Solution NMR techniques for investigating colloidal nanocrystal ligands: A case study on trioctylphosphine oxide at InP quantum dots

Moreels, Iwan; Martins, José; Hens, Zeger

doi:10.1016/j.snb.2006.12.026

Cited by 49 publications

(58 citation statements)

References 26 publications

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“…Also in these systems, binding dynamics and surface diffusion are found (Moreels et al 2007); the surface coverage may depend on the particle size and geometric shape of the ligand molecules involved (Bowen-Katari et al 1994). Besides TOP and/or TOPO, hexadecylamine or other amines are also commonly used ligands for CdSe quantum dots (Ji et al 2008), which can also be replaced by stronger binding molecules, e.g.…”

Section: (C) Ligand Exchangementioning

confidence: 99%

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Sperling

Parak

2010

Phil. Trans. R. Soc. A.

1,409

1,092

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Inorganic colloidal nanoparticles are very small, nanoscale objects with inorganic cores that are dispersed in a solvent. Depending on the material they consist of, nanoparticles can possess a number of different properties such as high electron density and strong optical absorption (e.g. metal particles, in particular Au), photoluminescence in the form of fluorescence (semiconductor quantum dots, e.g. CdSe or CdTe) or phosphorescence (doped oxide materials, e.g. Y 2 O 3 ), or magnetic moment (e.g. iron oxide or cobalt nanoparticles). Prerequisite for every possible application is the proper surface functionalization of such nanoparticles, which determines their interaction with the environment. These interactions ultimately affect the colloidal stability of the particles, and may yield to a controlled assembly or to the delivery of nanoparticles to a target, e.g. by appropriate functional molecules on the particle surface. This work aims to review different strategies of surface modification and functionalization of inorganic colloidal nanoparticles with a special focus on the material systems gold and semiconductor nanoparticles, such as CdSe/ZnS. However, the discussed strategies are often of general nature and apply in the same way to nanoparticles of other materials.

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Section: (C) Ligand Exchangementioning

confidence: 99%

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Sperling

Parak

2010

Phil. Trans. R. Soc. A.

1,409

1,092

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“…Only recently, important advances have been made in adapting techniques traditionally used for studies of molecules to characterization of NQD/solution interfaces in situ. Methods such as nuclear magnetic resonance (NMR) spectroscopy [12][13][14][15][16][17] and attenuated total refl ection Fourier transfer infrared spectroscopy (ATR-FTIR) [ 18 ] have been shown to be useful tools in studies of the NQD surface composition, ligand exchange dynamics as well as the NQD-surface-solution equilibrium. Very recently, several research groups have demonstrated that studies of NQD photoluminescence (PL), combined with an isotherm modeling of experimental data, can also provide information about the process of surface-ligand exchange.…”

Section: Electronic Properties and Structure Of Assemblies Of Cdse Namentioning

confidence: 99%

Electronic Properties and Structure of Assemblies of CdSe Nanocrystal Quantum Dots and Ru‐Polypyridine Complexes Probed by Steady State and Time‐Resolved Photoluminescence

Koposov

Szymanski

Cardolaccia

et al. 2011

Adv Funct Materials

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Chemical and electronic interactions between CdSe nanocrystal quantum dots (NQDs) and Ru‐polypyridine complexes are studied in solution. It is shown that photoluminescence (PL) can be used to effectively monitor the formation of NQD‐complex assemblies in real time. It is also shown that with the aid of Langmuir isotherm modeling, the PL studies can be used to quantitatively characterize the composition of the assemblies and the strength of electronic interactions between their components. The approach demonstrated here is general and can be applied to other systems that combine semiconductor NQDs and appropriately functionalized organometallic or organic molecules interacting with NQDs via energy transfer, charge transfer, or other mechanisms leading to quenching of NQD emission.

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“…24-26 Furthermore, the presence of TOPO is presumed to lead to the 40 evolution of positive charge density on the particle surface by partial charge transfer to the particle bulk, resulting in the development of electrostatic repulsion. 27,28 Considering the rather low ionic strength and the long range of the electrostatic repulsion in the organic medium with a low dielectric constant, in 45 the present case the effect can be expected to be significant. Thus, a non-directional repulsive potential resulting from such partial charge separation may add to the steric repulsion stemming from the polymer, and can be associated with the decreased tendency for chain formation with increasing TOPO concentration.…”

Section: Resultsmentioning

confidence: 79%

Controlling the self-assembly of magnetic nanoparticles by competing dipolar and isotropic particle interactions

Hod

Dobbrow

Vaidyanathan

et al. 2014

Journal of Colloid and Interface Science

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Solution NMR techniques for investigating colloidal nanocrystal ligands: A case study on trioctylphosphine oxide at InP quantum dots

Cited by 49 publications

References 26 publications

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Surface modification, functionalization and bioconjugation of colloidal inorganic nanoparticles

Electronic Properties and Structure of Assemblies of CdSe Nanocrystal Quantum Dots and Ru‐Polypyridine Complexes Probed by Steady State and Time‐Resolved Photoluminescence

Controlling the self-assembly of magnetic nanoparticles by competing dipolar and isotropic particle interactions

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