Construction of Ag nanowire@Au nanoparticle nano nests with densely stacked small gaps for actively trapping molecules to realize diversity SERS detection

Abstract

Highly sensitive Surface-enhanced Raman spectroscopy (SERS) sensing not only depends on the active substrate with high density of hot spots, but also depends more on whether the molecules can effectively...

Surface-Enhanced Raman Spectroscopy Sensor Integrated with Ag@ZIF-8@Au Core–Shell–Shell Nanowire Membrane for Enrichment, Ultrasensitive Detection, and Inactivation of Bacteria in the Environment

“…The ZIF-8 shell provides many active sites, so the surface of AZA-NW is loaded with many A-NP, providing many hot spots for the SERS sensor. The densely stacked AZA-NW has abundant hotspots and produces capillary action, generating cohesive interactions between interlayer gaps, beneficial to bacterial capture and gathering them in hotspots, thereby improving the detection sensitivity of the SERS sensor. , …”

“…The densely stacked AZA-NW has abundant hotspots and produces capillary action, generating cohesive interactions between interlayer gaps, beneficial to bacterial capture and gathering them in hotspots, thereby improving the detection sensitivity of the SERS sensor. 58,59 The purity and crystal structure of ZIF-8, A-NW, and AZA-NW are characterized by X-ray diffraction (XRD) (Figure 1h). XRD patterns of ZIF-8 are consistent with the literature, suggesting the successful synthesis of ZIF-8.…”

“…The densely stacked AZA-NW has abundant hotspots and produces capillary action, generating cohesive interactions between interlayer gaps, beneficial to bacterial capture and gathering them in hotspots, thereby improving the detection sensitivity of the SERS sensor. 58 , 59 …”

Fabrication of High-Stability and -Sensitivity Perovskite Nanoparticles with a Core–Shell Structure for Surface-Enhanced Raman Scattering

“…The Niu et al study leverages the precision engineering of nanometer-scale gaps between gold nanocubes, facilitated by DNA origami . These meticulously crafted gaps create intense localized electromagnetic fields, known as hot spots, which are crucial for the amplification of SERS signals. , Moreover, the 785 nm laser reduces the fluorescence background, consequently enhancing Raman scattering. Additionally, the increased roughness of the substrate introduces more hot spots, and the extensive surface area of the substrate allows for the accumulation of more layers, enhancing the electric field, consistent with our simulation results, as shown in Figure .…”

Capillary-force-assisted self-assembly of gold nanoparticles into highly ordered plasmonic thin films for ultrasensitive SERS

“…But when the concentration was increased to 30%, this had some effect on the statistics due to agglomeration, resulting in a decrease in particle density. Regarding the influence of APTES, referring to previous studies, 41–44 there may be two reasons for this effect: (1) since AuNPs are positively charged by the hydrolysis of negatively charged citrate ions and APTES. The static interaction of NH 3+ groups is fixed on the inner surface of the capillary, and at low concentrations, this effect does not affect the movement of particles; but when the concentration of APTES increases, there may be stronger dipole interactions between them, resulting in the surface “slipped” to form a polymer structure, which went further and formed clusters; (2) due to the increase in the APTES concentration, the amino layer formed on the inner surface of the capillary was more uniform, and the amino layer was also formed on the flatter surface.…”