Anisotropically phase-segregated Pd-Co-Pd sulfide nanoparticles formed by fusing two Co-Pd sulfide nanoparticles.
Anisotropically phase-segregated Pd-Co-Pd sulfide nanoparticles formed by fusing two Co-Pd sulfide nanoparticles.
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DOI：
10.1002/anie.200603865
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发表时间：
2007-02
影响因子：
--
通讯作者：
T. Teranishi;M. Saruyama;M. Nakaya;M. Kanehara
中科院分区：
文献类型：
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作者：
T. Teranishi;M. Saruyama;M. Nakaya;M. Kanehara
由于无机纳米粒子的主要结构（如尺寸和形状）决定了其物理和化学性质，因此对这些结构的控制是阐明结构依赖性质和直接组装层次结构的先决条件。[1-8]当一个纳米粒子由两种不同的化学物质组成时，化学物质的分布就成为决定其性质和功能的另一个因素。[9-11]总的来说，这种化学合成为我们提供了化学无序的合金或核壳结构，其中两种不同的化学物质各向同性地分布。近年来，各向异性相分离纳米颗粒由于其两个重要特征而变得容易获得并受到广泛关注。首先，人们可以同时利用两种不同的功能，如发光和磁性。其次，两种不同的功能配体可以各向异性地排列在这些粒子的表面，从而导致微观和纳米结构的定向组装。这些材料可以是等离子体金属和半导体，等离子体金属和磁性氧化物，或其他组合。[12-19]其中，不同金属硫族化物纳米粒子的组合在生物标记、发光二极管等方面具有很大的应用潜力最近，我们成功地自发形成了各向异性相分离的Co-Pd硫化橡子状纳米粒子（“纳米橡子”）本文报道了一种基于PdSx种子介导生长的新型Pd-Co-Pd硫化异质结构纳米颗粒的合成和表征，并证明了这种方法有可能产生各种各向异性相分离的异质结构。基于我们提出的Co-Pd硫化“纳米橡子”的形成机制，其中Co9S8相从预制的PdSx纳米颗粒中各向异性生长，PdSx纳米颗粒是形成异质结构的关键材料据此，PdSx种子介导的各向异性相序合成
As the primary structures of inorganic nanoparticles, such as size and shape, determine their physical and chemical properties, the control of such structures is prerequisite for both the elucidation of structure-dependent properties and the direct assembly of hierarchical structures.[1–8] When a nanoparticle consists of two distinct chemical species, the distribution of chemical species becomes another determinant for its properties and functions.[9–11] In general, this chemical synthesis provides us with chemically disordered alloys or core–shell structures, in which two distinct chemical species isotropically distribute. Recently, anisotropically phase-segregated nanoparticles have become accessible and received much attention as a result of two important features. First, one can simultaneously utilize two different functions such as luminescence and magnetic properties. Second, two distinct functional ligands can be anisotropically arranged at the surface of these particles, thus leading to a directed assembly of micro-and nanostructures. These materials could either be a plasmonic metal and a semiconductor, a plasmonic metal and a magnetic oxide, or other combinations.[12–19] Among them, a combination of distinct metal chalcogenide nanoparticles would have great potential for various applications, including biological labeling, light-emitting diodes, and so on.[18] Recently, we succeeded in the spontaneous formation of anisotropically phase-segregated Co–Pd sulfide acornshaped nanoparticles (“nanoacorns”).[20] Here we report the synthesis and characterization of a new type of Pd–Co–Pd sulfide heterostructured nanoparticle based on PdSx seedmediated growth and demonstrate that this method has a potential to yield various anisotropically phase-segregated heterostructures.On the basis of our proposed mechanism for the formation of Co–Pd sulfide “nanoacorns”, in which the Co9S8 phases anisotropically grow from preformed PdSx nanoparticles, the PdSx nanoparticles are the key material for the formation of heterostructures.[20] Accordingly, the PdSx seed-mediated synthesis of anisotropically phase-segre-