Hybrid hierarchical patterns of gold nanoparticles and poly(ethylene glycol) microstructures

Chen, Jingyu; Arafeh, Manar; Guiet, Amandine; Felkel, Diana; Loebus, Axel; Kelleher, Susan M.; Fischer, Anna; Lensen, Marga C.

doi:10.1039/c3tc30811a

Cited by 9 publications

(11 citation statements)

References 30 publications

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“…Taking advantage of the metal cation affinity of the P4VP core, the PS‐ b ‐P4VP polymer micelles could easily be loaded with variable amounts of HAuCl 4 ·3H 2 O. As evidenced by SAXS, 0.2, 0.3, and even 0.6 equivalents of HAuCl 4 ·3H 2 O per pyridine unit could be loaded within the P4VP core affecting neither the micellar shape nor size (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Hydrophobic Nanoreactor Soft‐Templating: A Supramolecular Approach to Yolk@Shell Materials

Guiet

Göbel

Klingan

et al. 2015

Adv Funct Materials

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wileyonlinelibrary.comin the fi elds of heterogeneous catalysis, [1][2][3][4] electrocatalysis, [ 2,5,6 ] gas sensing, [ 7,8 ] battery development, [ 9,10 ] and drug delivery. [ 5,11 ] Yolk@shell materials are composed of single (or multiple) nanoscaled cores of a material A encapsulated inside a hollow nanosphere of a material B (A@void@B, in short A@B). Depending on the envisioned application, the surrounding hollow shell can be dense or porous (permeable) allowing control of the interactions between the core and the outer environment.For many applications, it has been shown that yolk@shell nanocomposites feature enhanced properties as a result of their unique structure on the nanometer scale. In the fi eld of heterogeneous catalysis for example, it has been demonstrated that supported metal nanoparticle (M NP ) catalysts with a yolk@shell structure are highly resistant against temperature and/or reaction induced M NP sintering, thus preserving the catalysts activity. As such, a variety of yolk@shell nanocatalysts have been designed, including M NP @carbon, [12][13][14] M NP @silica, [ 2,15 ] Au NP @TiO 2 , [ 16 ] and Au NP @ZrO 2 , [ 17,18 ] all superior in terms of catalytic activity and stability when compared to their non-yolk@shell counterparts.Despite their proven potential, the application of yolk@shell structures remains however limited due to challenging and Due to their unique morphology-related properties, yolk@shell materials are promising materials for catalysis, drug delivery, energy conversion, and storage. Despite their proven potential, large-scale applications are however limited due to demanding synthesis protocols. Overcoming these limitations, a simple softtemplated approach for the one-pot synthesis of yolk@shell nanocomposites and in particular of multicore metal nanoparticle@metal oxide nanostructures (M NP @MO x ) is introduced. The approach here, as demonstrated for Au NP @ ITO TR (ITO TR standing for tin-rich ITO), relies on polystyrene-block -poly(4vinylpyridine) (PS-b -P4VP) inverse micelles as two compartment nanoreactor templates. While the hydrophilic P4VP core incorporates the hydrophilic metal precursor, the hydrophobic PS corona takes up the hydrophobic metal oxide precursor. As a result, interfacial reactions between the precursors can take place, leading to the formation of yolk@shell structures in solution. Once calcined these micelles yield Au NP @ITO TR nanostructures, composed of multiple 6 nm sized Au NPs strongly anchored onto the inner surface of porous 35 nm sized ITO TR hollow spheres. Although of multicore nature, only limited sintering of the metal nanoparticles is observed at high temperatures (700 °C). In addition, the as-synthesized yolk@shell structures exhibit high and stable activity toward CO electrooxidation, thus demonstrating the applicability of our approach for the design of functional yolk@shell nanocatalysts.

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Section: Resultsmentioning

confidence: 99%

Hydrophobic Nanoreactor Soft‐Templating: A Supramolecular Approach to Yolk@Shell Materials

Guiet

Göbel

Klingan

et al. 2015

Adv Funct Materials

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“…Integration times of 22 ms per spectrum and averaging of 50 spectra per data set were used to optimize the signal-to-noise ratio. Data analysis was performed using custom-built MATLAB script 19 performed on spectra to extract three characteristic parameters describing the LSPR peak: the optical density (OD), the full width at half-maximum (FWHM), and the resonant wavelength (by calculating the centroid of the peak above the region marked by the FWHM). The value of the centroid has been shown to track linearly with the LSPR peak while providing an improved signal-to-noise ratio.…”

