TY - GEN
T1 - Iridium nanopillars with multilayered, uniformly distributed hot spots for highly reproducible surface-enhanced Raman scattering
AU - Li, Peng
AU - Kang, Guoguo
AU - Meng, Xiandong
AU - Tan, Xiaodi
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015
Y1 - 2015
N2 - The detection of ultralow levels of species with the surface-enhanced Raman scattering (SERS)-based sensors has been hindered by difficulties in realizing SERS substrates that provide uniform, reproducible SERS response over the active area. Here we report on the periodic arrays of high aspect-ratio iridium nanopillars that feature rich and evenly distributed plasmonic hot spots within the pillars. Working as the SERS substrate, we demonstrate that the ordered and well defined plasmonic nanopillars offer the variability less than 5% (relative standard deviation), in SERS response over the patterned area. By using iridium atomic layer deposition to overcoat high aspect-ratio SiO2 nanopillars, the width of interpillar gaps goes down to 10 nm, leading to an order of magnitude increase in the SERS response in comparison to conventional SERS substrates. The smallest variability in SERS response that has ever been obtained, together with the large enhancement factor, suggest the structure an ideal SERS-based sensor for species with low concentrations, paving the way for single-molecule detection.
AB - The detection of ultralow levels of species with the surface-enhanced Raman scattering (SERS)-based sensors has been hindered by difficulties in realizing SERS substrates that provide uniform, reproducible SERS response over the active area. Here we report on the periodic arrays of high aspect-ratio iridium nanopillars that feature rich and evenly distributed plasmonic hot spots within the pillars. Working as the SERS substrate, we demonstrate that the ordered and well defined plasmonic nanopillars offer the variability less than 5% (relative standard deviation), in SERS response over the patterned area. By using iridium atomic layer deposition to overcoat high aspect-ratio SiO2 nanopillars, the width of interpillar gaps goes down to 10 nm, leading to an order of magnitude increase in the SERS response in comparison to conventional SERS substrates. The smallest variability in SERS response that has ever been obtained, together with the large enhancement factor, suggest the structure an ideal SERS-based sensor for species with low concentrations, paving the way for single-molecule detection.
KW - Atomic layer deposition (ALD)
KW - Biosensor
KW - Localized surface plasmons (LSPs)
KW - Nanogap
KW - Plasmonic nanopillars
KW - Surface-enhanced Raman scattering (SERS)
UR - http://www.scopus.com/inward/record.url?scp=84964336344&partnerID=8YFLogxK
U2 - 10.1109/NANO.2015.7388689
DO - 10.1109/NANO.2015.7388689
M3 - Conference contribution
AN - SCOPUS:84964336344
T3 - IEEE-NANO 2015 - 15th International Conference on Nanotechnology
SP - 649
EP - 653
BT - IEEE-NANO 2015 - 15th International Conference on Nanotechnology
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 15th IEEE International Conference on Nanotechnology, IEEE-NANO 2015
Y2 - 27 July 2015 through 30 July 2015
ER -