scholarly journals A brief review on nanoparticle based mercury sensing by optical method

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Swapnadip Roy ◽  
◽  
Swadesh Mandal
Keyword(s):  
Cost Effective ◽  
Living System ◽  
Review Article ◽  
Optically Active ◽  
Spectrometric Method ◽  
Mercury Species ◽  
Organic Mercury ◽  
Cost Effective Method ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

The distribution of mercury and its compounds has an adverse effect to the living system. However, among all the mercury species organic mercury is the most hazardous to the living beings. In this review article we are trying to canvass the article from the last two decades on sensitive and cost effective method to detect and/or sensing trace amount of mercury using optically active nanomaterials by colorimetric, fluorimetric and surface enhanced Raman spectrometric method.

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

2017 ◽  
Vol 53 (56) ◽  
pp. 7949-7952 ◽  
Author(s):  
Kun Chen ◽  
Xinyi Zhang ◽  
Douglas R. MacFarlane
Keyword(s):  
Raman Scattering ◽  
Cost Effective ◽  
Surface Enhanced Raman Scattering ◽  
Simple Approach ◽  
Hybrid Nanostructure ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanostructure Arrays ◽  
Enhanced Raman Scattering

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.

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

2021 ◽  
pp. 11-21
Author(s):  
Masayoshi Kaneko
Keyword(s):  
Glass Surface ◽  
Sodium Citrate ◽  
Cost Effective ◽  
Anatase Tio2 ◽  
Tio2 Surface ◽  
Raman Intensity ◽  
Entire Surface ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

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.

scholarly journals A simple and reliable approach for the fabrication of nanoporous silver patterns for surface-enhanced Raman spectroscopy applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Angela Capaccio ◽  
Antonio Sasso ◽  
Giulia Rusciano
Keyword(s):  
Raman Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Low Cost ◽  
Cost Effective ◽  
Surface Enhanced Raman Spectroscopy ◽  
Raman Signal ◽  
Plasmonic Nanostructures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Good Signal

AbstractThe fabrication of plasmonic nanostructures with a reliable, low cost and easy approach has become a crucial and urgent challenge in many fields, including surface-enhanced Raman spectroscopy (SERS) based applications. In this frame, nanoporous metal films are quite attractive, due to their intrinsic large surface area and high density of metal nanogaps, acting as hot-spots for Raman signal enhancement. In this paper, we report a detailed study on the fabrication of nanoporous silver-based SERS substrates, obtained by the application of two successive treatments with an Inductively Coupled Plasma (ICP) system, using synthetic air and Ar as feeding gases. The obtained substrates exhibit a quite broad plasmonic response, covering the Vis–NIR range, and an enhancement factor reaching 6.5 $$\times\, 10^7$$ × 10 7 , estimated by using 4-mercaptobenzoic acid (4-MBA) as probe molecule at 532 nm. Moreover, the substrates exhibit a quite good spatial reproducibility on a centimeter scale, which assures a good signal stability for analytical measurements. Globally, the developed protocol is easy and cost effective, potentially usable also for mass production thanks to the remarkable inter-batches reproducibility. As such, it holds promise for its use in SERS-based sensing platforms for sensitive detection of targets molecules.

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

2013 ◽  
Vol 754 ◽  
pp. 143-169 ◽  
Author(s):  
Mohammad Kamal Hossain
Keyword(s):  
Raman Scattering ◽  
Cost Effective ◽  
Surface Enhanced Raman Scattering ◽  
Localized Surface Plasmon ◽  
Raman Signal ◽  
Wide Range ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
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.

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

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 ◽  
Surface Enhanced Raman Scattering ◽  
Gold Thin Film ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
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.

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