scholarly journals Preparation of ZnO nanoflowers for surface enhance Raman scattering applications

2020 ◽  
Vol 36 (1) ◽  
Author(s):  
Tuyen Nguyen Viet
Keyword(s):  
Raman Scattering ◽  
Self Assembly ◽  
Noble Metals ◽  
Zno Nanorods ◽  
Raman Signal ◽  
Sers Substrate ◽  
Chemical Substances ◽  
Sers Substrates ◽  
Electromagnetic Enhancement ◽  
Surface Enhanced Raman

Thanks to unique Raman spectra of chemical substances, a growing number of applications in environmental and biomedical fields based on Raman scattering has been developed. However, the low probability of Raman scattering hindered its potential development and thus, many different techniques were developed to enhance Raman signal. A key step of surface-enhanced Raman scattering technique is to prepare active SERS substrate from noble metals. The main enhancement mechanism is electromagnetic enhancement resulted from surface plasmon resonance. The disadvantages of nanoparticles based SERS substrates include high randomness due to self - assembly process of nanoparticles. Recently, a new kind of SERS substrates with order nanostructures of semiconductors combining with noble metals can serve as active SERS substrates, which are expected to possess high enhancement of Raman signals. In this study, ordered ZnO nanorods were first prepared by galvanic hydrothermal method and gold was sputtered on the as prepared ZnO nanomaterials to enhance Raman. Our SERS substrates exhibit promising high enhancement factors, and can detect chemical substances at concentration in nano molar range.

Multi-branched gold nanoparticles for Surface Enhanced Raman scattering characterization

2014 ◽  
Vol 1625 ◽  
Author(s):  
Jencilin Johnston ◽  
Erik N. Taylor ◽  
Richard J. Gilbert ◽  
Thomas J. Webster
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Noble Metals ◽  
Fluorescent Dyes ◽  
Synthesis Method ◽  
Surface Enhanced Raman Scattering ◽  
Raman Signal ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

ABSTRACTSurface enhanced Raman scattering (SERS) is a sensitive and reproducible vibrational spectroscopic technique used to detect and characterize molecules near the surface of noble metals like Au, Ag, Pt, Cu, etc. SERS enhances Raman signals through light-induced plasmonic vibrations occurring on irregular metal surfaces and localized electromagnetic augmentation. To better define nano-scale regions of the Raman signal enhancement, we generated gold nanoparticles with a unique multi-branched configuration along with surface-adsorbed fluorescent reporter molecules. The reporter molecules included a set of near-infra red active fluorescent dyes IR820 (green cyanine, photo electronic dye), DTTC (3, 3'-diethylthiatricarbocyanine iodide) and DTDC (3, 3'- diethylthiadicarbocyanine iodide). We employed a one-pot synthesis method in order to generate a stellate configuration in gold nanoparticles through the reduction of HAuCl4 with Good’s buffer, HEPES, at pH 7.4 and room temperature. A cell viability assay was performed with normal esophageal cells exposed to the multi-branched gold nanoparticles and SERS molecules to assess their toxicity. Our results demonstrate the capacity of multibranched gold nanoparticles linked to Raman reporter molecules to generate distinct signature spectra and, with the exception of the gold nanoparticles functionalized with DTTC, remain non-toxic to normal esophageal cells.

scholarly journals Synthesis and surface-enhanced Raman scattering of indium nanotriangles and nanowires

RSC Advances ◽  
2017 ◽  
Vol 7 (51) ◽  
pp. 32255-32263 ◽  
Author(s):  
Rupali Das ◽  
R. K. Soni
Keyword(s):  
Raman Scattering ◽  
Reduction Method ◽  
Surface Enhanced Raman Scattering ◽  
Resonant Excitation ◽  
Raman Signal ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Nano Wires

Indium nano-wires and -triangles are synthesizedviaa modified polyol reduction method and self-assembled on silane treated glass coverslips as SERS substrates, giving large Raman signal enhancement from adsorbed tryptophan molecules under non-resonant excitation at 632.8 nm.

