The kinetics of homogeneous nucleation of silver nanoparticles stabilized by polymers

Patakfalvi, Rita; Papp, Szilvia; Dékány, Imre

doi:10.1007/s11051-006-9139-9

Cited by 75 publications

(49 citation statements)

References 26 publications

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“…The most frequently used is poly(N-vinyl-2-pyrrolidone) (PVP) of various molecular weights, which exhibits a highly effective protective function in both organic and aqueous media. PVP has been shown to be an effective stabilizer of aqueous dispersions of Ag and Cu NPs [67,79,[93][94][95][100][101][102][103][104][105][106][107][108] as well as an effective stabilizer of Ag and Cu NPs in organic solvents [69,101,109] and especially in polyol synthesis [61,77,78,110]. The polyol method, while using PVP as a stabilizer, was utilized in the preparation of Ag and Cu NPs (size range of 40-50 nm) as precursors of metal-based conductive inks [111][112][113][114][115].…”

Section: Stabilization Of Metal Nps Against Aggregationmentioning

confidence: 99%

Metal-based Inkjet Inks for Printed Electronics

Kamyshny¹,

Steinke²,

Magdassi

2011

TOAPJ

368

242

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Abstract:A review on applications of metal-based inkjet inks for printed electronics with a particular focus on inks containing metal nanoparticles, complexes and metallo-organic compounds. The review describes the preparation of such inks and obtaining conductive patterns by using various sintering methods: thermal, photonic, microwave, plasma, electrical, and chemically triggered. Various applications of metal-based inkjet inks (metallization of solar cell, RFID antennas, OLEDs, thin film transistors, electroluminescence devices) are reviewed.

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Section: Stabilization Of Metal Nps Against Aggregationmentioning

confidence: 99%

Metal-based Inkjet Inks for Printed Electronics

Kamyshny¹,

Steinke²,

Magdassi

2011

TOAPJ

368

242

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“…The ethanol solution of Ag-nanoparticle, S Ag for fabrication of Ag-nanoparticles titania thin film was also prepared separately based on the method that we reported recently [32] and Scheme 1b shows how the silver precursor solution S Ag was synthesized. For Ag nanoparticle suspensions, a common method is the Lee-Meisel method, which is a variation of the Turkevich method in that Ag nitrate is used as the metal source [22,46]. The application of acetate in the reaction allowed synthesizing metallic nanoparticles without any additional reducer.…”

Section: Preparation Of Coating Precursor Solutions S Ti S Ag and mentioning

confidence: 99%

“…These noble metals act separately or simultaneously depending on the photoreaction conditions, experimental methods used and they may (i) enhance the electron-hole separation by acting as electron traps [8][9][10][11], (ii) extend the light absorption into the visible range and enhance surface electron excitation by sizeand shape-dependent plasmon resonances excited by visible light [7,[12][13][14] and/or (iii) modify the surface properties of TiO 2 [15,16]. The early methods [17][18][19], to produce noble-metal nanoparticles are still used today and continue to be the standard by which other synthesis methods are compared [20][21][22]. In particular, silver as a noble metal has attracted considerable attention, as a result of its remarkable role in the improvement of the photo-activity of semiconductors [9,13,23].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

et al. 2013

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Abstract:The Ag-nanoparticles (Ag-NP)/TiO 2 composite thin films with various amounts of Ag (10 mol% ≤ n ≤ 80 mol%) were examined as a potential photocatalyst by decoloration reaction of methylene blue (MB) in an aqueous solution. These composite thin films of ca. 100 nm thickness were fabricated by the MPM at 600 °C in air. The decoloration rates monitored by the absorption intensity of the MB solution indicated that the composite thin films of Ag with an amount less than 40 mol% are not effective under vis-irradiation, though they can work as a photocatalyst under UV-irradiation. Further, the UV-sensitivity of the composite thin films gradually decreased to almost half the level of that of the TiO 2 thin film fabricated under the identical conditions when the Ag amount increased from 10 to 40 mol%. Contrarily, the composite thin films of Ag content larger than 50 mol% showed the vis-responsive activity, whose level was slightly lower than the decreased UV-sensitivity. Diffuse reflectance spectra suggested that the vis-responsive OPEN ACCESSCatalysts 2013, 3 626 activity of the composite thin films is due to the conductivity, localized surface plasmon resonance and surface plasmon resonance of Ag-NP. It was also elucidated that the vis-responsive level of the composite thin films corresponds to their electrical conductivity that depends on the Ag content.

