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金纳米碗亚单层结构的制备、表征及光学性质

Fabrication, characterization, and optical properties of gold nanobowl submonolayer structures.

作者信息

Ye Jian, Van Dorpe Pol, Van Roy Willem, Borghs Gustaaf, Maes Guido

机构信息

IMEC, Kapeldreef 75, Leuven, B-3001, Belgium, and Chemistry Department, Katholieke Universiteit Leuven, Leuven, B-3001, Belgium.

出版信息

Langmuir. 2009 Feb 3;25(3):1822-7. doi: 10.1021/la803768y.

Abstract

We report on a versatile method to fabricate hollow gold nanobowls and complex gold nanobowls (with a core) based on an ion milling and a vapor HF etching technique. Two different sized hollow gold nanobowls are fabricated by milling and etching submonolayers of gold nanoshells deposited on a substrate, and their sizes and morphologies are characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Optical properties of hollow gold nanobowls with different sizes are investigated experimentally and theoretically, showing highly tunable plasmon resonance ranging from the visible to the near-infrared region. Additionally, finite difference time domain (FDTD) calculations show an enhanced localized electromagnetic field around hollow gold nanobowl structures, which indicates a potential application in surface-enhanced Raman scattering (SERS) spectroscopy for biomolecular detection. Finally, we demonstrate the fabrication of complex gold nanobowls with a gold nanoparticle core which offers the capability to create plasmon hybridized nanostructures.

摘要

我们报道了一种基于离子铣削和蒸汽HF蚀刻技术制备中空金纳米碗和复合金纳米碗(有一个核心)的通用方法。通过对沉积在衬底上的金纳米壳亚单层进行铣削和蚀刻,制备了两种不同尺寸的中空金纳米碗,并用扫描电子显微镜(SEM)和原子力显微镜(AFM)对其尺寸和形态进行了表征。对不同尺寸的中空金纳米碗的光学性质进行了实验和理论研究,结果表明其等离子体共振在可见光到近红外区域具有高度可调性。此外,时域有限差分(FDTD)计算表明,中空金纳米碗结构周围的局部电磁场增强,这表明其在用于生物分子检测的表面增强拉曼散射(SERS)光谱学中有潜在应用。最后,我们展示了具有金纳米颗粒核心的复合金纳米碗的制备,这种复合金纳米碗能够创建等离子体杂交纳米结构。

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