ZnO nanotower arrays decorated with cubic and tetrahedral shaped Ag-NPs as hybrid SERS-active substrates

Zeng, Yulian; Wang, Fengyan; Du, Daxue; Liu, Shan; Wang, Chenbo; Xu, Zhaopeng; Wang, Haiyan

doi:10.1016/j.apsusc.2020.148924

Cited by 20 publications

(8 citation statements)

References 45 publications

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“…Figure 6 a shows the Raman peaks of 10 −8 M R6G spin-coated on the substrate S1, S2, S3, and Figure 6 b shows the peak intensity of 0.01M R6G spin-coated on the silicon wafer. Figure 6 c shows that the SERS spectra of R6G at different concentrations ranging from 10 −10 to 10 −6 M with the volume of 20 µL, and Raman peaks at 609, 768, 1361, 1510, 1640 cm −1 are clearly observed [ 23 , 41 ]. The spectra reveal that an R6G concentration as low as 10 −8 M can still exhibit observable signals.…”

Section: Resultsmentioning

confidence: 99%

Revealing the Hemispherical Shielding Effect of SiO2@Ag Composite Nanospheres to Improve the Surface Enhanced Raman Scattering Performance

Wang

Liu

et al. 2021

Nanomaterials

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Many studies widely used SiO2@Ag composite nanospheres for surface enhanced Raman scattering (SERS), which mainly contributes to electromagnetic enhancement. In addition to experiments, previous simulations mostly adopted a two-dimensional model in SERS research, resulting in the three-dimensional information being folded and masked. In this paper, we adopted the three-dimensional model to simulate the electric field distribution of SiO2@Ag composite nanospheres. It is found that when the Ag nanoparticles are distributed densely on the surface of SiO2 nanospheres, light cannot pass through the upper hemisphere due to the local surface plasmon resonance (LSPR) of the Ag nanoparticles, resulting in the upper hemisphere shielding effect; and if there are no Ag nanoparticles distributed densely on the surface of SiO2 nanospheres, the strong LSPR cannot be formed, so the incident light will be guided downward through the whispering gallery mode of the spherical structure. At the same time, we designed relevant experiments to synthesize SiO2@Ag composite nanosphere as SERS substrate and used Rhodamine 6G as a probe molecule to study its SERS performance. This design achieved a significant SERS effect, and is very consistent with our simulation results.

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Section: Resultsmentioning

confidence: 99%

Revealing the Hemispherical Shielding Effect of SiO2@Ag Composite Nanospheres to Improve the Surface Enhanced Raman Scattering Performance

Wang

Liu

et al. 2021

Nanomaterials

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“…LOD level is comparable to other SERS approaches without any surface modification or pre-treatment requirement. [16,25] for R6G and 4.8 for triclosan [36,37]) that directly affects the solubility and distribution of these two analytes in the octanol-water biphasic system. [38] The level of LOD employed is comparable to other plasmonic nanoparticle labeled SERS approaches without any surface modification or pre-treatment.…”

Section: Extremely Low Limit Of Detection (Lod)mentioning

confidence: 99%

“…[11,12] Various strategies have been developed to date for enhancing Raman signals, such as manipulating and tailoring the SERS substrates, modifying suitable experimental conditions for the measurements, and using noble metal nanoparticles for improvement. [14][15][16][17] There are numerous challenges associated with achieving homogeneous hot spot distribution and reproducibility on SERS substrates, as signals are influenced by the distribution of analytes and nanoprobes, among many other factors. [17][18][19] To achieve the ultrasensitivity of SERS detection of analytes, sophisticated surfaces with controlled morphology of plasmonic nanoparticles are required.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive Surface–Enhanced Raman Spectroscopy Detection by Porous Silver Supraparticles from Self–lubricating Drop Evaporation

Dabodiya

Sontti

Wei

et al. 2022

Preprint

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This work demonstrates an original and ultrasensitive approach for Surface-Enhanced Raman Spectroscopy (SERS) detection based on evaporation of self-lubricating drops containing silver supraparticles. The developed method detected an extremely low concentration of analyte that was enriched and concentrated on sensitive SERS sites of the compact supraparticles formed from drop evaporation. A low limit of detection (LOD) of 10-16 M was achieved for a model hydrophobic compound rhodamine 6G (R6G). The quantitative analysis of R6G concentration was obtained from 10-5 M to 10-11 M. In addition, for a model micropollutant in water triclosan, the detection limit of 10-6 M was achieved by using microliter sample solutions. The intensity of SERS detection in our approach was robust to the dispersity of the nanoparticles in the drop but became stronger after a longer drying time. The mechanism underlying the ultrasensitive detection is the sequential process of concentration, extraction, and absorption of the analyte during evaporation of self-lubrication drop and hot spot generation for intensification of SERS signals. This novel approach for sample preparation in ultrasensitive SERS detection can be applied to the detection of chemical and biological signatures in areas such as environment monitoring, food safety, and biomedical diagnostics.

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Section: Introductionmentioning

confidence: 99%

Ultrasensitive Surface‐Enhanced Raman Spectroscopy Detection by Porous Silver Supraparticles from Self–Lubricating Drop Evaporation

Dabodiya

Sontti

Wei

et al. 2022

Adv Materials Inter

View full text Add to dashboard Cite

This work demonstrates an original and ultrasensitive approach for surface‐enhanced Raman spectroscopy (SERS) detection based on evaporation of self‐lubricating drops containing silver supraparticles. The developed method detects an extremely low concentration of analyte that is enriched and concentrated on sensitive SERS sites of the compact supraparticles formed from drop evaporation. A low limit of detection of 10−16 m is achieved for a model hydrophobic compound rhodamine 6G (R6G). The quantitative analysis of R6G concentration is obtained from 10−5 to 10−11 m. In addition, for a model micro‐pollutant in water triclosan, the detection limit of 10−6 m is achieved by using microliter sample solutions. The intensity of SERS detection in this approach is robust to the dispersity of the nanoparticles in the drop but became stronger after a longer drying time. The ultrasensitive detection mechanism is the sequential process of concentration, extraction, and absorption of the analyte during evaporation of self‐lubrication drop and hot spot generation for intensification of SERS signals. This novel approach for sample preparation in ultrasensitive SERS detection can be applied to the detection of chemical and biological signatures in areas such as environment monitoring, food safety, and biomedical diagnostics.

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ZnO nanotower arrays decorated with cubic and tetrahedral shaped Ag-NPs as hybrid SERS-active substrates

Cited by 20 publications

References 45 publications

Revealing the Hemispherical Shielding Effect of SiO2@Ag Composite Nanospheres to Improve the Surface Enhanced Raman Scattering Performance

Revealing the Hemispherical Shielding Effect of SiO2@Ag Composite Nanospheres to Improve the Surface Enhanced Raman Scattering Performance

Ultrasensitive Surface–Enhanced Raman Spectroscopy Detection by Porous Silver Supraparticles from Self–lubricating Drop Evaporation

Ultrasensitive Surface‐Enhanced Raman Spectroscopy Detection by Porous Silver Supraparticles from Self–Lubricating Drop Evaporation

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