Coating Ag on an Anatase TiO2 Surface and Adsorption on a 3-Aminopropyltrimethoxysilane-Modified Al or Glass Surface

In this study, Ag–TiO2 was synthesized by reducing AgNO3. AgNO3 and anatase TiO2 nanoparticles (NPs) were boiled with sodium citrate, resulting in the reduction of Ag. Ag was used to coat the anatase TiO2 NP surfaces. At this stage, the assembly reaction on the anatase TiO2 surface was incomplete. The acidity with pH 4 or less was subsequently adjusted using dilute HCl. After processing, Ag was distributed over the entire surface of anatase TiO2. Furthermore, the synthesized Ag–TiO2 could be adsorbed on an Al or glass surface using 3-aminopropyltrimethoxysilane. Al plates were used to create a substrate exhibiting surface-enhanced Raman scattering activity, and Raman intensity was measured for pyridine. Ag remained stable on the TiO2 surface for over five months. The proposed method, which is cost effective and simple, can be used to prepare materials for studying the environment and so on.

Ag-coated 3D cu(OH)2 nanowires on the woven copper mesh as a cost-effective surface-enhanced Raman scattering substrate

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2021.127132 ◽

2021 ◽

pp. 127132

Author(s):

Ningning Zhou ◽

Guowen Meng ◽

Zhulin Huang ◽

Xiang Zhang ◽

Chuhong Zhu ◽

...

Keyword(s):

Raman Scattering ◽

Cost Effective ◽

Effective Surface ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Copper Mesh

Ultrasensitive surface-enhanced Raman scattering detection of urea by highly ordered Au/Cu hybrid nanostructure arrays

Chemical Communications ◽

10.1039/c7cc03523c ◽

2017 ◽

Vol 53 (56) ◽

pp. 7949-7952 ◽

Cited By ~ 9

Author(s):

Kun Chen ◽

Xinyi Zhang ◽

Douglas R. MacFarlane

Keyword(s):

Raman Scattering ◽

Cost Effective ◽

Simple Approach ◽

Hybrid Nanostructure ◽

Highly Sensitive ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Nanostructure Arrays ◽

We report a simple approach to fabricate cost-effective and highly sensitive surface-enhanced Raman scattering substrates based on Au/Cu hybrid nanostructure arrays for the detection of urea, an important molecule in biological and medical fields.

Surface-Enhanced Raman Scattering Determination of Trace Phenanthroline Using Aggregated-Nanosilver as Substrate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.788.15 ◽

2013 ◽

Vol 788 ◽

pp. 15-18

Author(s):

Mao Hui Hu ◽

Ai Hui Liang

Keyword(s):

Raman Scattering ◽

Sodium Borohydride ◽

Sodium Citrate ◽

Buffer Solution ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Sers Intensity

Using PEG10000 and sodium citrate as stabilizer, sodium borohydride as reducing agent, a stable nanosilver sol had been prepared. In pH 6.0 Na2HPO4- NaH2PO4buffer solution and in the presence of NaCl, a stable nanosilver aggregates were formed. Phenanthroline (Phen) adsorbed on the aggregated-nanosilver surfaces resulting in a surface-enhanced Raman scattering (SERS) peak at 1450 cm-1observed, and the SERS intensity was enhanced with the concentration of Phen was between 1.25×10-10mol/L and 2.5×10-9mol/L. Based on these, a new sensitive SERS method has been proposed for the determination of trace Phen in the synthesis of samples, with satisfactory results.

On-demand nanoparticle-on-mirror (NPoM) structure for cost-effective surface-enhanced Raman scattering substrates

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2021.120193 ◽

2021 ◽

pp. 120193

Author(s):

Puspendu Barik ◽

Saptarshi Pal ◽

Manik Pradhan

Keyword(s):

Raman Scattering ◽

Cost Effective ◽

Effective Surface ◽

On Demand ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Surface-Enhanced Raman Scattering: A Technique of Choice for Molecular Detection

Materials Science Forum ◽

10.4028/www.scientific.net/msf.754.143 ◽

2013 ◽

Vol 754 ◽

pp. 143-169 ◽

Cited By ~ 8

Author(s):

Mohammad Kamal Hossain

Keyword(s):

Raman Scattering ◽

Cost Effective ◽

Localized Surface Plasmon ◽

Raman Signal ◽

Wide Range ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Effective Development