Large Area Au Decorated Multi-Walled CNTs Film for Surface Enhanced Raman Scattering

2013 ◽  
Vol 562-565 ◽  
pp. 826-831 ◽  
Author(s):  
Jie Zhang ◽  
Yu Lin Chen ◽  
Tuo Fan ◽  
Yong Zhu
Keyword(s):  
Raman Scattering ◽  
Resonance Effect ◽  
Surface Enhanced Raman Scattering ◽  
Fine Tuning ◽  
Sers Substrate ◽  
Large Area ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We reported on a study upon a Surface-enhanced Raman Scattering (SERS) substrate produced from a large area multi-walled carbon nanotube (MWCNT) films decorated with Au nanoparticles. The morphology and spectrum of the MWCNTs/Au composite structure was characterized with scanning electron microscopy and spectrophotometer. The SERS signals of Rhodamine 6G (R6G) absorbed on the substrate were improved, which could contribute to the enlarged surface area for adsorption of molecules and Localized Plasmon Resonance Effect. The results indicated that it is potential to produce sensitive SERS substrates via further fine-tuning of size, shape of the nanostructure.

scholarly journals Genetic Algorithm-Driven Surface-Enhanced Raman Spectroscopy Substrate Optimization

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2905
Author(s):  
Buse Bilgin ◽  
Cenk Yanik ◽  
Hulya Torun ◽  
Mehmet Cengiz Onbasli
Keyword(s):  
Genetic Algorithm ◽  
Raman Spectroscopy ◽  
Strong Electric Field ◽  
Surface Enhanced Raman Spectroscopy ◽  
Raman Signal ◽  
Sers Substrate ◽  
Design Constraints ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive and molecule-specific detection technique that uses surface plasmon resonances to enhance Raman scattering from analytes. In SERS system design, the substrates must have minimal or no background at the incident laser wavelength and large Raman signal enhancement via plasmonic confinement and grating modes over large areas (i.e., squared millimeters). These requirements impose many competing design constraints that make exhaustive parametric computational optimization of SERS substrates prohibitively time consuming. Here, we demonstrate a genetic-algorithm (GA)-based optimization method for SERS substrates to achieve strong electric field localization over wide areas for reconfigurable and programmable photonic SERS sensors. We analyzed the GA parameters and tuned them for SERS substrate optimization in detail. We experimentally validated the model results by fabricating the predicted nanostructures using electron beam lithography. The experimental Raman spectrum signal enhancements of the optimized SERS substrates validated the model predictions and enabled the generation of a detailed Raman profile of methylene blue fluorescence dye. The GA and its optimization shown here could pave the way for photonic chips and components with arbitrary design constraints, wavelength bands, and performance targets.

Nanoscale engineering of ring-mounted nanostructure around AAO nanopores for highly sensitive and reliable SERS substrates

2021 ◽  
Author(s):  
Jun Dong ◽  
Yan Wang ◽  
Qianying Wang ◽  
Yi Cao ◽  
qingyan han ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Self Assembly ◽  
High Efficiency ◽  
Low Cost ◽  
Sers Substrate ◽  
Two Phase ◽  
Local Surface Plasmon Resonance ◽  
Sers Substrates ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Abstract Surface-enhanced Raman scattering (SERS) is recognized as one of the most favored techniques for enhancing Raman signals. The morphology of the SERS substrate profoundly affects molecular Raman spectra. This study aimed to construct a ring-mounted nanostructured substrate via liquid–liquid two-phase self-assembly (LLSA) incorporated with anodic aluminum oxide (AAO) membrane transfer techniques. High-density nanoparticles (NPs) assembled on AAO membranes were ascribed to reduce the diameters of the nanopores, with Au–Ag alloy NPs to regulate the dielectric constant so as to reveal the local surface plasmon resonance tunability. SERS engineered in this way allowed for the fabrication of a ring-mounted nanostructured substrate where the distribution density of NPs and dielectric constant could be independently fine-tuned. High SERS activity of the substrate was revealed by detecting the enhanced factor of crystal violet and rhodamine 6G molecules, which was up to 1.56 × 106. Moreover, SERS of thiram target molecules confirmed the supersensitivity and repeatability of the substrate as a practical application. The results of this study manifested a low-cost but high-efficiency ring-mounted nanostructured SERS substrate that might be suitable in many fields, including biosensing, medical research, environmental monitoring, and optoelectronics.

