Electrodeposition of hierarchical Ag nanostructures on ITO glass for reproducible and sensitive SERS application

Bian, Juncao; Chen, Zhongdong; Li, Zhe; Yang, Fei; He, Hong; Wang, Juan; Tan, Jeannie Z. Y.; Zeng, Jie-Liang; Peng, Rui-Qun; Zhang, Xiwen; Han, Gaorong

doi:10.1016/j.apsusc.2012.03.093

Cited by 24 publications

(12 citation statements)

References 34 publications

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“…Figures of 9% [14] for standard deviation of SERS spectra have been quoted elsewhere, where commercial nanoparticles were used as a substrate. However, SERS substrates offering relative standard deviations of up to 25% have been considered good in terms of reproducibility [23,24]. It is also important to note that there are no peaks in the spectra that have been contributed by the flakes themselves.…”

Section: Flake Reproducibilitymentioning

confidence: 99%

Bridging the Gap between SERS Enhancement and Reproducibility by Salt Aggregated Silver Nanoparticles

Mehigan

Smyth

McCabe

2015

Nanomaterials and Nanotechnology

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Silver colloid based nanostructures are a very common means of achieving strong SERS signals. This is due to the hot spots that are formed in between the nanoparticles, as well as their ease of synthesis. They are frequently dismissed, however, as irreproducible when compared to other metal nanostructures, due to the random nature of their formation in a solution. Silver nanoparticle substrates or carefully constructed arrays can be made to be uniform, but they often require a large amount of time to produce, as well as expensive equipment. We will show that by making some adjustments to the experimental setup, silver colloids that have been aggregated to form large flakes can offer both the enhancement factor and reproducibility of many other more expensive and complicated SERS techniques. Silver colloids aggregated into large flake-like structures have been investigated for their surface-enhanced Raman spectroscopy (SERS) properties. These flakes have been imaged using scanning electron microscopy (SEM) and have also been characterized using UV/Vis spectroscopy. They have been highlighted as a cheap and simple means or achieving large Raman enhancement with strong reproducibility, especially when compared to many common methods of substrate fabrication that are more difficult to fabricate. Detection of Rhodamine 6G at a concentration of 5×10−13M has been achieved, as well as xanthopterin at a concentration of 5×10−9M.

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Section: Flake Reproducibilitymentioning

confidence: 99%

Bridging the Gap between SERS Enhancement and Reproducibility by Salt Aggregated Silver Nanoparticles

Mehigan

Smyth

McCabe

2015

Nanomaterials and Nanotechnology

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“…These RSD values are low enough, as compared with the SERS-active substrates reported previously. [8][9][10]12,14,15,47 Therefore, it has been demonstrated that the air-toluene-interface-mediated assembly method is useful for the quantitative investigation of SERS mechanisms as well as the fabrication of practical SERS substrates.…”

Section: Sers Properties On the Metal Nanoparticle Assembliesmentioning

confidence: 99%

“…In addition, in order to develop useful SERSactive metal nanostructures, the reproducibility of the SERS signals (i.e., site-by-site variations in the signal intensity) along with high sensitivity become important. [8][9][10][11][12][13][14][15] Therefore, methods for fabricating metal nanostructures with macroscopic and microscopic morphological uniformity are required for both fundamental and applied science.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of dense two-dimensional assemblies over vast areas comprising gold(core)—silver(shell) nanoparticles and their surface-enhanced Raman scattering properties

