SERS properties of biogenic gold nanoparticles synthesized using Anemopsis californica extract.

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3397-3406
Author(s):  
R. D. Ávila-Avilés ◽  
Marco A. Camacho-López ◽  
E. Castro-Longoria ◽  
A. Dorazco-González ◽  
N. Hernández-Guerrero ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Signal ◽  
Sers Substrate ◽  
Anemopsis Californica ◽  
Glass Slides ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Biological Methods

AbstractGold nanoparticles (AuNPs) have been classified as one of the most attractive nanotechnologies, thanks to their potential or already implemented applications; therefore, biological methods for their synthesis have been widely investigated. This study explores the synthesis of AuNPs using the extract of Anemopsis californica, and determinates the effect of the solvent used (water, methanol, and isopropanol) to obtain the AuNPs. Biogenic nanoparticles were analysed through UV-Vis spectroscopy and transmission electron microscopy (TEM, HRTEM, and SAED). Significant differences in polydispersity and morphology of AuNPs among the different methods used were found; the aqueous extract and the extract based on methanol formed nanotriangles and polyhedral nanoparticles; the shape of the nanoparticles is predominantly polyhedral when isopropanol is used as the solvent. The as obtained nanoparticles were placed on glass slides to perform Surface-Enhanced Raman Scattering (SERS) experiments, an amplification of the methylene blue Raman signal was observed when triangular nanoparticles cover the biogenic SERS substrate.

Fabrication and Growth Mechanism of Star-Shaped Gold Nanoparticles via Seed-Mediated Growth Method

2010 ◽  
Vol 152-153 ◽  
pp. 600-604
Author(s):  
Hui Juan Wang ◽  
Chen Yang Xue ◽  
Rong Chen ◽  
Wen Dong Zhang
Keyword(s):  
Gold Nanoparticles ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Growth Method ◽  
Enhanced Raman Scattering ◽  
The Mean ◽  
Seed Mediated ◽  
Gold Sphere

In this paper, gold nanoparticles with branches were prepared in aqueous solutions using seed-mediated growth method. The mean diameter of the seeds chosen for these studies is 6~8nm. The influence of reducing agent used in synthesis gold sphere as seeds was investigated. A reaction mechanism of fabrication gold nanostar particles was systematically described. The nanoparticles synthesized were characterized by transmission electron microscopy (TEM) and UV-vis spectroscopy. In order to investigate their optical property, Surface Enhanced Raman Scattering (SERS) spectrums were tested, which showed quite good Raman enhencement.

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.

A sandwich-type surface-enhanced Raman scattering sensor using dual aptamers and gold nanoparticles for the detection of tumor extracellular vesicles

The Analyst ◽  
2020 ◽  
Vol 145 (19) ◽  
pp. 6232-6236
Author(s):  
Min Hou ◽  
Dinggeng He ◽  
Hongchang Bu ◽  
Huizhen Wang ◽  
Jin Huang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Extracellular Vesicles ◽  
Surface Enhanced Raman Scattering ◽  
Raman Signal ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sandwich Type ◽  
Enhanced Raman Scattering

A sandwich-type surface-enhanced Raman scattering (SERS) sensor using dual aptamers and gold-enhanced Raman signal probes has been successfully constructed for the detection of tumor-derived extracellular vesicles.

scholarly journals Bromide-Assisted Anisotropic Growth of Gold Nanoparticles as Substrates for Surface-Enhanced Raman Scattering

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Melissa A. Kerr ◽  
Fei Yan
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Chemical Properties ◽  
Surface Enhanced Raman Scattering ◽  
Synthetic Methods ◽  
Au Nps ◽  
Vis Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We report herein a one-step synthesis of gold nanoparticles (Au NPs) of various shapes such as triangles, hexagons, and semispheres, using 5-hydroxyindoleacetic acid (5-HIAA) as the reducing agent in the presence of potassium bromide (KBr). Anisotropic Au NPs have received ever-increasing attention in various areas of research due to their unique physical and chemical properties. Numerous synthetic methods involving either top-down or bottom-up approaches have been developed to synthesize Au NPs with deliberately varied shapes, sizes, and configurations; however, the production of templateless, seedless, and surfactant-free singular-shaped anisotropic Au NPs remains a significant challenge. The concentrations of hydrogen tetrachloroaurate (HAuCl4), 5-HIAA, and KBr, as well as the reaction temperature, were found to influence the resulting product morphology. A detailed characterization of the resulting Au NPs was performed using ultraviolet-visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and Raman spectroscopy. The as-prepared Au NPs exhibited excellent surface-enhanced Raman scattering (SERS) properties, which make them very attractive for the development of SERS-based chemical and biological sensors.

Surface-enhanced Raman scattering substrate based on cysteamine-modified gold nanoparticle aggregation for highly sensitive pentachlorophenol detection

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 85285-85292 ◽  
Author(s):  
Qian Ma ◽  
Hongyan Zhang ◽  
Weimin Liu ◽  
Jiechao Ge ◽  
Jiasheng Wu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
Nanoparticle Aggregation ◽  
Gold Nanoparticle Aggregation ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A new surface-enhanced Raman scattering (SERS) substrate based on cysteamine-modified gold nanoparticles (AuNPs) on the glass surface has been developed for the monitoring of pentachlorophenol (PCP) in water samples.

