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The quest for uniform, reproducible, and affordable enhancing substrates aimed at realizing the potential analytical applications of SERS .
SERS imaging can be accomplished either by probing molecules or very thin films adsorbed to a plasmonic Raman-enhancing substrate or by imaging a sample in which sites . The use of surface-enhanced Raman spectroscopy (SERS) in liquid solutions has always been challenging due to signal fluctuations, inconsistent data, and difficulties in .Achieving a high-density, repeatable, and uniform distribution of “hotspots” across the entire surface-enhanced Raman scattering (SERS) substrate is a current challenge in facilitating the .
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By detailing the influence of different nanomaterials (e.g., metallic nanoparticles, nanowires, and nanostars) and their structural features on the SERS effect, this article aims to .
The easy, scalable, and cost-effective method is capable of producing SERS substrates with average EFs as high as 10 7, and the relative standard deviation of the block-copolymer-derived templates is only 8% in the .SCTFC REPORTS 5:11644 DI: 10.1038srep11644 1 www.nature.comscientificreports Thickness of a metallic film, in addition to its roughness, plays a significant role in SERS activity ChangwonLee 1 . The 3D-finite-difference time-domain simulation results show that the SERS substrate with an Ag film thickness of 10 nm has tens of times the electric field intensity enhancement. The enhancement of SERS signal for TNA-coated substrate take place due to the anisotropic growth in the presence of Ag+ ions (Au, Ag 0.02-SERS substrate) and near-field effect. The limit of detection (LOD) of methylene blue with Au, Ag 0.02 -SERS substrate is lower than that in Au NPs based SERS substrate.
SERS measurement. The analytes we used in this experiment are adenine (Sigma-Aldrich, CAS 73-24-5) and melamine (Sigma-Aldrich, . On the other hand, the actual silver coating thickness of the SERS substrate fabricated by the sputtering process is 14 nm, 25 nm, 31 nm, 39 nm, 55 nm, and 81 nm, respectively. .
Results And Discussion. SERS activity of the 2D and 3D substrates prepared for this study is determined by several parameters: (i) nm-sized clusters formed during the sputtering process, (ii) 10 s of nm sized rough structures formed on PDMS during the vacuum phase of the sputtering process, (iii) the thickness of the thin film, and for the 3D nanovoid structures, (iv) the . 2-NT Raman probe molecules are attached to the surfaces of the fabricated substrates for SERS measurement to evaluate their performance. . To elucidate the presence of this phenomenon in the ANF substrate, gold of thickness varying from 20–80 nm is deposited onto the ANF by electron beam evaporation. The evaporated gold material agglomerate . Abstract Surface enhanced Raman spectroscopy (SERS) provides a useful sensory platform whereby target molecules at low concentration are identified, potentially detecting a single molecule. As a result, SERS has been widely applied in a variety of research endeavors using different substrates, one of which is a cellulose-based substrate. The .
Achieving a high-density, repeatable, and uniform distribution of “hotspots” across the entire surface-enhanced Raman scattering (SERS) substrate is a current challenge in facilitating the efficient preparation of large-area SERS substrates. In this study, we aim to produce homogeneous surface-enhanced Raman scattering (SERS) substrates based on the strong . The SERS substrate in rough surface metals of gold particles and the laser collide with analytes and enhanced Raman SERS signals recorded by the spectrometer. . between localized surface plasmons and guided modes and manipulate the optical band structure by modifying the thickness of the insulator. . they introduced a new strategy to . The basic procedure for the fabrication of SERS substrates using this technique is as follows: Initially, the substrate is drop coated with nanosphere SiO 2 particles to self-assemble to form a mask on clean conductive ITO substrate or evaporated metal substrate over the glass. Following it, a metal layer of controlled thickness is deposited .
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SERS spectra of 1.5 × 10 –6 M MB molecules on Ti nanorods (a) capped with Ag of 0, 10, 20, 50 and 100 nm in thickness on Ti, (b) capped with Ag of 0, 10, 20, 50 and 100 nm in thickness on Ti .
