High Surface-Enhanced Raman Scattering (SERS) sensitivity of R6G by fabrication of silver nanoparticles over GaN nanowires

Author

Dar, N. ; Wen-Jing, Wang ; Kuo-Hao, Lee ; In-Gann, Chen

Author_Institution

Dept. of Mater. Sci., Nat. Cheng Kung Univ., Tainan, Taiwan

fYear

2011

fDate

15-18 Aug. 2011

Firstpage

297

Lastpage

300

Abstract

A composite structure made of Ag nanoparticles adsorbed on GaN nanowires were used as a Surface-Enhanced Raman Scattering (SERS) substrate. With Rhodamine 6G used as a SERS probe, high enhancement factor of 9*10¹¹ was derived. Detection limit as low as 10^-12M was observed. Intensity of the SERS was correlated to the adsorbing pattern of the Ag nanoparticles. Low Ag coverage corresponded to isolated spherical Ag nanoparticles, which intensify the SERS. High Ag coverage, however, corresponded to larger particles and island growth, which causes low SERS magnification.

Keywords

III-V semiconductors; gallium compounds; island structure; nanoparticles; nanowires; semiconductor quantum wires; silver; surface enhanced Raman scattering; wide band gap semiconductors; Ag; GaN; GaN nanowires; R6G; Rhodamine 6G; SERS probe; SERS substrate; composite structure; island growth; spherical Ag nanoparticles; surface-enhanced Raman scattering; Gallium nitride; Nanoparticles; Raman scattering; Silicon; Silver; Substrates; Surface treatment; Rhodamine 6G; SERS; detection limit; enhancement factor; silver nanoparticles;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology (IEEE-NANO), 2011 11th IEEE Conference on

Conference_Location

Portland, OR

ISSN

1944-9399

Print_ISBN

978-1-4577-1514-3

Electronic_ISBN

1944-9399

Type

conf

DOI

10.1109/NANO.2011.6144370

Filename

6144370