Shape-Dependent Refractive Index Sensitivities of Gold Nanocrystals with the Same Plasmon Resonance Wavelength

被引:131
作者
Chen, Huanjun [1 ]
Shao, Lei [1 ]
Woo, Kat Choi [1 ]
Ming, Tian [1 ]
Lin, Hai-Qing [1 ]
Wang, Jianfang [1 ]
机构
[1] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
NANOSCALE OPTICAL BIOSENSOR; RANGE DISTANCE DEPENDENCE; NOBLE-METAL NANOPARTICLES; SILVER NANOPARTICLES; NANOSPHERE LITHOGRAPHY; DIELECTRIC ENVIRONMENT; ALZHEIMERS-DISEASE; NANORODS; SINGLE; SPECTROSCOPY;
D O I
10.1021/jp907413n
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Gold nanocrystals in seven different shapes were prepared, including large nanorods, nanobipyramids, oxidized nanobipyramids, oxidized nanorods, dog-bone-like nanorods, peanut-like nanorods, and small nanorods. Their longitudinal plasmon resonance wavelengths were all synthetically controlled to be around 730 nm. Their refractive index sensitivities were measured by dispersing them in water-glycerol mixtures of varying compositions. The index sensitivities were found to be dependent on the shapes of the gold nanocrystals, with the large nanorods exhibiting the highest index sensitivity of 326 nm/RIU (refractive index unit) and the small nanorods exhibiting the lowest sensitivity of 156 nm/RIU. Finite-difference time-domain calculations were performed to obtain the electric field intensity enhancement contours around these gold nanocrystals. The index sensitivity was found to exhibit an approximately linear dependence on the product of the nanocrystal polarizability and end curvature.
引用
收藏
页码:17691 / 17697
页数:7
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