The measurement of the Ag 3d spectrum of AgNPs from high-resolution XPS to evaluate the environmental test is shown in Figure 6. . A SERS substrate deposited at a 6 nm thickness on glass slides can be prepared by DC sputtering to achieve the characteristics of cost-effectiveness, the required stable deposition rate, high mass production rate .
Raman spectroscopy is a powerful analytical technique widely used for quantitative and qualitative analysis. However, the development of inexpensive, reproducible, and reusable enhancing substrates remains a challenge for material scientists and analytical chemists. In this study, we address this challenge by demonstrating the deposition of core–shell nanoparticles .
To investigate the effect of Au coating thickness on the SERS enhancement, SERS spectra of substrates with different Au coating thickness were measured, as shown in Fig. 4. where I SERS represents the SERS intensity of 4-MBA at the concentration of 10 –6 M (I SERS = 29,301), I Raman represents the normal Raman intensity of 4-MBA at the concentration of 0.1 M (I Raman = 150). N SERS and N Raman denote the adsorbed molecules number on SERS substrate and normal Raman measurement. The spot size could be . The measurement results show that this SERS substrate has a SERS enhancement factor (EF) of up to 2.84 × 10 7, the lowest detectable concentration for 4-ATP of 10 –9 M, and a relative standard deviation (RSD) of . Flexible SERS substrates offer distinct advantages by avoiding the need for . a proliferation of substrate types, and lengthier measurement phases. To navigate around the constraints of narrowband LSPR, innovative approaches have surfaced. . was ascertained using a thickness gauge (547-401, Mitutoyo) and was determined to be less than 10 .
In addition, the precipitation would also reduce the stability of SERS substrates. Therefore, by taking the SERS activity and stability into account, the Au@AgNAs with Au (core) diameter of about 32 nm and Ag (shell) thickness of about 8.5 nm was chosen as the optimal SERS substrate for further study in our experiments. 3.5. While standard addition was previously demonstrated for direct quantification of uric acid 68,69 and moxifloxacin 70 in urine, new SERS substrates were needed for every measurement, generating .
Furthermore, SERS mapping is performed by measuring the SERS spectra of 10 −5 M R6G on the Au-NPs/Si substrate in the 120 × 120 μm 2 area with a step size of 10 μm along the x and y directions, aiming to further characterize the uniformity of the SERS substrate (Fig. S8). The discovery of the enhancement of Raman scattering by molecules adsorbed on nanostructured metal surfaces is a landmark in the history of spectroscopic and analytical techniques. Significant experimental and theoretical effort has been directed toward understanding the surface-enhanced Raman scattering (SERS) effect and demonstrating its .Reliable SERS Substrates Jiaqi Li*ab, Chang Chen*ab, Hilde Jansa, Xiumei Xua, . water before the SERS measurement. The same 10× water immersion objective was used as in reflection measurements. A 785nm diode laser and a He-Ne laser at 632.8nm (~0.5 mW) were . As the sputtered Au layer thickness increases, the gaps between the Au nanocaps .
The integration of plasmonic nanostructures in an optrode sensing system holds significant promise for online and remote detection via surface-enhanced Raman scattering (SERS) method. This study focuses on the impact of the shape and composition of plasmonic materials on their ability to enhance surface-enhanced Raman scattering (SERS) signals. We . 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 . Since the discovery of the phenomenon of surface-enhanced Raman scattering (SERS), it has gradually become an important tool for the analysis of material compositions and structures. The applications of SERS have been expanded from the fields of environmental and materials science to biomedicine due to the extremely high sensitivity and non-destructiveness . TiO2-coated Ag nanorods (Ag@TiO2 NRs) have been fabricated as multifunctional surface-enhanced Raman scattering (SERS) substrates. Uniform TiO2 shells could sufficiently protect the internal Ag .
A rhodamine 6G (R6G) probe molecule is used as the detection agent for the SERS measurement. Different sizes of arrayed micro/nanostructures are fabricated by different treatment time using the electrochemical process. . Choi et al. used a nanoporous template of AAO as a SERS substrate, and varied the thickness of either the Au film or the .
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measuring thickness sers substrates|Dimensional Design for Surface