Synthesis and plasmonic properties of silver and gold nanoshells on polystyrene cores of different size and of gold-silver core-shell nanostructures
Synthesis and plasmonic properties of silver and gold nanoshells on polystyrene cores of different size and of gold-silver core-shell nanostructures
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DOI：
10.1016/j.colsurfa.2006.05.004
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发表时间：
2006-11-15
影响因子：
5.2
通讯作者：
Prasad, Paras N.
中科院分区：
文献类型：
--
作者：
Yong, Ken-Tye;Sahoo, Yudhisthira;Prasad, Paras N.
介绍了在不同尺寸的单分散聚苯乙烯微球表面制备银和金纳米壳以及在自支撑金纳米颗粒上制备银纳米壳的简单方法。这些材料的等离子体共振吸收光谱的扩展米氏散射理论的预测相比。银和金纳米壳生长在直径为188至543 nm的聚苯乙烯微球上。市售的，最初的羧酸盐封端的聚苯乙烯球与2-氨基乙撑二胺盐酸盐（AET）反应，得到硫醇封端的微球，然后连接到金纳米粒子。将银或氢氧化金还原到这些金修饰的微球上导致聚苯乙烯核上银或金的覆盖率增加。采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）和紫外-可见光谱对纳米壳进行了表征。通过改变聚苯乙烯颗粒的核尺寸和还原到其上的金属（银或金）的量，纳米壳的表面等离子体共振可以在电磁波谱的可见光和近红外区域进行调谐。通过将银还原到游离的柠檬酸盐-金纳米粒子上，形成了金核-银壳纳米粒子的项链状链聚集体结构。这些纳米颗粒的等离子体共振吸收也可以在可见光谱范围内进行系统调谐。(c)2006 Elsevier B. V.保留所有权利。
Simple methods of preparing silver and gold nanoshells on the surfaces of monodispersed polystyrene microspheres of different sizes as well as of silver nanoshells on free-standing gold nanoparticles are presented. The plasmon resonance absorption spectra of these materials are presented and compared to predictions of extended Mie scattering theory. Both silver and gold nanoshells were grown on polystyrene microspheres with diameters ranging from 188 to 543 nm. The commercially available, initially carboxylate-terminated polystyrene spheres were reacted with 2-aminoethanethiol hydrochloride (AET) to yield thiol-terminated microspheres to which gold nanoparticles were then attached. Reduction of silver nitrate or gold hydroxide onto these gold-decorated microspheres resulted in increasing coverage of silver or gold on the polystyrene core. The nanoshells were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM) and UV-vis spectroscopy. By varying the core size of the polystyrene particles and the amount of metal (silver or gold) reduced onto them, the surface plasmon resonance of the nanoshell could be tuned across the visible and the near-infrared regions of the electromagnetic spectrum. Necklace-like chain aggregate structures of gold core-silver shell nanoparticles were formed by reducing silver nitrate onto free citrate-gold nanoparticles. The plasmon resonance absorption of these nanoparticles could also be systematically tuned across the visible spectrum. (c) 2006 Elsevier B.V. All rights reserved.