Size- and Shape-Controlled Synthesis and Properties of Magnetic-Plasmonic Core-Shell Nanoparticles.
Size- and Shape-Controlled Synthesis and Properties of Magnetic-Plasmonic Core-Shell Nanoparticles.
复制标题
磁性质量核心纳米颗粒的尺寸和形状控制的合成和特性。
DOI：
10.1021/acs.jpcc.6b00875
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发表时间：
2016-05-19
期刊：
影响因子：
--
通讯作者：
Huang X
中科院分区：
文献类型：
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作者：
Kwizera EA;Chaffin E;Shen X;Chen J;Zou Q;Wu Z;Gai Z;Bhana S;O'Connor R;Wang L;Adhikari H;Mishra SR;Wang Y;Huang X
磁等离子体核壳纳米材料在科学、工程和生物医学学科中提供了广泛的应用。然而，合成和理解具有可调尺寸和形状的磁等离子体核壳纳米颗粒的能力仍然非常有限。本文报道了三种不同形状（球形、爆米花形和星星形）的氧化铁-金核壳纳米粒子的合成和性质的实验和计算研究，这些纳米粒子具有可控的尺寸（70 ~ 250 nm）。通过种子介导的生长方法合成纳米粒子，其中新形成的金原子被添加到金种子氧化铁八面体上以形成金壳。通过控制生长溶液中添加剂（银银）和还原剂（抗坏血酸）的量，发现在金种子聚结后，壳层演变成不同的形状。第一性原理计算结合实验结果，阐明了热力学和动力学参数在形状控制合成中的密切作用。离散偶极近似计算和实验结果表明，与纳米球相比，纳米爆米花和纳米星表现出红移等离子体共振，纳米星具有多光谱特征.这一研究在操纵和理解磁等离子体杂化纳米结构方面迈出了重要的一步，并将在许多领域产生重要影响。
Magnetic-plasmonic core-shell nanomaterials offer a wide range of applications across science, engineering and biomedical disciplines. However, the ability to synthesize and understand magnetic-plasmonic core-shell nanoparticles with tunable sizes and shapes remains very limited. This work reports experimental and computational studies on the synthesis and properties of iron oxide-gold core-shell nanoparticles of three different shapes (sphere, popcorn and star) with controllable sizes (70 to 250 nm). The nanoparticles were synthesized via a seed-mediated growth method in which newly formed gold atoms were added onto gold-seeded iron oxide octahedrons to form gold shell. The evolution of the shell into different shapes was found to occur after the coalescence of gold seeds, which was achieved by controlling the amount of additive (silver nitrate) and reducing agent (ascorbic acid) in the growth solution. First principles calculation, together with experimental results, elucidated the intimate roles of thermodynamic and kinetic parameters in the shape-controlled synthesis. Both discrete dipole approximation calculation and experimental results showed that the nanopopcorns and nanostars exhibited red-shifted plasmon resonance compared with the nanospheres, with the nanostars giving multispectral feature. This research has made a great step further in manipulating and understanding magnetic-plasmonic hybrid nanostructures and will make important impact in many different fields.