Amplified light scattering and emission of silver and silver core–silica shell particles

Siiman, Olavi; Jitianu, Andrei; Bele, Marjan; Grom, Patricia; Matijević, Egon

doi:10.1016/j.jcis.2007.02.025

Cited by 20 publications

(20 citation statements)

References 60 publications

(89 reference statements)

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“…Experimentally, this was evident from the ability to detect Raman spectra of citrate and cross-linked aminodextran, two nonaromatic systems, on silver particles of single beads but not detect Raman spectra of citrate on single silver particles. 34 Estimates of the maximum SERS enhancement for citrate or Amdex bands per silver particle then range from 20 to 100 and would make it difficult to observe such bands above background for single silver particles.…”

Section: Discussionmentioning

confidence: 99%

Surface‐enhanced Raman scattering (SERS) of random silver or gold particle arrays on aminodextran‐coated polystyrene beads

Siiman¹,

Ledis²

2005

J Raman Spectroscopy

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Citrate and/or chemically modified aminodextran (Amdex) SERS bands were detected from silver particleAmdex-polystyrene (PS) beads either as singlets or small clusters, prepared by reaction between aqueous silver nitrate, Amdex-coated PS beads, and aqueous sodium citrate solution. However, citrate on individual silver or gold particles of the same size was not detected with 633-nm excitation. SERS of dyes such as rhodamine 6 G was readily observed on individual silver particles or on the gold beads. Three distinct modes of citrate/modified-Amdex binding to the silver particle-Amdex-PS beads were characterized: (1) exchangeable citrate bound through one or more carboxylate groups -citrate could be washed away with H 2 O or D 2 O; displaced by successively greater concentrations of R6G; or squeezed out mechanically by applying the pressure of a second coverslip on top of a droplet of bead suspension; (2) nonexchangeable Amdex bound to silver via a primary alcoholate ion of oxidized, glutaraldehyde-cross-linked Amdex; and (3) nonexchangeable oxidized Amdex bound to silver via carboxylate group(s) but with H/D exchangeable alcohol hydrogen atom. That oxidation of the glucopyranose residues of Amdex on PS beads had taken place by Ag(I) as silver nitrate in aqueous solution to split out carboxylate groups was first identified from their characteristic vibrational modes in the SERS spectra of colloidal silver suspensions.Minimum amplification factors for (R6G on Ag)/(R6G on Au) with 633-nm excitation were estimated as 1 × 10 15 /1 × 10 11 . An extra SERS enhancement of about 1000-fold due to multiplicity of metal particles per bead was included.

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Section: Discussionmentioning

confidence: 99%

Surface‐enhanced Raman scattering (SERS) of random silver or gold particle arrays on aminodextran‐coated polystyrene beads

Siiman¹,

Ledis²

2005

J Raman Spectroscopy

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“…These studies will provide a deeper understanding of the factors that control heterogeneity in a polymerization process. Possible other applications include stimulated emission depletion microscopy (STEM), a technique that requires substantial photon loads on dye molecules [79,[99][100][101][102] , and catalysis, [103,104] in which the low level of intrinsic dynamics of some of the rylene dyes at the singlemolecule level seems promising to follow the dynamics (individual turnover events) of the catalytic process itself. [105] In Section 3 we showed that chemical modifications of the rylene chromophore core as well as changes in the dynamics or polarity of their direct environment have a considerable impact on their optical properties.…”

Section: Nanoemitters For the Visualization Of Polymerization Processesmentioning

confidence: 99%

The Rylene Colorant Family—Tailored Nanoemitters for Photonics Research and Applications

et al. 2010

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This Review summarizes the latest advances in the field of rylene dyes and rylene nanoemitters for applications in photonics, and describes the influence of the dye design on the optical properties, the self-assembly, the molecular interactions, as well as the labeling specificity of the compounds. The interplay between tailored (macro)molecular design and bulk/single-molecule spectroscopy enables complex processes to be explained, for example, the kinetics of energy-transfer processes or (bio)catalysis. Such investigations are essential for the ultimate design of optimized nanoemitters, and require a close cooperation between spectroscopists and preparative organic chemists.

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“…This method has been studied extensively in the past decade to entrap metal, semiconductor, and metal oxide nanoparticles to create a variety of probes and imaging agents. [37][38][39][40][41][42][43][44][45][46][47] In order to grow homogeneous silica shells, the ''seed'' nanoparticles are usually precoated with a silanizing agent, such as aminopropyltrimethoxysilane (APS), mercaptopropyltrimethoxysilane (MPS), or poly(vinylpyrrolidone) (PVP) to mediate the silica adhesion and growth of a uniform shell. Because of the aqueous alcohol solution in which the Stö ber reaction takes place, hydrophobic nanoparticles must undergo a ligand exchange in order to effectively participate in Stö ber-type coating reactions.…”

Section: Fabrication Strategies For Encapsulating Nanomaterials In Simentioning

confidence: 99%

Designed Fabrication of Silica-Based Nanostructured Particle Systems for Nanomedicine Applications

et al. 2008

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Amplified light scattering and emission of silver and silver core–silica shell particles

Cited by 20 publications

References 60 publications

Surface‐enhanced Raman scattering (SERS) of random silver or gold particle arrays on aminodextran‐coated polystyrene beads

Surface‐enhanced Raman scattering (SERS) of random silver or gold particle arrays on aminodextran‐coated polystyrene beads

The Rylene Colorant Family—Tailored Nanoemitters for Photonics Research and Applications

Designed Fabrication of Silica-Based Nanostructured Particle Systems for Nanomedicine Applications

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