Controlled Fabrication of Nanopillar Arrays as Active Substrates for Surface-Enhanced Raman Spectroscopy

Ruan, Chuanmin; Eres, Gyula; Wang, Wei; Zhang, Zhenyu; Gu, Baohua

doi:10.1021/la0636356

Cited by 99 publications

(84 citation statements)

References 38 publications

(68 reference statements)

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“…[9][10][11][12][13] On one hand, these periodically arranged nanostructures show excellent surface uniformity, high Raman reproducibility, and the hot spots exist among the nanoscaled units within the substrate zone. [ 14 , 15 ] On the other hand, the neighboring gap between the nanorods can be readily adjusted to several tens of nanometers by thinning the pore walls of the AAO templates in diluted H 3 PO 4 solution.…”

Section: Doi: 101002/adma201001179mentioning

confidence: 99%

Improved SERS Performance from Au Nanopillar Arrays by Abridging the Pillar Tip Spacing by Ag Sputtering

Huang¹,

Meng²,

Huang³

et al. 2010

Advanced Materials

222

158

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Ag-capped Au nanopillar arrays on a resin supporter (see left upper figure), with a typical adjacent pillar tip gap of 10 nm, show obviously higher surface-enhanced Raman scattering (SERS) sensitivity (right column in red) than that of the bare Au nanopillar array while using 10 nM R6G as probe molecules. The large-area Ag-capped Au nanopillar array has potential in trace detection of special chemicals.

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Section: Doi: 101002/adma201001179mentioning

confidence: 99%

Improved SERS Performance from Au Nanopillar Arrays by Abridging the Pillar Tip Spacing by Ag Sputtering

Huang¹,

Meng²,

Huang³

et al. 2010

Advanced Materials

222

158

View full text Add to dashboard Cite

show abstract

“…In a typical pretreatment procedure, the samples are first immersed in an aqueous solution of probe molecules for several hours or even overnight, to ensure a homogeneous distribution of probe molecules, and subsequently washed thoroughly with water to remove unbound probe molecules. [22,28] Therefore, a desirable SERS substrate should be stable and durable in an aqueous solution.…”

Section: Stabilitymentioning

confidence: 99%

Large‐Area Silver‐Coated Silicon Nanowire Arrays for Molecular Sensing Using Surface‐Enhanced Raman Spectroscopy

Zhang

Wang

et al. 2008

Adv Funct Materials

361

220

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A new and facile method to prepare large‐area silver‐coated silicon nanowire arrays for surface‐enhanced Raman spectroscopy (SERS)‐based sensing is introduced. High‐quality silicon nanowire arrays are prepared by a chemical etching method and used as a template for the generation of SERS‐active silver‐coated silicon nanowire arrays. The morphologies of the silicon nanowire arrays and the type of silver‐plating solution are two key factors determining the magnitude of SERS signal enhancement and the sensitivity of detection; they are investigated in detail for the purpose of optimization. The optimized silver‐coated silicon nanowire arrays exhibit great potential for ultrasensitive molecular sensing in terms of high SERS signal enhancement ability, good stability, and reproducibility. Their further applications in rapidly detecting molecules relating to human health and safety are discussed. A 10 s data acquisition time is capable of achieving a limit of detection of approximately 4 × 10−6 M calcium dipicolinate (CaDPA), a biomarker for anthrax. This value is 1/15 the infectious dose of spores (6 × 10−5 M required), revealing that the optimized silver‐coated silicon nanowire arrays as SERS‐based ultrasensitive sensors are extremely suitable for detecting Bacillus anthracis spores.

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“…Various NP arrays using e-beam lithography 32 , anodized aluminum oxide templates 33,35 , nanoimprinting 34 , oxygen-plasma-stripping-of-photoresist technique 36 , ion milling 37 , interference lithography 38,40 , and coating of multi-walled carbon nanotubes 39 have been reported. Recently, we have developed a new method to fabricate wafer scale Ag-capped Si nanopillar (Ag NP) SERS substrates utilizing maskless lithography.…”

Section: Introductionmentioning

confidence: 99%

Wafer-Scale Leaning Silver Nanopillars for Molecular Detection at Ultra-Low Concentrations

Rindzevicius

Schmidt

et al. 2015

J. Phys. Chem. C

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Wafer-scale surface-enhanced Raman scattering (SERS) substrates fabricated using maskless lithography are important for scalable production targets. Large-area, leaning silver-capped silicon nanopillar (Ag NP) structures suitable for SERS molecular detection at extremely low analyte concentrations are investigated. Theoretical results show that isolated Ag NPs essentially support two localized surface plasmon (LSP) modes. The most prominent LSP resonance is observed in the near-infrared region (~800 nm) and can be tuned by changing the diameter of the silicon nanopillars (Si NPs). The corresponding electric field distribution maps indicate that the maximum E-field enhancement is found at the Ag cavity, i.e. the bottom part of the Ag cap. We argue that the plasmon coupling between the resonant Ag cap cavities contributes most to the enhancement of the Raman signal. We experimentally evaluate these findings and show that by exposing Si NPs to an O 2 -plasma the average Ag NP cluster size, and thus the overall inter-pillar coupling, can be systematically reduced. We show that deposition of Cr adhesion layers on Si NPs (>3 nm) introduce plasmon coupling loss to the Ag NP LSP cavity mode that significantly reduces the SERS intensity. Results also show that short exposures to the O 2 -plasma and the use of 1-3 nm Cr adhesion layers are advantageous for reducing the signal background noise from Ag NPs. In addition, influence of the Ag NP height and Ag metal thickness on SERS intensities is investigated and optimal fabrication process parameters are evaluated. Finally, the SERS spectrum from 100 pM of trans-1,2-bis (4-pyridyl) ethylene (BPE) is recorded showing distinct characteristic Raman vibrational modes. The calculated enhancement factor is of the order of 10 8 , and the SERS signal intensity exhibits a standard deviation of around 14% (660 data points) across a 5x5 mm 2 surface area.

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Controlled Fabrication of Nanopillar Arrays as Active Substrates for Surface-Enhanced Raman Spectroscopy

Cited by 99 publications

References 38 publications

Improved SERS Performance from Au Nanopillar Arrays by Abridging the Pillar Tip Spacing by Ag Sputtering

Improved SERS Performance from Au Nanopillar Arrays by Abridging the Pillar Tip Spacing by Ag Sputtering

Large‐Area Silver‐Coated Silicon Nanowire Arrays for Molecular Sensing Using Surface‐Enhanced Raman Spectroscopy

Wafer-Scale Leaning Silver Nanopillars for Molecular Detection at Ultra-Low Concentrations

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