Characterization of laser-ablated and chemically reduced silver colloids in aqueous solution by UV/VIS spectroscopy and STM/SEM microscopy

Brause, Robert; Möltgen, Holger; Kleinermanns, Karl

doi:10.1007/s00340-002-1024-3

Cited by 138 publications

(89 citation statements)

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“…23 The spectra in Figure 2A show a symmetrical and narrow peak at about 400 nm and a broad tail in the UV part, which are both characteristic of Ag(0) particles, as extensively described by Kerker 24 and more recently by Kleinermanns et al, 25 and originate from particle plasmon excitation and interband transitions. Since the particle size determines the absorption wavelength, 7 the blue shift of the absorption maximum in the order of 20-25 nm compared with absorption maxima reported for similar colloids produced via chemical reduction indicates a considerably smaller average particle size.…”

Section: Resultssupporting

confidence: 63%

“…Since the particle size determines the absorption wavelength, 7 the blue shift of the absorption maximum in the order of 20-25 nm compared with absorption maxima reported for similar colloids produced via chemical reduction indicates a considerably smaller average particle size. Furthermore, the bandwidth of the electronic absorption at the highest repetition rate (40 Hz) was significantly smaller than chemically produced colloids, ie, 87 nm compared to a bandwidth of ∼162 nm, 25 which altogether indicates that LASiS produces a narrower particle size distribution per se. The prominent single peak at about 400 nm suggests that the Ag-NPs present in the starch solution were predominantly spherical in shape, as described in various reports.…”

Section: Resultsmentioning

confidence: 95%

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The effect of laser repetition rate on the LASiS synthesis of biocompatible silver nanoparticles in aqueous starch solution

Zamiri¹,

Zakaria²,

Ahangar³

et al. 2013

IJN

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Laser ablation-based nanoparticle synthesis in solution is rapidly becoming popular, particularly for potential biomedical and life science applications. This method promises one pot synthesis and concomitant bio-functionalization, is devoid of toxic chemicals, does not require complicated apparatus, can be combined with natural stabilizers, is directly biocompatible, and has high particle size uniformity. Size control and reduction is generally determined by the laser settings; that the size and size distribution scales with laser fluence is well described. Conversely, the effect of the laser repetition rate on the final nanoparticle product in laser ablation is less well-documented, especially in the presence of stabilizers. Here, the influence of the laser repetition rate during laser ablation synthesis of silver nanoparticles in the presence of starch as a stabilizer was investigated. The increment of the repetition rate does not negatively influence the ablation efficiency, but rather shows increased productivity, causes a red-shift in the plasmon resonance peak of the silver-starch nanoparticles, an increase in mean particle size and size distribution, and a distinct lack of agglomerate formation. Optimal results were achieved at 10 Hz repetition rate, with a mean particle size of ∼10 nm and a bandwidth of ∼6 nm 'full width at half maximum' (FWHM). Stability measurements showed no significant changes in mean particle size or agglomeration or even flocculation. However, zeta potential measurements showed that optimal double layer charge is achieved at 30 Hz. Consequently, Ag-NP synthesis via the laser ablation synthesis in solution (LASiS) method in starch solution seems to be a trade-off between small size and narrow size distributions and inherent and long-term stability.

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Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 95%

The effect of laser repetition rate on the LASiS synthesis of biocompatible silver nanoparticles in aqueous starch solution

Zamiri¹,

Zakaria²,

Ahangar³

et al. 2013

IJN

View full text Add to dashboard Cite

show abstract

“…Silver nanoparticles have been synthesized by either direct evaporation of silver into a liquid medium, such as laser ablation [6][7][8][9], or by reducing silver ions chemically [10][11][12] or through irradiation by electrons [13], ultraviolet (UV) light [14] or Gamma ray [15,16]. To load silver nanoparticles on the surface of fibers, the fibers are usually exposed to a silver nanoparticle sol, resulting in random attachment of nanoparticles on the surface [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Photo-induced growth of silver nanoparticles using UV sensitivity of cellulose fibers

Omrani

Taghavinia

2012

Applied Surface Science

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“…8, No. 1;2016 band shifts to longer wavelengths with increasing particle size, the change in the particle shape, the interparticle interactions and particle associations (Brause et al, 2002;Kerker, 1985;Sosa et al, 2003).…”

Section: Optical Propertiesmentioning

confidence: 99%

Noble Metal Nanoparticles and Their (Bio) Conjugates. II. Preparation

Capek¹

2016

IJC

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Hybrid nanoparticles of gold and silver can not only retain the beneficial features of both nanomaterials, but also possess unique advantages (synergism) over the other two types. Novel pseudospherical and anisotropic nanoparticles, bimetallic triangular nanoparticles, and core@shell nanoparticles were prepared by the different procedures for various applications and understanding both the particle evolution (nucleation) and nanoparticle anisotropy. Hybrid nanoparticles of gold and silver are considered to be low in toxicity, and exhibit facile surface functionalization chemistry. Furthermore, their absorption peaks are located in visible and near-infrared region. These nanoparticles provide significant plasmon tunability, chemical and surface modification properties, and significant advances in the growth into anisotropic nanostructures. The photoinduced synthesis can be used to prepare various (sub) nanoparticles and OD and 1D nanoparticles. Ostwald and digestive ripening provided narrower particle size distribution.Keywords: functional, hybrid, core@shell, bimetallic and (an) isotropic noble metal nanoparticles, Oswaldt and digestive ripening process IntroductionThe noble metal nanoparticle colloids were reported to exhibit a wide range of various applications from different fluids to in vitro and vivo as a carrier for drug delivery into cells and tissues to optical and magnetic manipulations in biomedical systems as well (Sun et al., 2000). The unique physical and chemical properties of nanoparticles are given by their large surface area or a large surface-to-volume ratio and high reactivity. The unique optical and magnetic properties of nanoparticles are controlled by the type of atoms (metals), composition of nanoparticles, particle shape, type and concentration of functional groups and so on (Feldmann, 2003). For example, the composite nanoparticles with the iron atoms domains generate the magnetism and with the gold atoms exhibit the unique optical features. Therefore such nanoparticles exhibit unique properties which mostly strongly differ from the bulk or classical materials.The future generation of environmental nanotechnologies based on noble metal nanoparticles is supposed to replace conventional environmental technologies by novel nano(bio)technologies (Modi, et al., 2003). Zero-and one-dimensional (0D and 1D) nanoparticles and two-and three (2D and 3D) nanoparticle assays belong to these unique nanomaterials. Especially the nanostructures decorated with different (bio) molecules are exceptional materials with nonconventional such as biomedical harvesting properties.Polymer-or biopolymer decorated metal nanoparticles are prepared by several procedures with and without templates. Most existing procedures explore the strong affinity of alkylthiol ligands and surfactants to gold and silver (Brust et al., 1994), the use of alkyl or aryl derivatives of disulfides (Shon et al., 2001), and thioethers (Li et al., 2001) as well. Furthermore, organic compounds with polar groups (Boal et al., 2000), t...

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Characterization of laser-ablated and chemically reduced silver colloids in aqueous solution by UV/VIS spectroscopy and STM/SEM microscopy

Cited by 138 publications

References 0 publications

The effect of laser repetition rate on the LASiS synthesis of biocompatible silver nanoparticles in aqueous starch solution

The effect of laser repetition rate on the LASiS synthesis of biocompatible silver nanoparticles in aqueous starch solution

Photo-induced growth of silver nanoparticles using UV sensitivity of cellulose fibers

Noble Metal Nanoparticles and Their (Bio) Conjugates. II. Preparation

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