantly enhanced magnetic moments because of the exchange enhancement. Interestingly, in Pd nanoparticles of 2 nm in diameter containing only one Co atom per particle, the Co atom magnetises all of the Pd atoms in the particle. Therefore, the nanoparticles behave as a single nanoparticle magnet that shows blocking behaviour.