Although surface-enhanced Raman scattering (SERS) has crossed its infancy long ago, it is yet to persuade different challenges to make it available in day-to-day applications. SERS is being criticized mainly due to the quality of the SERS analyses that uses substrates to get the giant enhancement for respective Raman signal of the target molecule. Hence, understanding the phenomena behind substrates, cost-effective development and optimization of such substrates for routine analytical purposes and utilization of modern modalities to get the insights out has become a very wide-spreading and interesting area of research. In this piece of work, several key terminologies related to SERS have been presented in brief. Since SERS is a localized surface plasmon resonance (LSPR) mediated signal-enhancing phenomena, it is indispensable to understand the correlation between LSPR excitations originated from substrate and SERS signal originated from molecules. A wide range of SERS-active substrates including scattered nanoaggregates, anisotropic assembly, two-dimensional nanostructure, multi-layered nanostructure of gold nanoparticles and colloidal approach have been used to interpret such correlation between LSPR excitations and SERS characteristics. Few exemplary applications of SERS have been also mentioned followed by typical simulative work how nanoobject behaves at different excitations and polarizations.

Stable in Biocompatible Buffers Silver Nanoisland Films for SERS

Biosensors ◽

10.3390/bios11110448 ◽

2021 ◽

Vol 11 (11) ◽

pp. 448

Author(s):

Alexey Skvortsov ◽

Ekaterina Babich ◽

Alexey Redkov ◽

Andrey Lipovskii ◽

Valentina Zhurikhina

Keyword(s):

Silver Nanoparticles ◽

Glass Surface ◽

Phosphate Buffer ◽

Biological Studies ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

The Stability ◽

First Time ◽

Biosensor Applications

We investigated the stability of silver nanoisland films, which were formed on glass surface by the method of out-diffusion, in biocompatible buffers and the applicability of the films in surface enhanced Raman scattering (SERS). We have shown that silver nanoisland films are stable in one of the most widespread in biological studies buffer—phosphate buffer saline (PBS), and in 1:100 water-diluted PBS, in the PBS-based buffer, in which NaCl is replaced by the same amount of NaClO4, and in acidic phosphate buffer. At the same time, the replacement of NaCl in PBS by N(CH3)4Cl leads to the degradation of the nanoislands. It was shown that after exposure to PBS the nanoisland films provided a good SERS signal from a monolayer of 1,2-di(4-pyridyl)ethylene (BPE), which makes silver nanoisland films promising for biosensor applications. Additionally, in our experiments, we registered for the first time that silver nanoparticles formed in the bulk of the samples dissolved after exposing to PBS, while nanoislands on the glass surface stayed unchanged. We associate this phenomenon with the interaction of ions contained in PBS solution with silver, which results in the shift of corresponding chemical equilibrium.

Hexagonal arrays of plasmonic gold nanopyramids on flexible substrates for surface-enhanced Raman scattering

Nanotechnology ◽

10.1088/1361-6528/ac3579 ◽

2021 ◽

Author(s):

P. Christian Simo ◽

Florian Laible ◽

Anke Horneber ◽

Claus J Burkhardt ◽

Monika Fleischer

Keyword(s):

Raman Scattering ◽

Flexible Substrate ◽

Mechanical Strain ◽

Cost Effective ◽

Gold Thin Film ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Hexagonal Arrays

Abstract Surface-enhanced Raman scattering (SERS) with pyramidal nanostructures increases the signal of Raman active analytes, since hotspots form at the edges and tip of a nano-pyramid under illumination. 2D hexagonal arrays of pyramidal nanostructures with a quadratic base are fabricated through cost-effective nano-sphere lithography and transferred onto elastomeric polydimethylsiloxane (PDMS). By making use of the {111} crystal plane of a silicon (100) wafer, an inverted pyramidal array is etched, which serves as the complementary negative for the gold nanostructures. Either a continuous gold thin-film with protruding pyramids or separate isolated nano-pyramids are produced. Three main fabrication strategies are presented, in which a linker molecule between the PDMS and the gold is mandatory to increase the weak Au-PDMS adhesion. 3-Mercaptopropyltriethoxysilane (MPTS) is able to bind to both PDMS and to the gold structures, thus strongly increasing stability under mechanical strain. The SERS enhancement is verified by Raman mapping of 4-mercaptobenzoic acid (4-MBA) molecules. Fabrication on a flexible substrate paves the way for future applications on curved surfaces or insitu tunable resonances.

