scholarly journals Surface Enhanced Raman Spectroscopy With Electrodeposited Copper Ultramicro-Wires With/Without Silver Nanostars Decoration

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 518
Author(s):  
Margherita Longoni ◽  
Maria Sole Zalaffi ◽  
Lavinia de Ferri ◽  
Angela Maria Stortini ◽  
Giulio Pojana ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Anodized Aluminum ◽  
Anodized Aluminum Oxide ◽  
Electrochemical Preparation ◽  
Deposition Parameters ◽  
Raman Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Materials Used

The electrochemical preparation of arrays of copper ultramicrowires (CuUWs) by using porous membranes as templates is critically revisited, with the goal of obtaining cheap but efficient substrates for surface enhanced Raman spectroscopy (SERS). The role of the materials used for the electrodeposition is examined, comparing membranes of anodized aluminum oxide (AAO) vs. track-etched polycarbonate (PC) as well as copper vs. glassy carbon (GC) as electrode material. A voltammetric study performed on bare electrodes and potentiostatic tests on membrane coated electrodes allowed the optimization of the deposition parameters. The final arrays of CuUWs were obtained by chemical etching of the template, with NaOH for AAO and CH2Cl2 for PC. After total etching of the template, SERS spectra were recorded on CuUWs using benzenethiol as SERS probe with known spectral features. The CuUW substrates displayed good SERS properties, providing enhancement factor in the 103–104 range. Finally, it was demonstrated that higher Raman enhancement can be achieved when CuUWs are decorated with silver nanostars, supporting the formation of SERS active hot-spots at the bimetallic interface.

HIGH-ORDERED AND ULTRA-SENSITIVE PARTICLE-IN-BOWL METALLIC ARRAYS FOR SURFACE ENHANCED RAMAN SPECTROSCOPY

NANO ◽  
2014 ◽  
Vol 09 (04) ◽  
pp. 1450050 ◽  
Author(s):  
DI DI ◽  
PEITAO DONG ◽  
CHAOGUANG WANG ◽  
JIAN CHEN ◽  
JUNFENG WANG ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Fdtd Method ◽  
Disease Diagnosis ◽  
Surface Enhanced Raman Spectroscopy ◽  
Excitation Wavelength ◽  
Raman Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Em Field ◽  
Lift Off

High-ordered particle-in-bowl (PIB) arrays are developed in this paper for surface enhanced Raman spectroscopy (SERS). A heterogeneous shadow mask, composing of the chrome (Cr) layer and colloid residues, is used to fabricate the silicon ( Si ) template from where the PIB arrays finally lift-off. The finite difference time domain (FDTD) method is employed to investigate the Raman enhancement mechanism of this PIB architecture. The electromagnetic (EM) field tends to concentrate in the gap between the bowl and the particle forming the "hot spots". The enhancement factor (EF) of the EM field is about 70 with an excitation wavelength of 785 nm. The Raman measurements validate the EM calculation of the PIB arrays. The EF is about 1.12 × 107 using Rodamine 6G (R6G) as probe molecule. The proposed PIB array is high-ordered in morphology and ultra-sensitive in Raman measurement, providing an ideal substrate for SERS-based bio-chemical sensing, disease diagnosis and analytical chemistry.

scholarly journals Spray-Drying-Based Surface-Enhanced Raman Spectroscopy: Effect of the Silver Nanoparticle Aggregate Size on the Enhancement of Raman Scattering

2021 ◽  
Author(s):  
Chigusa Matsumoto ◽  
Masao Gen ◽  
Atsushi Matsuki ◽  
Takafumi Seto
Keyword(s):  
Raman Spectroscopy ◽  
Spray Drying ◽  
Silver Nanoparticle ◽  
Hot Spots ◽  
Aggregate Size ◽  
Surface Enhanced Raman Spectroscopy ◽  
Probe Molecules ◽  
Raman Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Abstract We report a spray-drying method to fabricate silver nanoparticle (AgNP) aggregates for application in surface-enhanced Raman spectroscopy (SERS). A custom-built system was used to fabricate AgNP aggregates of three sizes, 48, 86, and 218 nm, from drying droplets containing AgNPs atomized from an AgNP suspension. Sample solutions of Rhodamine B (RhB) at 10–6, 10–8, and 10–10 M concentrations were dropped onto the AgNP aggregates as probe molecules to examine the enhancement of the Raman signals of the RhB. The ordering of the analytical enhancement factors (AEFs) by aggregate size at a given RhB concentration was 86 nm > 218 nm > 48 nm. The AEFs of the 86 nm AgNP aggregates were higher than those of the 218-nm aggregates, although the 218-nm aggregates had more hot spots where Raman enhancement occurred. This finding was attributable to the deformation and damping of the electron cloud in the highly aggregated AgNPs, reducing the sensitivity for Raman enhancement. When RhB was premixed with the AgNP suspension prior to atomization, the AEFs at 10–8 M RhB rose ~100-fold compared to those in the earlier experiments (the post-dropping route). This significant enhancement was probably caused by the increased opportunity for the trapping of the probe molecules in the hot spots.

