Single layers of diblock copolymer micelles for the fabrication of arrays of nanoparticles

Yoo, Seong Il; Kwon, Jeong-Hwa; Sohn, Byeong‐Hyeok

doi:10.1039/b703725b

Cited by 51 publications

(64 citation statements)

References 35 publications

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“…These were: potassium chloride (KCl; Sigma-Aldrich), potassium ferrocyanide (K 4 Fe(CN) 6 ; BDH Chemicals Ltd, UK), copper sulfate (CuSO 4 ; Aldrich), sodium sulfate (Na 2 SO 4 ; Aldrich) and hydrochloric acid (HCl; Sigma-Aldrich). All solutions were prepared with deionized water of resistivity no less than 18.2 MU cm at 25 C (Millipore water system, UK).…”

Section: Chemical Reagents and Instrumentationmentioning

confidence: 99%

“…Prior to the voltammetric experiments, the system of 0.1 mM K 4 Fe(CN) 6 /0.1 M KCl was degassed using purified N 2 . All experiments were conducted at 25 AE 1 C. Chronoamperometric transients for the oxidation of potassium ferrocyanide were recorded using different sample times: 0.05 s before the potential step and 0.0001, 0.001, 0.01 or 0.05 s after the potential step.…”

Section: Chemical Reagents and Instrumentationmentioning

confidence: 99%

“…The development of lithography, nanoprinting, 1 plasma etching, 2 laser microstructuring 3 and other techniques [4][5][6][7][8] permits the fabrication of surfaces with a precisely defined geometry at the micro-or nano-scale that allows the fabrication of microelectrode arrays. Microelectrode arrays find wide application in electroanalysis due to their high current output as compared to a single microelectrode, whilst showing considerably less background/capacitative currents, as well as significantly enhanced sensitivity, in comparison to macroelectrodes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigating the concept of diffusional independence. Potential step transients at nano- and micro-electrode arrays: theory and experiment

Menshykau

Huang

Rees

et al. 2009

Analyst

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Microelectrode arrays find broad application in electroanalysis offering the enhanced sensitivity associated with microelectrodes, but with a high total current output. Such arrays are often constructed to make the electrodes 'diffusionally independent'. To emphasize that this is a time dependent property, a two-dimensional simulation, in conjunction with the diffusional domain approach, is used to model potential step transient currents at microelectrode arrays. Two types of array, hexagonal and cubic, are considered. In both cases the absolute (not relative) microelectrode separation distance has a significant effect on transient current. Three different regimes of transient current versus time can be observed at microelectrode arrays. At short times the transient response of isolated microelectrodes is seen, then at intermediate times the steady-state response of independent electrodes can be observed. At longer times planar diffusion to the entire array takes over. It follows that only at timescales corresponding to the first two regimes can the electrodes be considered as diffusionally independent. To verify the theory the potential step experiment is performed at a regularly spaced hexagonal iridium microdisk array. Theory is found to be in a good agreement with the experimental results.

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Section: Chemical Reagents and Instrumentationmentioning

confidence: 99%

Section: Chemical Reagents and Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigating the concept of diffusional independence. Potential step transients at nano- and micro-electrode arrays: theory and experiment

Menshykau

Huang

Rees

et al. 2009

Analyst

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“…[20,[22][23][24] PS-PVP micelles can solubilize polar fluorescent dyes, which are insoluble in toluene, within polar PVP cores with toluenesoluble PS coronas. [20] Since a thin film of micelles can be spincoated from a micellar solution, fluorescent dyes can be effectively incorporated into a solid film with nanoscopic encapsulation.…”

Section: Resultsmentioning

confidence: 99%

Enhancement and Concurrence of Emissions from Multiple Fluorophores in a Single Emitting Layer of Micellar Nanostructures

Yoo

Lee

Sohn

et al. 2008

Adv Funct Materials

Self Cite

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For concurrent emission of multiple fluorophores from a single emitting layer with a highly efficient energy transfer from antenna molecules to emitting molecules by fluorescence resonance energy transfer (FRET), a paradoxical requirement in an emitting layer is necessary, that is, close placement of an emitting fluorophore and a harvesting molecule, and isolation of emitting fluorophores. Here we demonstrate how to overcome this paradox by full utilization of a micellar nanostructure consisting of a core and a corona, that is, the core is used as a place for FRET between light‐collecting donors and light‐emitting fluorophores, and the corona is used as a barrier for FRET between light‐emitting fluorophores. Enhancement of light emission from fluorophores was achieved by locating emitting fluorophores and light‐harvesting molecules at the same core of micelles. Moreover, with the same micellar nanostructure, concurrent emission of multiple fluorophores with enhanced intensity was induced by isolating them in independent micelles, the corona structure of which worked as an effective blockade for FRET.

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“…The most popular approach involves the synthesis of nanoparticles in situ within the block copolymer template by using preformed micelles of block copolymers containing metal precursors [6][7][8][9][10][11]. As a consequence of the strong affinity of the amines to various ions and polar groups, the polymers containing a pyridine moiety can make strong bonds with various metal ions or nanoparticles and have attracted increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polystyrene-b-poly(2-vinylpyridine) coordinated to metal or metal ion nanoparticles

Lekesiz

Kaleli

Uyar

et al. 2014

Journal of Analytical and Applied Pyrolysis

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a b s t r a c tIn this study, Co, Cr or Au 3+ functional polystyrene-block-poly(2-vinylpyridine), PS-b-P2VP complexes were prepared and characterized. Coordination of metal atom or ion to nitrogen atom of pyridine rings was confirmed by FTIR analyses. The strength and efficiency of coordination of P2VP blocks to Co, Cr or Au 3+ mainly depends on charge and stability of the complex formed that is mainly related to the energy of d orbitals. The results reveal that the thermal stability of the polymer composite formed increases with the increase in strength of the coordination. Changes in thermal decomposition mechanism and product distribution were recorded. Degradation of P2VP units coordinated to Cr, Co or Au 3+ was started by loss of pyridine units leaving an unsaturated and/or crosslinked polymer backbone that degraded at relatively high temperatures.

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Single layers of diblock copolymer micelles for the fabrication of arrays of nanoparticles

Cited by 51 publications

References 35 publications

Investigating the concept of diffusional independence. Potential step transients at nano- and micro-electrode arrays: theory and experiment

Investigating the concept of diffusional independence. Potential step transients at nano- and micro-electrode arrays: theory and experiment

Enhancement and Concurrence of Emissions from Multiple Fluorophores in a Single Emitting Layer of Micellar Nanostructures

Preparation and characterization of polystyrene-b-poly(2-vinylpyridine) coordinated to metal or metal ion nanoparticles

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