Re-crystallization of silver nanoparticles in a highly concentrated NaCl environment—a new substrate for surface enhanced IR-visible Raman spectroscopy

Prucek, Robert; Panáček, Aleš; Fargašová, Ariana; Ranc, Václav; Mašek, Vlastimil; Kvı́tek, Libor; Zbořil, Radek

doi:10.1039/c0ce00776e

Cited by 28 publications

(29 citation statements)

References 40 publications

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“…The mostly used lower nal concentrations of sodium chloride (in orders of units of mM) are not sufficient to increase the size of the particles enough to enhance the Raman signal equipped with laser of longer wavelengths, but as we have observed in our previous study, the addition of highly concentrated sodium chloride solution (hundreds of mM) to maltose-reduced silver colloid increases the particle size enough to achieve an effectiveness of enhancement of the Raman signal even for near infrared laser excitation (1064 nm). 38 In terms of activation by 100 mM and 200 mM chloride ions, the very similar effect of these concentrations was observed, albeit the Raman intensities were higher with the use of 200 mM NaCl. Regarding the laser operating at 532 nm, there the Raman intensities for both concentration levels are stable during a whole measuring time (Fig.…”

Section: Resultssupporting

confidence: 72%

Influence of various chloride ion concentrations on silver nanoparticle transformations and effectiveness in surface enhanced Raman scattering for different excitation wavelengths

et al. 2015

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The effect of six various chloride ion concentrations (25, 50, 100, 200, 400, and 800 mM) on timedependence and surface enhanced Raman scattering (SERS) signal intensity was investigated for silver nanoparticles ($28 nm) with a high monodispersity and long time stability. The experiments were performed using three lasers with excitation wavelengths in the visible region (532 nm, 633 nm, 780 nm).Adenine was used as a model analyte. The treatment procedure, when the various sodium chloride solutions added to silver nanoparticles, led to an enhancement in the Raman signal at all studied concentration levels of sodium chloride. Nevertheless, low-concentration chloride ions differently influenced the time course of enhancement efficiency contrary to high-concentration chloride ions. The final concentration of chloride ions equal to 25 mM did not have any pronounced influence on the silver particle sizes and morphologies. The final concentration of chloride ions varying from 50 to 200 mM led to the etching and coalescence of silver nanoparticles. Higher concentrations of chlorides (400 mM) caused re-crystallization of primary silver nanoparticles to one order larger crystallites (400 nm). From the point of view of SERS, the time dependent profiles of Raman signal enhancement differ only slightly for all the used final concentrations of chloride ions when using excitation at 532 nm. On the contrary, for excitation wavelengths 633 nm and 780 nm, the time dependent profiles of Raman signal enhancement were very different when using above mentioned six various final concentrations of chloride ions.

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Section: Resultssupporting

confidence: 72%

Influence of various chloride ion concentrations on silver nanoparticle transformations and effectiveness in surface enhanced Raman scattering for different excitation wavelengths

et al. 2015

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“…However, the formation of silver oxide precipitate occurs at this pH value. To keep the silver ions in a homogeneous state at alkaline pH values, it is necessary to exploit a complex agent such as sulfite or ammonia 49 – 51 . Bonding silver ions to the complex compound reduces the redox potential from + 0.80 to + 0.58 V in the case of ammonia with a final concentration equal to 1.25 mmol dm −3 .…”

Section: Resultsmentioning

confidence: 99%

Specific detection of Staphylococcus aureus infection and marker for Alzheimer disease by surface enhanced Raman spectroscopy using silver and gold nanoparticle-coated magnetic polystyrene beads

Prucek

Panáček

Gajdová

et al. 2021

Sci Rep

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Targeted and effective therapy of diseases demands utilization of rapid methods of identification of the given markers. Surface enhanced Raman spectroscopy (SERS) in conjunction with streptavidin–biotin complex is a promising alternative to culture or PCR based methods used for such purposes. Many biotinylated antibodies are available on the market and so this system offers a powerful tool for many analytical applications. Here, we present a very fast and easy-to-use procedure for preparation of streptavidin coated magnetic polystyrene–Au (or Ag) nanocomposite particles as efficient substrate for surface SERS purposes. As a precursor for the preparation of SERS active and magnetically separable composite, commercially available streptavidin coated polystyrene (PS) microparticles with a magnetic core were utilized. These composites of PS particles with silver or gold nanoparticles were prepared by reducing Au(III) or Ag(I) ions using ascorbic acid or dopamine. The choice of the reducing agent influences the morphology and the size of the prepared Ag or Au particles (15–100 nm). The prepare composites were also characterized by HR-TEM images, mapping of elements and also magnetization measurements. The content of Au and Ag was determined by AAS analysis. The synthesized composites have a significantly lower density against magnetic composites based on iron oxides, which considerably decreases the tendency to sedimentation. The polystyrene shell on a magnetic iron oxide core also pronouncedly reduces the inclination to particle aggregation. Moreover, the preparation and purification of this SERS substrate takes only a few minutes. The PS composite with thorny Au particles with the size of approximately 100 nm prepared was utilized for specific and selective detection of Staphylococcus aureus infection in joint knee fluid (PJI) and tau protein (marker for Alzheimer disease).

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“…Nanoparticles were synthesized using a modified procedure described by Kvitek et al , Soukupova et al , and Prucek et al This procedure is based on the reduction of silver salt (silver nitrate is usually used) by a selected reduction agent (e.g. reduction sugar, sodium citrate, etc.)…”

Section: Methodsmentioning

confidence: 99%

Quantification of purine basis in their mixtures at femto‐molar concentration levels using FT‐SERS

Ranc

Hruzikova

Maitner

et al. 2011

J Raman Spectroscopy

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Surface-enhanced Raman scattering spectroscopy represents one of the unique techniques for studying nanoscale objects, and its distinctive properties can be used in the process of further analysis. The careful evaluation of the particular influence of selected key-role experimental parameters (e.g. pH value of measured sample mixture, size and distribution of used nanoparticles) and the influence of reduction agent used in the process of formation of desired nanoparticle objects presents an important task in the further study of surface-enhanced Raman scattering effect. A broad study of these experimental parameters was performed in this paper. The main aim of the presented work was to a demonstrate an application potential of selected experimental conditions in the determination of three purine bases: adenine, xanthine, and hypoxanthine. The resulting limits of detection are at femtomolar concentration levels for all three studied compounds.

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Re-crystallization of silver nanoparticles in a highly concentrated NaCl environment—a new substrate for surface enhanced IR-visible Raman spectroscopy

Cited by 28 publications

References 40 publications

Influence of various chloride ion concentrations on silver nanoparticle transformations and effectiveness in surface enhanced Raman scattering for different excitation wavelengths

Influence of various chloride ion concentrations on silver nanoparticle transformations and effectiveness in surface enhanced Raman scattering for different excitation wavelengths

Specific detection of Staphylococcus aureus infection and marker for Alzheimer disease by surface enhanced Raman spectroscopy using silver and gold nanoparticle-coated magnetic polystyrene beads

Quantification of purine basis in their mixtures at femto‐molar concentration levels using FT‐SERS

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