Studies of SERS efficiency of gold coated porous silicon formed on rough silicon backside

Dridi, Hamida; Haji, Lazhar; Moadhen, A.

doi:10.1016/j.apsusc.2017.06.251

Cited by 17 publications

(13 citation statements)

References 17 publications

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“…Ag-NPs usually exhibit better plasmonic enhancement of SERS, but they do not possess surface stability and biocompatibility in comparison with Au-NPs [ 42 ]. Moreover, by adjusting the size, shape, and concentration of Au-NPs on the surfaces of semiconductor-based nanostructures, one can create new photonic materials with unique properties for biosensing applications [ 8 , 43 , 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Scattering from Dye Molecules in Silicon Nanowire Structures Decorated by Gold Nanoparticles

Ikramova

Utegulov

Dikhanbayev

et al. 2022

IJMS

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Silicon nanowires (SiNWs) prepared by metal-assisted chemical etching of crystalline silicon wafers followed by deposition of plasmonic gold (Au) nanoparticles (NPs) were explored as templates for surface-enhanced Raman scattering (SERS) from probe molecules of Methylene blue and Rhodamine B. The filling factor by pores (porosity) of SiNW arrays was found to control the SERS efficiency, and the maximal enhancement was observed for the samples with porosity of 55%, which corresponded to dense arrays of SiNWs. The obtained results are discussed in terms of the electromagnetic enhancement of SERS related to the localized surface plasmon resonances in Au-NPs on SiNW’s surfaces accompanied with light scattering in the SiNW arrays. The observed SERS effect combined with the high stability of Au-NPs, scalability, and relatively simple preparation method are promising for the application of SiNW:Au-NP hybrid nanostructures as templates in molecular sensorics.

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Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Scattering from Dye Molecules in Silicon Nanowire Structures Decorated by Gold Nanoparticles

Ikramova

Utegulov

Dikhanbayev

et al. 2022

IJMS

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“…The two widely accepted mechanisms for the SERS effect are the electromagnetic mechanism (EM) and the chemical mechanism (CM). For the EM effect, noble metals are widely used in SERS method because of significant enhancement in signal due to high electromagnetic fields around metallic structures [ 5 , 6 , 7 , 8 ]. The presence of metallic structure could provide a boost of several orders of magnitude to SERS signals.…”

Section: Introductionmentioning

confidence: 99%

Using Si/MoS2 Core-Shell Nanopillar Arrays Enhances SERS Signal

Liu

Shieh

et al. 2021

Nanomaterials

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Two-dimensional layered material Molybdenum disulfide (MoS2) exhibits a flat surface without dangling bonds and is expected to be a suitable surface-enhanced Raman scattering (SERS) substrate for the detection of organic molecules. However, further fabrication of nanostructures for enhancement of SERS is necessary because of the low detection efficiency of MoS2. In this paper, period-distribution Si/MoS2 core/shell nanopillar (NP) arrays were fabricated for SERS. The MoS2 thin films were formed on the surface of Si NPs by sulfurizing the MoO3 thin films coated on the Si NP arrays. Scanning electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy were performed to characterize Si/MoS2 core-shell nanostructure. In comparison with a bare Si substrate and MoS2 thin film, the use of Si/MoS2 core-shell NP arrays as SERS substrates enhances the intensity of each SERS signal peak for Rhodamine 6G (R6G) molecules, and especially exhibits about 75-fold and 7-fold enhancements in the 1361 cm−1 peak signal, respectively. We suggest that the Si/MoS2 core-shell NP arrays with larger area could absorb more R6G molecules and provide larger interfaces between MoS2 and R6G molecules, leading to higher opportunity of charge transfer process and exciton transitions. Therefore, the Si/MoS2 core/shell NP arrays could effectively enhance SERS signal and serve as excellent SERS substrates in biomedical detection.

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“…18−24 Thus, development of high SERS-active substrates based on metallic nanostructures-decorated PSi remains an active area of research. A number of different techniques have been developed to synthesize plasmonic silver (Ag) or gold (Au) nanostructures (nanoparticles, 25−27 nanoplates, 28,29 and nanodendrites 30−32 ) on PSi, such as thermal decomposition, 33−35 wet chemical deposition, 36 physical vapor deposition, 37 and immersion plating. 31,35,38−40 However, every method is met with issues: immersion plating takes a long time and has low efficiency, whereas the other techniques require the use of tedious preparations, sophisticated equipmental environment, and conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Usually, noble metal nanostructures with unique plasmonic properties are incorporated into PSi substrates to achieve strong enhancement of Raman scattering for detection of biomolecules with high sensitivity. − Thus, development of high SERS-active substrates based on metallic nanostructures-decorated PSi remains an active area of research. A number of different techniques have been developed to synthesize plasmonic silver (Ag) or gold (Au) nanostructures (nanoparticles, − nanoplates, , and nanodendrites − ) on PSi, such as thermal decomposition, − wet chemical deposition, physical vapor deposition, and immersion plating. ,,− However, every method is met with issues: immersion plating takes a long time and has low efficiency, whereas the other techniques require the use of tedious preparations, sophisticated equipmental environment, and conditions. More importantly, in all of these techniques, a PSi substrate needs to be fabricated before metal nanostructures are deposited on it.…”

Section: Introductionmentioning

confidence: 99%

Silver Nano-Dendrite-Plated Porous Silicon Substrates Formed by Single-Step Electrochemical Synthesis for Surface-Enhanced Raman Scattering

Wei

Ding

et al. 2020

ACS Appl. Nano Mater.

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Nanostructured layers composed of porous silicon (PSi)-based silver (Ag) nanodendrites have been formed by a simple single-step electrochemical anodic oxidation process on p-type silicon substrate. A mixture of hydrofluoric acid (HF), silver nitrate (AgNO 3 ), and dimethylformamide (DMF) solution was used as the electrolyte to form PSi and nanoscaled Ag structures simultaneously in a few minutes without any post treatment. We studied the influence of the anodization parameters on the morphologies of Ag-PSi structures. The results show that the metallic Ag attached to PSi surfaces completed the conversion from nanoparticles to nanodendrites with the increase of AgNO 3 concentrations, along with the increase of the number, size, and the area they covered of dendrites. The sensitivity and stability of the Ag dendrites-coated PSi substrate were evaluated using Rhodamine 6G (R6G) as probe molecule. This Ag-PSi substrate exhibits high surface-enhanced Raman scattering (SERS) response, good reproducibility, and outstanding long-time stability with a detection limit of R6G as low as 10 −11 M. This single-step systhesis technique provides a simple method for preparation of SERS-active substrates with high sensitivity and stability, representing a promising SERS platform for chemical and biomolecule detections.

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Studies of SERS efficiency of gold coated porous silicon formed on rough silicon backside

Cited by 17 publications

References 17 publications

Surface-Enhanced Raman Scattering from Dye Molecules in Silicon Nanowire Structures Decorated by Gold Nanoparticles

Surface-Enhanced Raman Scattering from Dye Molecules in Silicon Nanowire Structures Decorated by Gold Nanoparticles

Using Si/MoS2 Core-Shell Nanopillar Arrays Enhances SERS Signal

Silver Nano-Dendrite-Plated Porous Silicon Substrates Formed by Single-Step Electrochemical Synthesis for Surface-Enhanced Raman Scattering

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