scholarly journals Preparation of Self-Assembled Composite Films Constructed by Chemically-Modified MXene and Dyes with Surface-Enhanced Raman Scattering Characterization

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 284 ◽  
Author(s):  
Kaiyue Chen ◽  
Xiaoya Yan ◽  
Junkai Li ◽  
Tifeng Jiao ◽  
Chong Cai ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Self Assembly ◽  
Composite Films ◽  
Surface Enhanced Raman Scattering ◽  
Sulfanilic Acid ◽  
Bulk Solution ◽  
Sers Substrate ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The effective functionalization and self-assembly of MXene are of crucial importance for a broad range of nanomaterial applications. In this work, we investigated the aggregates of sulfanilic acid-modified MXene (abbreviated as MXene-SO3H) with three model dyes at the air–water interface and demonstrated the morphological and aggregation changes of composite films, using Langmuir-Blodgett (LB) technology, as well as excellent uniformity and reproducibility by using surface-enhanced Raman scattering (SERS) spectra. This research has found that cationic dye molecules were adsorbed onto negatively charged MXene-SO3H particles mainly through electrostatic interaction and the particles induced dyes to form highly ordered nanostructures including H- and/or J-aggregates corresponding to monomers in bulk solution. The surface pressure-area isotherms from different dye sub phases confirmed that the stable composite films have been successfully formed. And the spectral results reveal that different dyes have different types of aggregations. In addition, the SERS spectra indicated that the optimal layers of MXene-SO3H/methylene blue (MB) films was 50 layers using rhodamine 6G (R6G) as probe molecule. And the formed 50 layers of MXene-SO3H/MB films (MXene-SO3H/MB-50) as SERS substrate were proved to possess excellent uniformity and repeatability.

scholarly journals Synthesis of Gold Nanoparticle Stabilized on Silicon Nanocrystal Containing Polymer Microspheres as Effective Surface-Enhanced Raman Scattering (SERS) Substrates

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1501
Author(s):  
Guixian Zhu ◽  
Lin Cheng ◽  
Gannan Liu ◽  
Lianqing Zhu
Keyword(s):  
Raman Scattering ◽  
Metal Nanoparticles ◽  
Hot Spots ◽  
Sers Substrate ◽  
Silicon Nanocrystal ◽  
Biological Detection ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Developing ideal surface-enhanced Raman scattering (SERS) substrates is significant in biological detection. Compared with free non-aggregated noble metal nanoparticles, loading metal nanoparticles on a large matrix can achieve a higher SERS effect due to the existence of many “hot spots”. A novel SERS substrate with intense “hot spots” was prepared through reducing gold ions with silicon nanocrystal containing polymer microspheres. The substrate exhibits high SERS sensitivity with an enhancement factor of 5.4 × 107. By applying 4-mercaptopyridine as a Raman reporter, the developed SERS substrate can realize measurement of pH values. The intensity ratio of 1574 to 1607 cm−1 of 4-mercaptopyridine showed excellent pH sensitivity, which increased as the surrounding pH increased. With good stability and reliability, the pH sensor is promising in the design of biological detection devices.

scholarly journals Preparation of Fe3O4@PDA@Au@GO Composite as SERS Substrate and Its Application in the Enrichment and Detection for Phenanthrene