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“…According to Bönnemann et al 37 and Patakfalvi et al 38 , the nucleation of metal nanoparticles by reduction technique is an autocatalytic process: a slow, continuous nucleation is followed by rapid, autocatalytic particle growth. The steric stabilization by the large molar ratio of NaAlg (supersaturation) at the first step in the chemical reduction is the probable reason for the formation of Cu NPs of smaller size.…”

Section: Intensity (Au)mentioning

confidence: 99%

Study on antibacterial alginate-stabilized copper nanoparticles by FT-IR and 2D-IR correlation spectroscopy

Díaz-Visurraga¹,

Daza²,

Pozo³

et al. 2012

IJN

110

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Background:The objective of this study was to clarify the intermolecular interaction between antibacterial copper nanoparticles (Cu NPs) and sodium alginate (NaAlg) by Fourier transform infrared spectroscopy (FT-IR) and to process the spectra applying two-dimensional infrared (2D-IR) correlation analysis. To our knowledge, the addition of NaAlg as a stabilizer of copper nanoparticles has not been previously reported. It is expected that the obtained results will provide valuable additional information on: (1) the influence of reducing agent ratio on the formation of copper nanoparticles in order to design functional nanomaterials with increased antibacterial activity, and (2) structural changes related to the incorporation of Cu NPs into the polymer matrix. Methods: Cu NPs were prepared by microwave heating using ascorbic acid as reducing agent and NaAlg as stabilizing agent. The characterization of synthesized Cu NPs by ultraviolet visible spectroscopy, transmission electron microscopy (TEM), electron diffraction analysis, X-ray diffraction (XRD), and semiquantitative analysis of the weight percentage composition indicated that the average particle sizes of Cu NPs are about 3-10 nm, they are spherical in shape, and consist of zerovalent Cu and Cu 2 O. Also, crystallite size and relative particle size of stabilized Cu NPs were calculated by XRD using Scherrer's formula and FT from the X-ray diffraction data. Thermogravimetric analysis, differential thermal analysis, differential scanning calorimetry (DSC), FT-IR, second-derivative spectra, and 2D-IR correlation analysis were applied to studying the stabilization mechanism of Cu NPs by NaAlg molecules. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of stabilized Cu NPs against five bacterial strains (Staphylococccus aureus ATCC 6538P, Escherichia coli ATCC 25922 and O157: H7, and Salmonella enterica serovar Typhimurium ATCC 13311 and 14028) were evaluated with macrodilution, agar dilution plate count, and well-diffusion methods. Results: On the basis of the semiquantitative analysis, there was a direct correlation between the reducing agent ratio and the percentage of zerovalent Cu. This was confirmed with the statistical analysis of population of Cu NPs from TEM micrographs. At lower reducing agent ratios, two phases coexist (Cu 2 O and zerovalent Cu) due to incomplete reduction of copper ions by the reducing agent; however, at higher reducing agent ratios, the Cu NPs consist mainly of zerovalent Cu. Crystallite size and relative particle size of stabilized Cu NPs showed considerable differences in results and tendencies in respect to TEM analysis. However, the relative particle size values obtained from FT of XRD data agreed well with the histograms from the TEM observations. From FT results, the relative particle size and reducing agent ratio of stabilized Cu NPs showed an inverse correlation. The incomplete reduction of copper ions at lower reducing agent ratios was also confirmed by DSC studies. FT-IR and 2D-IR correl...

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The kinetics of homogeneous nucleation of silver nanoparticles stabilized by polymers

Cited by 75 publications

References 26 publications

Metal-based Inkjet Inks for Printed Electronics

Metal-based Inkjet Inks for Printed Electronics

Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

Study on antibacterial alginate-stabilized copper nanoparticles by FT-IR and 2D-IR correlation spectroscopy

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