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Plasmonic properties of gold-palladium core–shell nanorods

Kitsakorn Locharoenrat and Pattareeya Damrongsak

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Abstract. We focus on the plasmonic properties of palladium-coated gold nanorods. Two characteristic plasmon bands of those nanorods have been detected in the optical absorption. One of them, which is located at about 525 nm, is associated with electron oscillations along the transverse direction. This band does not depend on the palladium-shell thickness and the dielectric susceptibility of the surrounding medium. The other band, at about 800–900 nm, is associated with electron oscillations along the longitudinal direction. It exhibits a clear shift when the palladium-shell thickness and the dielectric surrounding are changed. Our results point to a novel possible way for tuning photo-catalytic ability of the nanorods and their possible use in biological/chemical sensors.

Keywords: metals, plasmons, nanomaterials, nanorods

PACS: 73.20.Mf, 78.67.Qa, 81.10.Dn
UDC: 535.34+535.331
Ukr. J. Phys. Opt. 16 120-126
doi: 10.3116/16091833/16/3/120/2015
Received: 23.04.2015

Анотація. У роботі досліджено плазмонні властивості золотих наностержнів, покритих паладієм. У спектрах їхнього оптичного поглинання виявлено дві характерні плазмонні смуги. Одна з них, розташована в околі 525 нм, пов’язана з електронними коливаннями вздовж поперечного напрямку стержнів. Її положення не залежить од товщини паладієвої оболонки та діелектричної сталої оточуючого середовища. Інша, розташована в околі 800–900 нм, асоціюється з електронними коливаннями в поздовжньому напрямку. Вона зазнає зсуву зі зміною товщини паладієвої оболонки і показника заломлення оточуючого середовища. Наші дослідження вказують на новий можливий шлях керування фотокаталітичною здатністю наностержнів і перспективи їхнього використання в біолого-хімічних сенсорах. 
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