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...

scholarly journals Gold nanoparticles fabricated by the electrical wire explosion technique, deposited on a porous silicon as an active substrate for surface-enhanced Raman scattering (SERS)

2021 ◽  
Vol 2114 (1) ◽  
pp. 012094
Author(s):  
Ansam F Jaleel ◽  
Ahmed S Wasfi
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
X Ray Diffraction ◽  
Wire Explosion ◽  
X Ray ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Abstract This study aims to improve the surface-enhanced Raman scattering (SERS) using gold nanoparticles prepared by the wire explosion technique and deposited on an etched silicon substrate. This spectral technique is highly dependent upon physicochemical properties of the substrate material, to detect very low concentrations of the toxic materials. The morphological and structural features of the prepared gold nanoparticles (AuNPs) have been investigated by the field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). The FE-SEM images illustrated that the deposited AuNPs have a non-uniform spherical shape with a rough surface and there were nanogaps between them acting as hotspots at the surface. While the X-ray diffraction pattern indicated the existence of the (111) plane which confirmed the crystalline nature of the AuNPs. Rh6G dye was used as a probe material to examine the performance of these nanoparticles as a SERS substrate. The Raman scattering spectrum of the rhodamine RH6G dye enhanced greatly due to the existence of these nanoparticles, where the enhancement factor (EF) was 2.23×106 when using a deposited AuNPs of concentration 13.46 ppm which is equal to 3×10-5 M, and a reasonable detection limit for a low dye concentration of 10-14M.

scholarly journals Plasmonic Gold Nanoisland Film for Bacterial Theranostics

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3139
Author(s):  
Shih-Hua Tan ◽  
Sibidou Yougbaré ◽  
Hsuan-Ya Tao ◽  
Che-Chang Chang ◽  
Tsung-Rong Kuo
Keyword(s):  
Glass Substrate ◽  
Photothermal Therapy ◽  
Visible Spectrum ◽  
Photothermal Effect ◽  
Raman Signal ◽  
Sers Substrate ◽  
E Coli ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering

Plasmonic nanomaterials have been intensively explored for applications in biomedical detection and therapy for human sustainability. Herein, plasmonic gold nanoisland (NI) film (AuNIF) was fabricated onto a glass substrate by a facile seed-mediated growth approach. The structure of the tortuous gold NIs of the AuNIF was demonstrated by scanning electron microscopy and energy-dispersive X-ray spectroscopy. Based on the ultraviolet-visible spectrum, the AuNIF revealed plasmonic absorption with maximum intensity at 624 nm. With the change to the surface topography created by the NIs, the capture efficiency of Escherichia coli (E. coli) by the AuNIF was significantly increased compared to that of the glass substrate. The AuNIF was applied as a surface-enhanced Raman scattering (SERS) substrate to enhance the Raman signal of E. coli. Moreover, the plasmonic AuNIF exhibited a superior photothermal effect under irradiation with simulated AM1.5 sunlight. For photothermal therapy, the AuNIF also displayed outstanding efficiency in the photothermal killing of E. coli. Using a combination of SERS detection and photothermal therapy, the AuNIF could be a promising platform for bacterial theranostics.

scholarly journals Immobilization and 3D Hot-Junction Formation of Gold Nanoparticles on Two-Dimensional Silicate Nanoplatelets as Substrates for High-Efficiency Surface-Enhanced Raman Scattering Detection

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 324 ◽  
Author(s):  
Yen-Chen Lee ◽  
Chih-Wei Chiu
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
High Efficiency ◽  
Surface Enhanced Raman Scattering ◽  
Detection Sensitivity ◽  
Sers Substrate ◽  
Two Dimensional ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

We synthesize a high-efficiency substrate for surface-enhanced Raman scattering (SERS) measurements, which is composed of gold nanoparticles (AuNPs) on two-dimensional silicate nanoplatelets acting as an inorganic stabilizer, via the in-situ reduction of hydrogen tetrachloroaurate (III) by sodium citrate in an aqueous solution. Silicate platelets of ~1-nm thickness and various sizes, viz. laponite (50 nm), sodium montmorillonite (Na+–MMT, 100 nm), and mica (500 nm), are used to stabilize the AuNPs (Au@silicate), which are formed with uniform diameters ranging between 25 and 30 nm as confirmed by transmission electron microscopy (TEM). In particular, the laponite SERS substrate can be used in biological, environmental, and food safety applications to measure small molecules such as DNA (adenine molecule), dye (Direct Blue), and herbicide (paraquat) as it shows high detection sensitivity with a detection limit of 10−9 M for adenine detection. These highly sensitive SERS substrates, with their three-dimensional hot-junctions formed with AuNPs and two-dimensional silicate nanoplatelets, allow the highly efficient detection of organic molecules. Therefore, these Au@silicate nanohybrid substrates have great potential in biosensor technology because of their environmentally-friendly and simple fabrication process, high efficiency, and the possibility of rapid detection.

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