Impact of the Crosslinker’s Molecular Structure on the Aggregation of Gold Nanoparticles

Deffner, Michael; Schulz, Florian; Lange, Holger

doi:10.1515/zpch-2016-0865

Cited by 6 publications

(7 citation statements)

References 35 publications

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“…The phase transfer with OLAM is straightforward and reproducible. It is possible to concentrate AuNP in the toluene phase by replacing the water with fresh AuNP@Citrate in water after complete phase transfer . Up to ten repetitions were performed and reproducibly yielded AuNP@OLAM with the expected 10-fold concentration of the AuNP@Citrate as tested with 6.4 and 12.3 nm AuNP (Figure a–d).…”

Section: Resultsmentioning

confidence: 88%

“…with fresh AuNP@Citrate in water after complete phase transfer. 50 Up to ten repetitions were performed and reproducibly yielded AuNP@OLAM with the expected 10fold concentration of the AuNP@Citrate as tested with 6.4 and 12.3 nm AuNP (Figure 1a−d).…”

Section: Resultsmentioning

confidence: 89%

“…In previous studies we observed the kinetics of ligand exchange of small thiols vs OLAM to depend on the OLAM concentration. 50 We tested the effect of OLAM concentration with 6 and 12 nm AuNP. The experiments are shown in Figures S3 and S4.…”

Section: Resultsmentioning

confidence: 99%

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Size-Dependent Phase Transfer Functionalization of Gold Nanoparticles To Promote Well-Ordered Self-Assembly

2017

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We present a route for the functionalization of gold nanoparticles (AuNP) based on phase transfer functionalization in order to optimize the stability and the potential for self-assembly. Depending on the desired size, different ligand exchanges have to be employed: The maximum AuNP size that can be stabilized without concentration loss is 46 nm for polystyrene-based ligands with 5 and 10 kDa. Small particles <12 nm are better stabilized by smaller ligands. We are able to demonstrate that well-ordered close-packed monolayers of 28 nm AuNP covering at least 400 μm are possible with a potential for much larger areas. Such monolayers are of great interest for various fundamental experiments in the context of plasmonics and SERS and for sensor applications.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 89%

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Size-Dependent Phase Transfer Functionalization of Gold Nanoparticles To Promote Well-Ordered Self-Assembly

2017

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“…They obtained superclusters of NPs by drop‐casting on TEM grids. Deffner et al studied the kinetics of aggregation of AuNPs functionalized with hydrophobic dithiols in water and organic solvents, but did not report on the fine structure of the aggregates. Others have shown the formation of spherical AuNP assemblies with dithiol crosslinkers and there has been some effort toward tuning the functional properties of NP assemblies by tuning the length of the dithiol linkers .…”

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confidence: 99%

Ordered Networks of Gold Nanoparticles Crosslinked by Dithiol‐Oligomers

Nayak

Horst

Zhang

et al. 2018

Part & Part Syst Charact

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Controlled aggregation of nanoparticles into superlattices is a grand challenge in material science, where ligand based self‐assembly is the dominant route. Here, the self‐assembly of gold nanoparticles (AuNPs) that are crosslinked by water soluble oligo‐(ethylene glycol)‐dithiol (oEG‐dithiol) is reported and their 3D structure by small angle X‐ray scattering is determined. Surprisingly, a narrow region is found in the parameter space of dithiol linker‐length and nanoparticle size for which the crosslinked networks form short‐ranged FCC crystals. Using geometrical considerations and numerical simulations, the stability of the formed lattices is evaluated as a function of dithiol length and the number of connected nearest‐neighbors, and a phase diagram of superlattice formation is provided. Identifying the narrow parameter space that allows crystallization facilitates focused exploration of linker chemical composition and medium conditions such as thermal annealing, pH, and added solutes that may lead to superior and more robust crystals.

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“…In this respect, a coupling of the nanoparticles detunes the resonance and spectroscopy can be correlated with the formation of super-structures. In their study, Holger Lange and co-workers investigate the agglomeration of gold nanoparticles in different solvents and using different linker molecules to heap-like or chain-like structures by comparison of UV-vis spectroscopy, dynamics light scattering, and transmission electron microscopy [2]. The knowledge about the aggregation of nanoparticles can guide the synthesis of defined, complex structures which could be -2-exploited for plasmon-based sensing.…”

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confidence: 99%

Hierarchical Colloidal Nanostructures – from Fundamentals to Applications

Klinke

2016

Zeitschrift Für Physikalische Chemie

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In order for our society to stay competitive in terms of computing power, sensing, and alternative energy new materials are required. Material science is one of the pillars of innovation in modern culture. In respect of future optical and electrical applications there is a need for active components with higher efficiencies and lower costs. Nanostructured materials such as nanoparticles, nanowires, carbon nanotubes, graphene and nanosheets are considered to be among the most promising candidates for faster and less expensive electronic devices and more efficient solar cells and fuel cells. This is mostly due to their low-dimensional nature which opens new intriguing possibilities for technology. The synthesis of inorganic nanostructures defined by colloidal chemistry has developed strongly and became a versatile tool in various fields of application: Colloidal nanoparticles are used as fluorescence markers in medicine and biology and in the latest generation of TV sets semiconducting nanoparticles are used in the background illumination systems, which demonstrates the bright future of colloidal nanomaterials. Further, colloidal nanostructures of various dimensionality and hierarchy can be used as inexpensive transistors, photo-detectors, chemical sensors, thermoelectric materials and as solar cells. Exciting properties include Coulomb blockade, adjustable electric transport, blinking, and continuously tunable optical properties. In order to produce nanomaterials with new, tailored properties it is indispensable to understand the mechanisms of synthesis, the optical processes and the electrical transport in detail.In this issue of Zeitschrift für Physikalische Chemie a representative crosssection of researchers active in Germany or with close relations report on their interesting, recent results in synthesis, assembly, and characterization. In the first contribution, the group of Victor Puntes demonstrates a simple room-temperature approach for the synthesis of gold nanoparticles and how to gain control over size

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Impact of the Crosslinker’s Molecular Structure on the Aggregation of Gold Nanoparticles

Cited by 6 publications

References 35 publications

Size-Dependent Phase Transfer Functionalization of Gold Nanoparticles To Promote Well-Ordered Self-Assembly

Size-Dependent Phase Transfer Functionalization of Gold Nanoparticles To Promote Well-Ordered Self-Assembly

Ordered Networks of Gold Nanoparticles Crosslinked by Dithiol‐Oligomers

Hierarchical Colloidal Nanostructures – from Fundamentals to Applications

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