Controlled fabrication of nanopillar arrays as active substrates for surface-enhanced Raman spectroscopy.
Highly ordered gold nanopillar arrays were fabricated using anodized aluminum oxide (AAO) templates. Nanopillars with a dimension of 110 +/- 15 nm in vertical height and 75 +/- 10 nm in base diameter were formed with a density of 150 microm(-2). The ordered nanopillar arrays give reproducible surface-enhanced Raman scattering (SERS) at a detection limit of 10(-8) M using thionine as probing molecules. The enhancement by the Au nanopillar arrays was comparable with or better than that of dispersed gold nanoparticle SERS substrates. This work demonstrates a new technique for producing highly ordered and reproducible SERS substrates potentially applicable for chemical and biological assay.
Ruan
Chuanmin
C
Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831, USA.
Eres
Gyula
G
Wang
Wei
W
Zhang
Zhenyu
Z
Gu
Baohua
B
D000537:Aluminum Oxide / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013499:Surface Properties
D006046:Gold; D000537:Aluminum Oxide