scholarly journals A Review on Applications of Two-Dimensional Materials in Surface-Enhanced Raman Spectroscopy

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Ming Xia
Keyword(s):  
Raman Spectroscopy ◽  
2D Materials ◽  
Surface Enhanced Raman Spectroscopy ◽  
Great Promise ◽  
Two Dimensional ◽  
Raman Enhancement ◽  
Two Dimensional Materials ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Recent Developments

Two-dimensional (2D) materials, such as graphene and MoS2, have been attracting wide interest in surface enhancement Raman spectroscopy. This perspective gives an overview of recent developments in 2D materials’ application in surface-enhanced Raman spectroscopy. This review paper focuses on the applications of using bare 2D materials and metal/2D material hybrid substrate for Raman enhancement. The Raman enhancing mechanism of 2D materials will also be discussed. The progress covered herein shows great promise for widespread adoption of 2D materials in SERS application.

scholarly journals Surface-Enhanced Raman Spectroscopy Based on a Silver-Film Semi-Coated Nanosphere Array

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3966 ◽  
Author(s):  
Wending Zhang ◽  
Tianyang Xue ◽  
Lu Zhang ◽  
Fanfan Lu ◽  
Min Liu ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Substrate ◽  
Thermal Evaporation Method ◽  
Raman Enhancement ◽  
Target Analytes ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Difference Time ◽  
Ag Film

In this paper, we present a convenient and economical method to fabricate a silver (Ag)-film semi-coated polystyrene (PS) nanosphere array substrate for surface-enhanced Raman spectroscopy (SERS). The SERS substrate was fabricated using the modified self-assembled method combined with the vacuum thermal evaporation method. By changing the thickness of the Ag film, the surface morphology of the Ag film coated on the PS nanospheres can be adjusted to obtain the optimized localized surface plasmonic resonance (LSPR) effect. 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 Raman examination results show that the SERS substrate has excellent reliability and sensitivity using rhodamine-6G (R6G) and rhodamine-B (RB) as target analytes, and the Raman sensitivity can reach 10−10 M. Meanwhile, the SERS substrate has excellent uniformity based on the Raman mapping result. The Raman enhancement factor of the SERS substrate was estimated to be 5.1 × 106. This kind of fabrication method for the SERS substrate may be used in some applications of Raman examination.

scholarly journals Cyclodextrin-assisted surface-enhanced Raman spectroscopy: a critical review

2021 ◽  
Author(s):  
Natalia E. Markina ◽  
Dana Cialla-May ◽  
Alexey V. Markin
Keyword(s):  
Raman Spectroscopy ◽  
Molecularly Imprinted Polymers ◽  
Surface Enhanced Raman Spectroscopy ◽  
Experimental Investigations ◽  
Real Potential ◽  
Sers Substrates ◽  
Raman Enhancement ◽  
Surface Enhanced ◽  
Physicochemical Studies ◽  
Surface Enhanced Raman

AbstractNumerous approaches have been proposed to overcome the intrinsically low selectivity of surface-enhanced Raman spectroscopy (SERS), and the modification of SERS substrates with diverse recognition molecules is one of such approaches. In contrast to the use of antibodies, aptamers, and molecularly imprinted polymers, application of cyclodextrins (CDs) is still developing with less than 100 papers since 1993. Therefore, the main goal of this review is the critical analysis of all available papers on the use of CDs in SERS analysis, including physicochemical studies of CD complexation and the effect of CD presence on the Raman enhancement. The results of the review reveal that there is controversial information about CD efficiency and further experimental investigations have to be done in order to estimate the real potential of CDs in SERS-based analysis. Graphical abstract

