Black-Si as a platform for sensing

Gervinskas, Gediminas; Michaux, P.; Seniutinas, Gediminas; Hartley, Jennifer S.; Mayes, Edwin L. H.; Verma, Roli; Gupta, Banshi D.; Stoddart, Paul R.; Morrish, Dru; Fahim, N.F.; Hossain, Md. Sazzad; Juodkazis, Saulius

doi:10.1117/12.2033707

Cited by 2 publications

(3 citation statements)

References 33 publications

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“…Compared to the 1 μm SiNWs, the 10 μm SiNWs exhibit much lower reflectivity (below 8%) in the visible spectrum range due to the enhanced light trapping of higher SiNWs. In the previous research on SiNW-based SERS substrates, the large surface area of the SiNWs is featured for enhancing SERS signals [9,10,[12][13][14]. On the other hand, high aspect ratio SiNWs are also applied as black Si surfaces to exhibit an anti-reflection property.…”

Section: Resultsmentioning

confidence: 99%

“…The advantages of the vertical dimension were not fully developed. Black Si surfaces fabricated by reactive ion etching were investigated by Gervinskas et al for SERS sensing [13,14]. They discussed the influences on SERS signals at different thicknesses of the metal film coating and different solid angles (numerical aperture of excitation/collection optics) on the detection signals.…”

Section: Introductionmentioning

confidence: 99%

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High aspect ratio SiNW arrays with Ag nanoparticles decoration for strong SERS detection

Yang¹,

Li²,

Gong³

et al. 2014

Nanotechnology

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Well-ordered silicon nanowires (SiNWs) are applied as surface-enhanced Raman scattering (SERS) substrates. Laser interference lithography is used to fabricate large-area periodic nanostructures. By controlling the reaction time of metal assisted chemical etching, various aspect ratios of SiNWs are generated. Ag nanoparticles are decorated on the substrates via redox reaction to allow a good coverage of Ag over the SiNWs. As the height of the SiNWs increases, the light scattering inside the structures is enhanced. The number of the probing molecules within the detection volume is increased as well. These factors contribute to stronger light-matter interaction and thus lead to higher SERS signal intensity. However, the light trapping effect is more significant for higher SiNWs, which prevents the detection of the SERS signals. An optimized aspect ratio ∼5:1 (1 μm height and 200 nm width) for the SiNW array is found. The well-ordered SiNWs demonstrate better SERS signal intensity and uniformity than the randomly arranged SiNWs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High aspect ratio SiNW arrays with Ag nanoparticles decoration for strong SERS detection

Yang¹,

Li²,

Gong³

et al. 2014

Nanotechnology

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show abstract

“…4,9 The large surface area and well-ordered patterning provide a huge potential to improve the SERS detection sensitivity and signal uniformity. Future work is required to investigate optimized geometry, such as period and aspect ratio of the SiNWs and to develop the best approach to decorate metal nanostructures on the SiNWs for SERS sensing applications.…”

Section: Nmmentioning

confidence: 99%

Fabrication of SiNW arrays by laser means and its applications in SERS detections

2014

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Silicon nanowire (SiNW) arrays are fabricated by laser interference lithography (LIL) and metal assisted chemical etching. The LIL produces well-ordered surface nanostructures and the following metal assisted chemical etching configures the patterns into high-aspect-ratio three dimensional (3D) nanostructures. The SiNWs exhibit strong antireflection properties. The surface reflection decreases with the height of SiNWs. With Ag thin film coating, such black Si surfaces are applied as surface enhanced Raman scattering (SERS) substrates to measure the 4-methylbenzenethiol molecules adsorbed on the sample surface. The change of SERS signal intensity with the height of SiNWs is investigated. Higher SiNWs exhibit stronger SERS signals due to the large surface area. Meanwhile, Ag nanoparticles (NPs') decoration on SiNWs via either thermal annealing or redox reaction has been demonstrated for the SERS detection in comparison to Ag film coating. Ag NPs' decoration by redox reaction greatly improves the SERS signal intensity due to the generation of high density hotspots. However, the thermal annealing method weakens the SERS signals due to oxidation of Ag NPs.

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Black-Si as a platform for sensing

Cited by 2 publications

References 33 publications

High aspect ratio SiNW arrays with Ag nanoparticles decoration for strong SERS detection

High aspect ratio SiNW arrays with Ag nanoparticles decoration for strong SERS detection

Fabrication of SiNW arrays by laser means and its applications in SERS detections

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