“…For ASN structures, the two absorption peaks around 600–700 and 800–900 nm are from the LSPR between the Ag nanoparticles and between the nanocavities and Ag nanoparticles. However, the existence of absorption peaks in these regions may also be caused by the reflection of light because the diameter of nanocavities varies from hundreds of nanometers, so for higher wavelengths, they may act as mirrors …”
Section: Resultsmentioning
confidence: 99%
“…However, the existence of absorption peaks in these regions may also be caused by the reflection of light because the diameter of nanocavities varies from hundreds of nanometers, so for higher wavelengths, they may act as mirrors. 41 The SERS performances of the AgNP array are evaluated using 2-NTT as the probe molecule, which shows the dependences of the enhanced EM fields on the number, size, and distribution of AgNPs, as shown in Figure 4b. Compared with the planar Ag film, all the patterned films show the significant SERS observations.…”
Based on etched PS sphere arrays, the different growths of Ag nanoparticles with tunable LSPR are designed when SiO 2 -25 nm/Ag-30 nm/SiO 2 -100 nm sandwich nanocavity structures are annealed at 500 °C, including the hexagonal silver nanoparticle rings, circular silver nanoparticle rings, and aggregated silver nanoparticles. The uniformity of particle size and regularity of position generate enhanced electromagnetic field and good surface-enhanced Raman spectroscopy signals as confirmed by UV−vis observation and finite difference time domain method simulation. The developed nanostructures are effectively used as stable, nonreproducible, and markable anti-counterfeiting signs.
“…For ASN structures, the two absorption peaks around 600–700 and 800–900 nm are from the LSPR between the Ag nanoparticles and between the nanocavities and Ag nanoparticles. However, the existence of absorption peaks in these regions may also be caused by the reflection of light because the diameter of nanocavities varies from hundreds of nanometers, so for higher wavelengths, they may act as mirrors …”
Section: Resultsmentioning
confidence: 99%
“…However, the existence of absorption peaks in these regions may also be caused by the reflection of light because the diameter of nanocavities varies from hundreds of nanometers, so for higher wavelengths, they may act as mirrors. 41 The SERS performances of the AgNP array are evaluated using 2-NTT as the probe molecule, which shows the dependences of the enhanced EM fields on the number, size, and distribution of AgNPs, as shown in Figure 4b. Compared with the planar Ag film, all the patterned films show the significant SERS observations.…”
Based on etched PS sphere arrays, the different growths of Ag nanoparticles with tunable LSPR are designed when SiO 2 -25 nm/Ag-30 nm/SiO 2 -100 nm sandwich nanocavity structures are annealed at 500 °C, including the hexagonal silver nanoparticle rings, circular silver nanoparticle rings, and aggregated silver nanoparticles. The uniformity of particle size and regularity of position generate enhanced electromagnetic field and good surface-enhanced Raman spectroscopy signals as confirmed by UV−vis observation and finite difference time domain method simulation. The developed nanostructures are effectively used as stable, nonreproducible, and markable anti-counterfeiting signs.
“…The strong resonance peak at 320 nm originates from the cavity mode [ 40 ]. The weak resonance peak at 380 nm corresponds to the surface plasmon polariton (defined as the SPP mode), which propagates along the top of the nanocavity film surface [ 41 ].…”
At present, the use of efficient and cost-effective methods to construct plasmonic surface-enhanced Raman scattering (SERS) substrates of high sensitivity, uniformity and reproducibility is still crucial to satisfy the practical application of SERS technology. In this paper, a localized surface plasmonic resonance (LSPR) tunable flexible Ag@PDMS substrate was successfully constructed by the low-cost bio-template-stripping method and magnetron sputtering technology. The theory proves that the local electromagnetic field enhancement and “hot spot” distribution is adjustable by modifying the size of the optical cavity unit in the periodicity nanocavity array structure. Experimentally, using rhodamine 6G (R6G) as the target analyte, the SERS performance of optimal Ag@PDMS substrate (Ag film thickness for 315 nm) was researched in detail, which the minimum detection limit was 10−11 M and the enhancement factor was calculated as 8.03 × 108, indicating its high sensitivity. The relative standard deviation (RSD) was calculated as 10.38%, showing that the prepared substrate had excellent electromagnetic field enhancement uniformity. At last, the trace detection of Crystal violet (CV, LOD = 10−9 M) and the simultaneous detection of three common dyes (R6G, CV and Methylene blue (MB) mixture) were also realized. This result suggests that the SERS substrate has a good application prospect in the quantitative and qualitative detection of dye molecules.
“…18 Hexagonally ordered features (Figure 2) can also enhance hydrophobicity by strong pinning (Figure 3). 46 Figure 2.Schematic representation of hexagonally oriented features on the planar surface mentioned in Figure 3.Figure 3.Pinned water drop evaporation. Pinning causes the wetted area to remain the same.…”
Section: Theoretical Background Of Hydrophobicity At Nanostructured S...mentioning
confidence: 99%
“…21 A silicon hexagonally ordered nanorod array prepared by Zi-Wen et al, 47 where the Cassie model was adopted, shows a contact angle of 142°. For hexagonal geometry, the f s value is defined as 46 where d is the nanorod diameter, and a refers to the distance of nanorod midpoints and a is the nanorod separation distance. In a hydrophobic surface modification, the character of the nanorod tip has to be considered.…”
Section: Theoretical Background Of Hydrophobicity At Nanostructured S...mentioning
This review deals with different aspects of hydrophobicity at nanostructured surfaces. Theoretical and geometric effects as well as those of surface feature geometry on hydrophobicity are explored in this article. This review includes surface modification methods used to change surface hydrophobicity and effect on adhesion of cells as nano substrate. A small chapter is devoted to hydrophobicity at self-assembled monolayers as a special type of nanostructured surface. To the different models describing hydrophobicity is devoted one up to dated chapter. Calculation methods including quantum, density functional theory, and molecular modeling bring novel perspectives to the study of hydrophobicity at nanostructured surfaces.
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