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 128
Author(s):  
Junyu Liu ◽  
Yiwei Liu ◽  
Yida Cao ◽  
Shihua Sang ◽  
Liang Guan ◽  
...  
Keyword(s):  
Surface Enhanced Raman Spectroscopy ◽  
Raman Signal ◽  
Sers Substrate ◽  
Visible Absorption ◽  
Highly Active ◽  
Electromagnetic Enhancement ◽  
Surface Enhanced Raman ◽  
Active Substrate ◽  
Polycyclic Aromatic ◽  
Sers Active Substrate

In this study, highly active Fe3O4@PDA@Au@GO surface-enhanced Raman spectroscopy (SERS) active substrate was synthesized for application in the enrichment and detection of trace polycyclic aromatic hydrocarbons (PAHs) in the environment. The morphology and structure were characterized by transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD) and UV–visible absorption spectrum (UV–vis spectra). The effect of each component of Fe3O4@PDA@Au@GO nanocomposites on SERS was explored, and it was found that gold nanoparticles (Au NPs) are crucial to enhance the Raman signal based on the electromagnetic enhancement mechanism, and apart from enriching the PAHs through π–π interaction, graphene oxide (GO) also generates strong chemical enhancement of Raman signals, and polydopamine (PDA) can prevent Au from shedding and agglomeration. The existence of Fe3O4 aided the quick separation of substrate from the solutions, which greatly simplified the detection procedure and facilitated the reuse of the substrate. The SERS active substrate was used to detect phenanthrene in aqueous solution with a detection limit of 10−7 g/L (5.6 × 10−10 mol/L), which is much lower than that of ordinary Raman, it is promising for application in the enrichment and detection of trace PAHs.

Surface-Enhanced Raman Scattering Spectra of Non-Fluorescent 4-Mercaptobenzoic Acid and Human Red Blood Cells on Carnation-Shaped Silver Meso-Flowers Monolayer

2020 ◽  
Vol 15 (11) ◽  
pp. 1356-1363
Author(s):  
Shuang-Mei Zhu ◽  
Xi-Guang Dong ◽  
Er-Jun Liang ◽  
Hong-Wei Hou ◽  
Hao-Shan Hao ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
Sers Substrates ◽  
Sensing Applications ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The development of new surface-enhanced Raman scattering (SERS) substrates is primarily motivated by designing synthetic substrates to obtain the significant signal enhancement. In this paper, a large-scale carnation-shaped Ag meso-flowers monolayer with sufficient “hot spots” has been synthesized on copper foil without using any capping agent. In dimethyl sulfoxide, AgNO3 is reduced by Cu for 60 min at 35 °C through the galvanic displacement reaction, and carnation-shaped Ag meso-flowers with good crystallinity and high purity are obtained. The as-fabricated carnation-shaped Ag meso-flowers monolayer is used as novel SERS substrates. Non-fluorescent 4-mercaptobenzoic acid is selected as the probe molecule to test the SERS activity, uniformity and enhancement factors (EF) of the monolayer. Experimental results show that the EF of the carnation-shaped Ag meso-flowers monolayer is up to 7.06×108 and the limit of detection is 10-11 M. Meanwhile, the biocompatibility of the carnation-shaped silver meso-flowers monolayer is tested for red blood cells detection. SERS measurements demonstrate that the carnation-shaped silver meso-flowers monolayer has good activity, uniformity and biocompatibility, and can be used as an outstanding SERS substrate, which has a broad application prospect in numerous chemical and biochemical sensing applications.

A universal strategy for the incorporation of internal standards into SERS substrate to improve the reproducibility of Raman signal

The Analyst ◽  
2021 ◽  
Author(s):  
Binyong Lin ◽  
Yuanyuan Yao ◽  
Yueliang Wang ◽  
Palanisamy Kannan ◽  
Lifen Chen ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Influencing Factor ◽  
Raman Signal ◽  
Sers Substrate ◽  
Internal Standards ◽  
Sers Substrates ◽  
The Poor ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The uneven distribution of metal nanoparticles is a vital influencing factor in the poor uniformity of Surface-enhanced Raman scattering (SERS) substrates, which is a challenge in SERS quantitative analysis. Recent...

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