Sugawa

Tanoue

Ube

et al. 2013

Photochem Photobiol Sci

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Fabrication of dense two-dimensional assemblies consisting of gold(core)-silver(shell) nanoparticles and the resulting peculiar surface-enhanced Raman scattering (SERS) activity are reported. The assemblies were prepared via assembly at air-toluene interfaces by drop-casting toluene solutions containing the nanoparticles protected with octadecylamine molecules onto glass plates. This simple process, which does not require special apparatus or significant fabrication time, leads to uniform assemblies over vast areas (~34 cm(2)). In the SERS measurements, the high spatial reproducibility of the SERS signals from p-aminothiophenol adsorbed on the assemblies over vast areas demonstrates that this method is useful for the quantitative investigation of SERS mechanisms. Under 532 nm laser excitation, the difference in the enhancement factors of the SERS signals at the a1 mode between assemblies consisting of gold, silver, and core-shell nanoparticles can be explained by the degree of overlap of the excitation wavelength with their plasmon coupling modes. In contrast, under 785 nm excitation, even though the plasmon band of the core-shell nanoparticle assemblies does not significantly overlap with the excitation wavelength as compared with that of gold nanoparticle assemblies, the enhancement factor from the core-shell nanoparticle assemblies was stronger than those from the gold nanoparticle assemblies. Therefore, we have demonstrated that the gold(core)-silver(shell) nanoparticle assemblies are excellent SERS active materials, which have strong electromagnetic mechanism (EM) as well as chemical mechanism (CM) effects due to the silver shells.

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“…The enhancement factor of Ag is about two orders of magnitude larger than that of Au for the same nanostructure. 6,7 Substrate-supported Ag nanostructures are of great interest as they exhibit much better signal reproducibility than their solution-dispersed counterparts. [7][8][9][10][11] However, nanosilver is easily oxidized, even under ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

“…6,7 Substrate-supported Ag nanostructures are of great interest as they exhibit much better signal reproducibility than their solution-dispersed counterparts. [7][8][9][10][11] However, nanosilver is easily oxidized, even under ambient conditions. The thickness of the Ag x O shell layer increases with time, which can decrease the surface electric fields.…”

Section: Introductionmentioning

confidence: 99%

A durable surface-enhanced Raman scattering substrate: ultrathin carbon layer encapsulated Ag nanoparticle arrays on indium-tin-oxide glass

Bian

Huang

et al. 2015

Phys. Chem. Chem. Phys.

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The application of Ag nanostructures to surface-enhanced Raman scattering (SERS) is hindered by their chemical instability. Fabrication of durable Ag-based SERS substrates is therefore of great significance in practical applications. In this work, ultrathin C-layer-encapsulated Ag nanoparticle arrays (UCL-Ag-NAs) are successfully fabricated on the surface of indium-tin-oxide (ITO) glass, using a hydrothermal method, for use as durable SERS substrates. The problem of Ag nanoparticles dissolving during the hydrothermal process is solved by using ZnO powder as a pH-buffering reagent. The SERS signal intensity of UCL-Ag-NAs decreases, accompanied by an improvement in Raman signal stability, as the C-layer thickness increases. Raman spectra show that the SERS signal intensities obtained from UCL-Ag-NAs with C-layers of 4.5 nm and 7.3 nm stored for 180 days are 64.9% and 77.8% of those obtained from as-prepared counterparts. The SERS intensity of the UCL-Ag-NA (C-layer of 4.5 nm) is 152.7% that of the bare Ag NA after 180 days of storage. XPS spectra confirm that the C-layer effectively suppresses the oxidation of the Ag NA. This methodology can be generalized to improve the durability of other dimensional Ag nanostructures for SERS applications.

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Electrodeposition of hierarchical Ag nanostructures on ITO glass for reproducible and sensitive SERS application

Cited by 24 publications

References 34 publications

Bridging the Gap between SERS Enhancement and Reproducibility by Salt Aggregated Silver Nanoparticles

Bridging the Gap between SERS Enhancement and Reproducibility by Salt Aggregated Silver Nanoparticles

Fabrication of dense two-dimensional assemblies over vast areas comprising gold(core)—silver(shell) nanoparticles and their surface-enhanced Raman scattering properties

A durable surface-enhanced Raman scattering substrate: ultrathin carbon layer encapsulated Ag nanoparticle arrays on indium-tin-oxide glass

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