TY - JOUR
T1 - Novel irregular pore peripheral plasmonic mechanism of nanocomposite metal-nanoporous AAO using new facile one-step anodization and pore widening for high SERS enhancement
AU - Yu, C. Y.
AU - Chung, C. K.
N1 - Funding Information:
This work is partially sponsored by the Ministry of Science and Technology (MOST), Taiwan , under contract No MOST109-2221-E-006-006 and 110-2221-E-006-177 . We also would like to thank the Core Facility Center in National Cheng Kung University for some equipment support.
Funding Information:
This work is partially sponsored by the Ministry of Science and Technology (MOST), Taiwan, under contract No MOST109-2221-E-006-006 and 110-2221-E-006-177. We also would like to thank the Core Facility Center in National Cheng Kung University for some equipment support.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - Conventional surface-enhanced Raman scattering (SERS) substrates are usually performed by Ag-or-Au metal nanoparticles (Ag,Au-MNPs) in suspension-or-solid substrates. The SERS mechanism is widely explained by the hot spots and shape of Ag,Au-MNPs. Here, the facile one-step irregular-nanopore anodic aluminum oxide (AAO) with platinum-metal-film (Pt-MF) coating as the new SERS substrate is proposed. A novel SERS mechanism based on the irregular Pore Peripheral Plasmonic Mechanism (3PM) of MF-AAO is interpreted. COMSOL® simulation shows the pore peripheral of AAO may gather a strong electric field for enhancing Raman signal. The irregular pores formed in the as-prepared one-step AAO and followed by pore-widening etching can generate additional hot spots at the small interpore gap and high-curvature tips for further enhancing SERS analytical enhancement factor (AEF). Using methylene blue (MB) as a probe molecule that was generally used to practically detect industry-pollution S2- and to sanitize water for fish health, the Pt-MF-AAO SERS substrate can reach a high AEF up to 1.88 × 105, and low limit of detection (LOD) of 1 × 10−9 M. A good linearity (R2 of 0.9406) between the MB concentration and Raman intensity is achieved. The large-area (several cm2) uniformity of is good with relative standard deviation (RSD) of 7.14%.
AB - Conventional surface-enhanced Raman scattering (SERS) substrates are usually performed by Ag-or-Au metal nanoparticles (Ag,Au-MNPs) in suspension-or-solid substrates. The SERS mechanism is widely explained by the hot spots and shape of Ag,Au-MNPs. Here, the facile one-step irregular-nanopore anodic aluminum oxide (AAO) with platinum-metal-film (Pt-MF) coating as the new SERS substrate is proposed. A novel SERS mechanism based on the irregular Pore Peripheral Plasmonic Mechanism (3PM) of MF-AAO is interpreted. COMSOL® simulation shows the pore peripheral of AAO may gather a strong electric field for enhancing Raman signal. The irregular pores formed in the as-prepared one-step AAO and followed by pore-widening etching can generate additional hot spots at the small interpore gap and high-curvature tips for further enhancing SERS analytical enhancement factor (AEF). Using methylene blue (MB) as a probe molecule that was generally used to practically detect industry-pollution S2- and to sanitize water for fish health, the Pt-MF-AAO SERS substrate can reach a high AEF up to 1.88 × 105, and low limit of detection (LOD) of 1 × 10−9 M. A good linearity (R2 of 0.9406) between the MB concentration and Raman intensity is achieved. The large-area (several cm2) uniformity of is good with relative standard deviation (RSD) of 7.14%.
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U2 - 10.1016/j.apsusc.2021.152252
DO - 10.1016/j.apsusc.2021.152252
M3 - Article
AN - SCOPUS:85122088213
SN - 0169-4332
VL - 580
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 152252
ER -