Electron spectroscopic analysis of silver nanoparticles in a soda-glass matrix

Bera, Santanu; Gangopadhyay, P.; Nair, K.G.M.; Panigrahi, B. K.; Narasimhan, S.V.

doi:10.1016/j.elspec.2006.03.008

Cited by 44 publications

(39 citation statements)

References 23 publications

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“…It is observed that though the relaxation energy of around 0.5 eV is developed in the photoemission process due to particle size, the effect has no contribution to the value of the Auger parameter. It has been observed earlier in case of Ag nanoparticles [13] that the change in binding energy due to change in the particle size also leads to the change in Auger peak energy [13]. In the present case, it is also expected that there is a corresponding negative shift in Auger kinetic energy in the relaxation process which nullifies the size effect on Auger parameter.…”

Section: Resultssupporting

confidence: 62%

Analysis on Binding Energy and Auger Parameter for Estimating Size and Stoichiometry of ZnO Nanorods

Bera

Dhara

Velmurugan

et al. 2012

International Journal of Spectroscopy

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ZnO nanorods prepared through chemical vapor deposition technique are characterized by microscopic and X-ray photoelectron spectroscopy (XPS) techniques to correlate the effects of size on the binding energy of Zn 2p3/2 photoelectrons. A positive shift in Zn 2p3/2-binding energy as compared to that in bulk ZnO is assumed to be the effect of size of ZnO tips. The shift in binding energy has been explained in terms of relaxation energy in the photoemission process. Simultaneously, Auger parameter of the nanorods is evaluated for stoichiometric composition. The extra peak in O1s spectrum of nanorods is explained as adsorbed O-bearing species or surface contaminants.

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Section: Resultssupporting

confidence: 62%

Analysis on Binding Energy and Auger Parameter for Estimating Size and Stoichiometry of ZnO Nanorods

Bera

Dhara

Velmurugan

et al. 2012

International Journal of Spectroscopy

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“…As previously described for other PMFs,42 determining the chemical state of silver on the sole basis of the Ag 3d binding energy is difficult, due to particle size and charging effects. The modified Auger parameter ( α ′), defined as the sum of the binding energy of the intense photoemission peak (Ag 3d 5/2 ) with the kinetic energy of the sharpest M 4 N 45 N 45 Auger line, was thus calculated and reached 726.2 eV, in accordance with literature data reported for metallic silver 44–45. The C 1s signal, reported in Figure 3, included the contributions of hydrocarbons bonded to Si (284.4 eV), CC bonds (285.0 eV), and organic compounds (286.4, 288.2 eV), resulting from plasma decomposition/polymerization of the HMDSO precursor and probably from carbon residues present in the contamination layer.…”

Section: Resultssupporting

confidence: 74%

Plasma‐Mediated Nanosilver‐Organosilicon Composite Films Deposited on Stainless Steel: Synthesis, Surface Characterization, and Evaluation of Anti‐Adhesive and Anti‐Microbial Properties on the Model Yeast Saccharomyces cerevisiae

Saulou‐Bérion

Despax

Raynaud

et al. 2011

Plasma Processes & Polymers

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A series of plasma‐mediated thin films (≈175 nm), containing silver nanoparticles embedded in an organosilicon matrix with controllable properties (silver content, nanoparticle size, matrix composition), were deposited onto stainless steel and chemically and structurally characterized, using a large set of analytical techniques. The process originality relies on a dual strategy, associating silver sputtering, and simultaneous plasma enhanced chemical vapor deposition, in an argon‐hexamethyldisiloxane plasma, using an asymmetrical radiofrequency discharge at 13.56 MHz. X‐ray photoelectron spectroscopy, FTIR spectroscopy, and Raman spectroscopy demonstrated the inclusion of metallic silver nanoparticles within the organosilicon‐like matrix. Silver content was directly related to the plasma process conditions. TOF‐SIMS analysis revealed that the film composition was homogeneous in depth. SEM and TEM observations confirmed the nanoparticle‐based morphology of the coatings, dependent on the silver content. The film anti‐adhesive potentialities were evaluated in vitro toward the model yeast Saccharomyces cerevisiae by performing shear‐flow induced detachment experiments, under well‐controlled hydrodynamic, and physico‐chemical conditions. The maximal effect was achieved for the organosilicon matrix alone. When silver nanoparticles were incorporated, yeast detachment was lower, probably due to the strong affinity of embedded silver for biological components of the cell wall surface. The presence of methyl groups in the matrix network could also promote enhanced hydrophobic yeast/coating interactions. An anti‐microbial action of silver (conjugated effect of nanoparticles and chemisorbed Ag+ ions and complexes released through nanoparticle oxidation) at the immediate vicinity of the coating surface occurred, depending on the silver content. In the conditions under study, a maximal 1.9 log reduction in viable counts was observed, compared to control conditions with bare stainless steel. Based on NanoSIMS50 elemental mapping, various characteristic cell sub‐structures and inclusions were detected, such as cell wall and nucleus. After yeast exposure to nanosilver‐containing films, a quite homogeneous distribution of released silver all over the cell was observed, overlapping with sulfur and phosphorous signals.

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“…5C can be assigned to two components. The major component is Ag 0 indicating the formation of AgNPs, and the lesser component is Ag-O-due to the surface of AgNPs being bound to the anionic oxygen of SiO 2 shell [35][36][37]. The peaks at Ag 0 3d 5/2 and Ag 0 3d 3/2 (368.0 eV and 374.0 eV) of Fe 3 O 4 @SiO 2 -Ag nanocomposite shift to lower binging energy in compared with pure silver (368.2 eV for Ag 3d 5/2 , 374.2 eV for Ag 3d 3/2 ), further confirming that there is an interaction between the SiO 2 shell and AgNPs.…”

Section: The Characterization Of Fe 3 O 4 @Sio 2 -Ag Core-shell Nanocmentioning

confidence: 99%

Synthesis of Fe3O4@SiO2–Ag magnetic nanocomposite based on small-sized and highly dispersed silver nanoparticles for catalytic reduction of 4-nitrophenol

Chi

Yuan

et al. 2012

Journal of Colloid and Interface Science

297

130

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Electron spectroscopic analysis of silver nanoparticles in a soda-glass matrix

Cited by 44 publications

References 23 publications

Analysis on Binding Energy and Auger Parameter for Estimating Size and Stoichiometry of ZnO Nanorods

Analysis on Binding Energy and Auger Parameter for Estimating Size and Stoichiometry of ZnO Nanorods

Plasma‐Mediated Nanosilver‐Organosilicon Composite Films Deposited on Stainless Steel: Synthesis, Surface Characterization, and Evaluation of Anti‐Adhesive and Anti‐Microbial Properties on the Model Yeast Saccharomyces cerevisiae

Synthesis of Fe3O4@SiO2–Ag magnetic nanocomposite based on small-sized and highly dispersed silver nanoparticles for catalytic reduction of 4-nitrophenol

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