A convenient phase transfer protocol to functionalize gold nanoparticles with short alkylamine ligands

Yang, Guang; Chang, Wen‐Sheng; Hallinan, Daniel T.

doi:10.1016/j.jcis.2015.08.054

Cited by 24 publications

(31 citation statements)

References 50 publications

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“…Detailed description of the analysis is given in the Supporting Information. The average surface area of an AuNP is 507 nm 2 (using a previously reported value for the radius of 6.35 nm) . Thus, the grafting density, σ, is easily calculated, as is the reduced grafting density, σ*, which is scaled by b 2 .…”

Section: Resultsmentioning

confidence: 99%

“…This value increases with increasing PEO M N , which is denoted in the figure. The edge‐to‐edge distance, d , between particles is the difference between the center‐to‐center distance from Figure and two AuNP radii, 2 r 0 = 12.7 ± 1.2 . In Figure , d is reported (in a log–log plot) as a function of the degree of polymerization, N , for AuNPs self‐assembled from solvents noted in the legend.…”

Section: Resultsmentioning

confidence: 99%

“…In previous work, AuNPs used in this study were synthesized and characterized . In the same study, the expertise for simultaneous phase transfer and ligand exchange is developed.…”

Section: Methodsmentioning

confidence: 99%

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Scaling Laws for Polymer Chains Grafted onto Nanoparticles

Yang

Kim

Wang

et al. 2018

Macro Chemistry & Physics

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An experimental approach is presented for identifying the scaling laws for polymer chains grafted onto gold nanoparticles. Poly(ethylene oxide) of various molecular weights are grafted onto gold nanoparticles via thiol end‐functional groups. The polymer‐grafted nanoparticles are self‐assembled into monolayers from solvents of different quality. Over a significant range of graft densities, nanoparticle monolayers deposited from good (athermal) solvent exhibit particle spacing that scales according to theoretical predictions for chains in dilute solution. This unexpected result for ordered nanoparticle monolayers is discussed in the context of the deposition process. In monolayers deposited from theta solvent, molecular weight scaling of particle spacing breaks down, possibly due to chain length dependence of solvent quality. In poor solvent, the structure of nanoparticle assemblies is not sufficiently ordered to obtain reliable measurements, possibly due to loss of nanoparticle dispersion. This approach opens up the possibility for accurate measurement of the effect of solvent on grafted chain scaling in nanoparticle assemblies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Scaling Laws for Polymer Chains Grafted onto Nanoparticles

Yang

Kim

Wang

et al. 2018

Macro Chemistry & Physics

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“…Indirect techniques for nanosystem characterization are absorption (ultra violet and visible (UV-vis) spectroscopy) and various scattering methods: quasi-elastic light scattering (QELS), X-rays, or neutron scattering. The techniques that become of greatest relevance to nanoscience are small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) [ 5 , 6 ]. The advantage of those techniques is that they are able to characterize large numbers of nanoparticles and often do not require any particular sample preparation.…”

Section: Introductionmentioning

confidence: 99%

SAXS Combined with UV-vis Spectroscopy and QELS: Accurate Characterization of Silver Sols Synthesized in Polymer Matrices

et al. 2016

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The present work demonstrates a validation of small-angle X-ray scattering (SAXS) combining with ultra violet and visible (UV-vis) spectroscopy and quasi-elastic light scattering (QELS) analysis for characterization of silver sols synthesized in polymer matrices. Polymer matrix internal structure and polymer chemical nature actually controlled the sol size characteristics. It was shown that for precise analysis of nanoparticle size distribution these techniques should be used simultaneously. All applied methods were in good agreement for the characterization of size distribution of small particles (less than 60 nm) in the sols. Some deviations of the theoretical curves from the experimental ones were observed. The most probable cause is that nanoparticles were not entirely spherical in form.

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“…Finally, the ligand exchange method involves the exchange of adsorbed ligands on NPs [28,29]. The main requirement and limitation of this method are that the final ligands should have a stronger affinity to the NPs surface compared to the initial ligands.…”

Section: Introductionmentioning

confidence: 99%

Versatile Phase Transfer Method for the Efficient Surface Functionalization of Gold Nanoparticles: Towards Controlled Nanoparticle Dispersion in a Polymer Matrix

Ranoszek-Soliwoda

Gîrleanu

Tkacz-Szczźsna

et al. 2016

Journal of Nanomaterials

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In electronic devices based on hybrid materials such as nonvolatile memory elements (NVMEs), it is essential to control precisely the dispersion of metallic nanoparticles (NPs) in an insulating polymer matrix such as polystyrene in order to control the functionality of the device. In this work the incorporation of AuNPs in polystyrene films is controlled by tuning the surface functionalization of the metallic nanoparticles via ligand exchange. Two ligands with different structures were used for functionalization: 1-decanethiol and thiol-terminated polystyrene. This paper presents a versatile method for the modification of gold nanoparticles (AuNPs) with thiol-terminated polystyrene ligands via phase transfer process. An organic colloid of AuNPs (5±1 nm diameter) is obtained by the phase transfer process (from water to toluene) that allows exchanging the ligand adsorbed on AuNPs surface (hydrophilic citrate/tannic acid to hydrophobic thiols). The stability, size distribution, and precise location of modified AuNPs in the polymer matrix are obtained from UV-Vis spectroscopy, dynamic light scattering (DLS), and electron tomography. TEM tomographic 3D imaging demonstrates that the modification of AuNPs with thiol-terminated polystyrene results in homogeneous particle distribution in the polystyrene matrix compared to 1-decanethiol modified AuNPs for which a vertical phase separation with a homogeneous layer of AuNPs located at the bottom of the polymer matrix was observed.

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A convenient phase transfer protocol to functionalize gold nanoparticles with short alkylamine ligands

Cited by 24 publications

References 50 publications

Scaling Laws for Polymer Chains Grafted onto Nanoparticles

Scaling Laws for Polymer Chains Grafted onto Nanoparticles

SAXS Combined with UV-vis Spectroscopy and QELS: Accurate Characterization of Silver Sols Synthesized in Polymer Matrices

Versatile Phase Transfer Method for the Efficient Surface Functionalization of Gold Nanoparticles: Towards Controlled Nanoparticle Dispersion in a Polymer Matrix

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