Section: Methodsmentioning

confidence: 99%

“…The size, shape, and charge of a nanoparticle alters its intrinsic optical properties but also effects how that nanoparticle assembles to varying densities in the presence of a dielectric coating. 11 The synthesis and control over particle shape and size has been significantly improved in the past few years with shapes including spheres, 12, 13 rods, 14–16 platelets, 17, 18 cages, 19 polyhedrons, 20 and stars 21 now demonstrated. A number of studies have looked at the optical effects caused by changes in the refractive index (RI), including our recent study using the localized surface plasmon resonance of GNPs to monitor lipid membrane assembly and protein binding.…”

Section: Introductionmentioning

confidence: 99%

Polymer mediated layer-by-layer assembly of different shaped gold nanoparticles

Budy

Hamilton

Cai

et al. 2017

Journal of Colloid and Interface Science

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Gold nanoparticles (GNPs) have a wide range of properties with potential applications in electronics, optics, catalysis, and sensing. In order to demonstrate that dense, stable, and portable samples could be created for these applications, multiple layers of GNPs were assembled via drop casting on glass substrates by layer-by-layer (LBL) techniques. Two cationic polyelectrolytes, poly(diallyldimethylammonium chloride) and polyethyleneimine, one anionic polyelectrolyte, poly(sodium 4-styrene sulfonate), and one neutral polymer, polyvinylpyrrolidone, were combined with four different shapes of GNPs (spherical, rod, triangular prismatic, and octahedral) to prepare thin films. A subset of these polymer nanoparticle combinations were assembled into thin films. Synthesized GNPs were characterized via dynamic light scattering, UV-vis spectroscopy, and transmission electron microscopy and the LBL thin films were characterized using UV-vis spectroscopy and atomic force microscopy. Sensing applications of the nanoparticles in solution and thin films were tested by monitoring the localized surface plasmon resonance of the GNPs. LBL thin films were prepared ranging from 25 to 100 layers with optical densities at plasmon from 0.5 to 3.0. Sensitivity in solutions ranged from 14 to 1002 nm/RIU and films ranged from 18.8 to 135.1 nm/RIU suggesting reduced access to the GNPs within the films.

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“…After UV curing, the PDMS mold was removed, leaving an ordered pattern of PEG micro-stripes on the Au NPs-layered silicon wafer. This step, which we previously denoted "adhesive embossing" [57], is basically what Whitesides et al coined MIMIC [58].…”

Section: Wet Micro-contact Deprintingmentioning

confidence: 94%

“…In addition, we have fabricated unique, hybrid hierarchical patterns, in which we "glued" micrometer-sized bars of PEG hydrogels onto the micro-patterns of Au NPs [57]. This was achieved by what we call "adhesive embossing," which is basically similar to the MIMIC method as developed by Whitesides [58,59].…”

Section: Micro-and Nano-patterning Methodsmentioning

confidence: 99%

Nano- and Micro-Patterning of Gold Nanoparticles on PEG- Based Hydrogels for Controlling Cell Adhesion

Yesildag¹,

Zhang²,

Ren³

et al. 2018

Noble and Precious Metals - Properties, Nanoscale Effects and Applications

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Gold nanoparticles (Au NPs) have unique and tunable size-and shape-dependent optical and chemical properties and little toxicity. In this chapter, we describe results on Au NPs employed as cell-binding entities at biomaterials' interfaces. Hereby, Au NPs with different sizes and shapes were nano-or micro-patterned on the surface of poly(ethylene glycol) (PEG)-based hydrogels by using our recently developed patterning strategies based on soft lithography. These hybrid biomaterials can be applied in various biological or biomedical applications, such as for fundamental cell studies considering adhesion and migration, tissue engineering, drug delivery, or as biosensors by using surface plasmon resonance (SPR) or surface-enhanced Raman spectroscopy (SERS).

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Hybrid hierarchical patterns of gold nanoparticles and poly(ethylene glycol) microstructures

Cited by 9 publications

References 30 publications

Hydrophobic Nanoreactor Soft‐Templating: A Supramolecular Approach to Yolk@Shell Materials

Hydrophobic Nanoreactor Soft‐Templating: A Supramolecular Approach to Yolk@Shell Materials

Polymer mediated layer-by-layer assembly of different shaped gold nanoparticles

Nano- and Micro-Patterning of Gold Nanoparticles on PEG- Based Hydrogels for Controlling Cell Adhesion

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