Shape and size dependence of the surface plasmon resonance of gold nanoparticles studied by Photoacoustic technique

被引：225

作者：

El-Brolossy, T. A. ^{[1
]}

Abdallah, T. ^{[1
]}

Mohamed, M. B. ^{[3
]}

Abdallah, S. ^{[2
]}

Easawi, K. ^{[2
]}

Negm, S. ^{[2
]}

Talaat, H. ^{[1
]}

机构：

[1] Ain Shams Univ, Dept Phys, Fac Sci, Abbsssia Cairo, Egypt

[2] Zagazig Univ Shoubra, Dept Math & Phys, Fac Engn, Cairo, Egypt

[3] Cairo Univ, NILES, Giza, Egypt

来源：

EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS | 2008年 / 153卷 / 1期

关键词：

Surface Plasmon Resonance; Gold Nanoparticles; European Physical Journal Special Topic; Scanning Tunnelling Microscope; Gold Nanorods;

D O I：

10.1140/epjst/e2008-00462-0

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the optical absorption properties of as prepared gold naoparticles of different shapes and sizes measured by photoacoustic (PA) method. The gold nanoparticles of two different shapes (dots, rods) have been prepared using the seed mediated growth method. The shape and the size of these different nanoparticles were determined by STM measurements. PA spectra show the splitting of the surface plasmon resonance (SPR) into two modes (transverse and longitudinal) in case of gold nanorods. The increase in the aspect ratio of the nanorods leads to clear redshifts of the longitudinal SPR. These shifts were used to determine the dielectric constant of the surrounding medium and its variation with the aspect ratios.

引用

页码：361 / 364

页数：4

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