Silicon nanowire arrays coated with electroless Ag for increased surface-enhanced Raman scattering

Bai, Fan; Li, Meicheng; Fu, Pengfei; Li, Ruike; Gu, Tiansheng; Huang, Rui; Zhao, Chen; Li, Yingfeng

doi:10.1063/1.4921040

Cited by 25 publications

(12 citation statements)

References 24 publications

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“…[2][3][4][5]14] The cone shaped bundles creation can be partially correlated with the SiNWs elasticity and surface tension during drying process. [1] Furthermore, the van der Waals force influences the SiNWs tips [1] and stick them more as the etching time increases.…”

Section: Resultsmentioning

confidence: 98%

“…We expect further progress in R6G detection limit and moving closer towards higher values of detection. [14] …”

Section: Resultsmentioning

confidence: 99%

“…Except SiNWs density and height, the critical factors were HF and AgNO3 concentration and SiNWs dipping time. [14] SiNWs can be also tapered and their surface roughness increased which additionally contributes to SERS enhancement. [15] The goal of this paper was to fabricate SiNWs and test their SERS features.…”

Section: Introductionmentioning

confidence: 99%

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Silicon Nanowires Substrates Fabrication for Ultra-Sensitive Surface Enhanced Raman Spectroscopy Sensors

Gebavi¹,

Mikac²,

Marciuš

et al. 2017

Croat. Chem. Acta

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Abstract:The silicon based substrates for surface enhanced Raman spectroscopy (SERS) have been synthesized and tested. The silver-assisted electroless wet chemical etching method has been utilized for silicon nanowires production which has been proved as the promising SERS substrate. The morphology of the silicon nanowires coated with silver nanoparticles has been examined by scanning electron microscopy. The SERS measurements tested on rhodamine 6G molecules indicated the optimal silicon nanowire substrate production obtained for 5 M hydrofluoric acid and 30 mM silver nitrate etching solution. The results show SERS detection limit of 10 -8 M rhodamine in aqueous solution.

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Section: Resultsmentioning

confidence: 98%

“…We expect further progress in R6G detection limit and moving closer towards higher values of detection. [14] …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Silicon Nanowires Substrates Fabrication for Ultra-Sensitive Surface Enhanced Raman Spectroscopy Sensors

Gebavi¹,

Mikac²,

Marciuš

et al. 2017

Croat. Chem. Acta

View full text Add to dashboard Cite

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“…Electroless deposition method composing of a simple immerse of the SiNWs into an AgNO 3 aqueous solution is utilized for deposition of Ag NPs . Before the electroless deposition, the samples are immersed in a solution of 5% hydrogen fluoride (HF) to remove a thin native oxide layer from the SiNW outer surface, which probably has built up after the CVD growth process.…”

Section: Methodsmentioning

confidence: 99%

Surface‐enhanced Raman spectroscopy of dye molecules on Ag‐modified silicon nanowire substrates: influence of photoinduced probe degradation on enhancement factors

Mehrvar

Sadeghipari

Tavassoli

et al. 2017

J Raman Spectroscopy

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Photobleaching effect is an immense problem in optical spectroscopy, especially when fluorophores are adsorbed on metal nanoparticles (NPs). Nevertheless, little effort has been assigned to the study of fluorophore photostability under this condition. In this paper, the effect of photobleaching on the Raman signal enhancement factor (RS‐EF) of dye molecules on Ag‐modified silicon nanowire (SiNW) substrates is investigated. For this purpose, SiNWs are fabricated by using the vapor–liquid–solid growth mechanism and decorated with Ag NPs by means of electroless deposition method. This process provides the possibility of forming uniformly and tightly packed Ag NPs on SiNWs. The effect of photostability of the crystal violet as analyte molecules on surface‐enhanced Raman spectroscopy is investigated as a function of time evolution and laser power. The influence of Ag NP deposition time on Raman signal enhancement is explored. Our work shows how we can optimize the excitation power for achievement of higher RS‐EF and, consequently, lower detectable concentration. Time evolution of surface‐enhanced Raman spectroscopy signal shows an exponential decay behavior, which indicates an almost uniform distribution of EFs. Capability of our nanostructure is assessed for different concentration, and subsequently, limit of detection of 10 pm with RS‐EF of 2.4×109 is obtained. Copyright © 2017 John Wiley & Sons, Ltd.

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“…Decoration of Ag NPs on the side walls of Si‐NCF arrays is performed using electroless deposition method . The NCF arrays are plunged into an aqueous solution AgNO 3 /HF (0.5 mM AgNO 3 , 9% HF) for 20‐s time intervals at room temperature.…”

Section: Fabrication Proceduresmentioning

confidence: 99%

Fabrication of Ag‐modified nanocone frustum arrays with controlled shape as active substrates for surface‐enhanced Raman scattering

Mehrvar

Sadeghipari

Tavassoli

et al. 2019

J Raman Spectroscopy

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Surface‐enhanced Raman scattering (SERS) substrates utilizing the interparticle nanogaps as hot spots can provide ultrasensitive and geometry‐dependent enhancement factors in analyte detection. Here, we report theoretical and experimental studies on the optical properties of Ag nanoparticles‐decorated Si‐nanocone frustum (NCF) arrays with various geometrical dimensions to enable engineering of the most effective SERS substrate. Our fabrication steps include electron beam lithography, deep reactive‐ion etching, and metallization. In this regard, the effect of geometrical parameters including height, diameter, and slant angle, associated with Si‐NCF arrays, on optical properties and SERS effect are investigated. Results show that the NCF array with larger height and slant angle exhibit higher antireflection property and excellent performance for low‐concentration analyte molecules detection. Furthermore, our results show that the excitation of Mie resonances in NCF arrays leads to formation of near electric field distributions and enhancement of Si Raman lines. It is demonstrated that the strength of Si Raman line follows the trend of the integrated near electric fields in the excitation volume.

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Silicon nanowire arrays coated with electroless Ag for increased surface-enhanced Raman scattering

Cited by 25 publications

References 24 publications

Silicon Nanowires Substrates Fabrication for Ultra-Sensitive Surface Enhanced Raman Spectroscopy Sensors

Silicon Nanowires Substrates Fabrication for Ultra-Sensitive Surface Enhanced Raman Spectroscopy Sensors

Surface‐enhanced Raman spectroscopy of dye molecules on Ag‐modified silicon nanowire substrates: influence of photoinduced probe degradation on enhancement factors

Fabrication of Ag‐modified nanocone frustum arrays with controlled shape as active substrates for surface‐enhanced Raman scattering

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