An ordered mesoporous Ag superstructure synthesized via a template strategy for surface-enhanced Raman spectroscopy

Nanoscale ◽  
2015 ◽  
Vol 7 (29) ◽  
pp. 12318-12324 ◽  
Author(s):  
Cuifeng Tian ◽  
Jiang Li ◽  
Chunsheng Ma ◽  
Ping Wang ◽  
Xiaohong Sun ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Uniform Distribution ◽  
Surface Enhanced Raman Spectroscopy ◽  
Raman Enhancement ◽  
Ordered Mesoporous ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Ordered mesoporous Ag superstructure was synthesized by means of a nanocasting process. The nanowire bundled superstructure shows uniform distribution of small nanogap size down to ∼2 nm, thus exhibits ultrahigh Raman enhancement.

Surface-Enhanced Raman Spectroscopy of Two-Dimensional Tin Diselenide Nanoplates

2018 ◽  
Vol 72 (11) ◽  
pp. 1613-1620 ◽  
Author(s):  
Mei Liu ◽  
Ying Shi ◽  
Guangping Zhang ◽  
Yongheng Zhang ◽  
Meimei Wu ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Charge Transfer ◽  
Optoelectronic Device ◽  
Surface Enhanced Raman Spectroscopy ◽  
Raman Signal ◽  
Two Dimensional ◽  
Raman Enhancement ◽  
Surface Enhanced ◽  
Device Integration ◽  
Surface Enhanced Raman

Surface-enhanced Raman spectroscopy (SERS) is a powerful spectroscopy technique to detect and characterize molecules at a very low concentration level. The two-dimensional (2D) semi-conductor layered material, tin diselenide (SnSe2), is used as a new substrate for enhancing the Raman signals of adsorbed molecules. Three kinds of molecules—Rhodamine 6G (R6G), crystal violet (CV), and methylene blue (MB)—are used as probe molecules to evaluate the SERS performance of SnSe2. The Raman signals of different molecules can be enhanced by SnSe2 nanoplates (NPs). The distinguishable Raman signal of R6G molecules can be obtained for adsorbent concentrations as low as 10−17 mol/L. Based on a detailed analysis of the bandgap structure and opto-electrical properties of SnSe2 NPs, we discuss the process of charge transfer and the Raman enhancement mechanism of SnSe2 NP. The high Raman sensitivity of SnSe2 NPs is related to the charge transfer between molecules and SnSe2, 2D layered structure, and indirect bandgap of few-layered SnSe2. The research results will help to expand the application of SnSe2 in microanalysis, improve the measurement accuracy of SERS, and possibly find use in optoelectronic device integration.

scholarly journals Spatial-Tunable Au Nanoparticle Functionalized Si Nanorods Arrays for Surface Enhanced Raman Spectroscopy

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1317
Author(s):  
Dongdong Lin ◽  
Kunjie Dai ◽  
Tianxiang Yu ◽  
Wenhui Zhao ◽  
Wenwu Xu
Keyword(s):  
Raman Spectroscopy ◽  
Incident Light ◽  
High Sensitivity ◽  
Surface Enhanced Raman Spectroscopy ◽  
Au Nanoparticle ◽  
Spatial Uniformity ◽  
Raman Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Difference Time

In this study, hexagonal-packed Si nanorods (SiNRs) arrays were fabricated and conjugated with Au nanoparticles (AuNPs) in different spatial distributions for surface-enhanced Raman spectroscopy (SERS). The AuNPs were functionalized on the bottom of SiNRs (B-SiNRs@AuNPs), top of SiNRs (T-SiNRs@AuNPs) and sides of SiNRs (S-SiNRs@AuNPs), respectively. Our results demonstrated that the SiNRs conjugated with AuNPs on the sides achieved high reproducibility in detection of R6G molecules, while the AuNPs on the top of the SiNRs obtained the strongest Raman enhancement. In addition, the substrate with S-SiNRs@AuNPs obtained the highest spatial uniformity of enhancement. The finite-difference time-domain simulation gave further evidence that the incident light could be confined in the space of SiNRs arrays and yield a zero-gap enhancement coupled with the AuNPs. Our study provided a spatially tunable SiNRs@AuNPs substrate with high sensitivity and reproducibility in molecular detection.

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