Title :
A highly-ordered three-dimensional petal-like arrayed structure for highly surface-enhanced Raman scattering
Author :
Qian, C. ; Ni, C. ; Zhang, Y.L. ; Zhou, Y. ; Wu, W.G. ; Xu, J. ; Hao, Y.L.
Author_Institution :
Nat. Key Lab. of Sci. & Technol. on Micro/Nano Fabrication, Peking Univ., Beijing, China
Abstract :
This paper reports for the first time a novel highly-ordered three-dimensional (3D) petal-like arrayed structure (PLAS) which can serve as an ideal substrate for surface-enhanced Raman scattering (SERS). The structure is achieved by anisotropically etching a hexagonal close-packed silica nanoparticle (SNP) bilayer coated on a silicon substrate through evaporation-induced self-assembly, and then depositing a silver film. SERS experiments with excitation wavelength at 632.8 nm show that the SERS enhancement factor of the PLAS is 8 times higher than that of monolayer SNP arrays, and longer etching time, which changes the shape and interspace, thus hot spots of the structure, can achieve higher SERS enhancement factor.
Keywords :
nanoparticles; surface enhanced Raman scattering; anisotropic etching; evaporation-induced self-assembly; hexagonal close-packed silica nanoparticle; highly surface-enhanced Raman scattering; highly-ordered three-dimensional petal-like arrayed structure; monolayer SNP arrays; silicon substrate; Anisotropic magnetoresistance; Etching; Programmable logic arrays; Raman scattering; Self-assembly; Semiconductor films; Shape; Silicon compounds; Silver; Substrates;
Conference_Titel :
Micro Electro Mechanical Systems (MEMS), 2010 IEEE 23rd International Conference on
Conference_Location :
Wanchai, Hong Kong
Print_ISBN :
978-1-4244-5761-8
Electronic_ISBN :
1084-6999
DOI :
10.1109/MEMSYS.2010.5442346