Microfluidic setup for on-line SERS monitoring using laser induced nanoparticle spots as SERS active substrate

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.8.26 ◽

2017 ◽

Vol 8 ◽

pp. 237-243 ◽

Cited By ~ 7

Author(s):

Oana-M Buja ◽

Ovidiu D Gordan ◽

Nicolae Leopold ◽

Andreas Morschhauser ◽

Jörg Nestler ◽

...

Keyword(s):

Sodium Citrate ◽

Sers Substrate ◽

Gold Chloride ◽

Glass Capillary ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Active Substrate ◽

On Line ◽

Sers Active Substrate

A microfluidic setup which enables on-line monitoring of residues of malachite green (MG) using surface-enhanced Raman scattering (SERS) is reported. The SERS active substrate was prepared via laser induced synthesis of silver or gold nanoparticles spot on the bottom of a 200 μm inner dimension glass capillary, by focusing the laser beam during a continuous flow of a mixture of silver nitrate or gold chloride and sodium citrate. The described microfluidic setup enables within a few minutes the monitoring of several processes: the synthesis of the SERS active spot, MG adsorption to the metal surface, detection of the analyte when saturation of the SERS signal is reached, and finally, the desorption of MG from the spot. Moreover, after MG complete desorption, the regeneration of the SERS active spot was achieved. The detection of MG was possible down to 10−7 M concentration with a good reproducibility when using silver or gold spots as SERS substrate.

Study of Diluted Meldonium Solutions by Surface Enhanced Raman Scattering Spectroscopy

International Journal of Nanoscience ◽

10.1142/s0219581x19400544 ◽

2019 ◽

Vol 18 (03n04) ◽

pp. 1940054

Author(s):

N. Khinevich ◽

S. Zavatski ◽

H. Bandarenka ◽

V. Belyatsky ◽

E. Galyuk ◽

...

Keyword(s):

Porous Silicon ◽

Raman Scattering ◽

Chemical Mechanism ◽

Raman Intensity ◽

Raman Scattering Spectroscopy ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Active Substrate ◽

Silvered porous silicon was utilized as an active substrate for a detection of small amounts of meldonium by surface enhanced Raman scattering (SERS) spectroscopy. We were able to detect the meldonium in its water solutions at the concentrations of 10[Formula: see text]–10[Formula: see text][Formula: see text]M. Immersion of the silvered porous silicon in the meldonium solutions at the 10[Formula: see text][Formula: see text]M concentration and lower led to the dimers’ formation. At the concentrations larger than 10[Formula: see text][Formula: see text]M, a greater contribution to the enhancement of the Raman intensity was caused by a chemical mechanism while the smaller amounts were detected mostly due to an electromagnetic mechanism.

Stabilizing Ag Nanoparticles Using Anatase TiO2 and Cu on Al Surface

Asian Journal of Physical and Chemical Sciences ◽

10.9734/ajopacs/2020/v8i430123 ◽

2020 ◽

pp. 22-30

Author(s):

Masayoshi Kaneko

Keyword(s):

Ag Nanoparticles ◽

Au Nanoparticles ◽

Active Surface ◽

Anatase Tio2 ◽

Sers Substrate ◽

Ag Nps ◽

Au Nps ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

Chemical adsorption of anatase TiO2, silver nanoparticles (Ag NPs), and Cu particles (Cu Ps) on aluminum (Al) surface yielded an active surface-enhanced Raman scattering (SERS) substrate. TiO2 is known to reduce both silver (Ag) and copper (Cu). In an oxidizing environment, Ag NPs remain unoxidized since Cu has a more negative redox potential than Ag. Ag is therefore protected by Cu from getting oxidized. Although Ag NPs exhibit better SERS activity than Au NPs, Ag is relatively easier to oxidize, limiting the development of Ag-based nanomaterials. Therefore, despite the poor SERS activity of Au nanoparticles than that of Ag nanoparticles, Au nanoparticles have been widely used. Herein, the stabilization of Ag nanoparticles by incorporating a reductive process using anatase TiO2 is reported. The fabricated substrates bearing anatase, Ag NPs, and Cu Ps were stable, as seen by Raman spectra, and remained unchanged for more than 2 months.