Smart core/shell nanocomposites: Intelligent polymers modified gold nanoparticles

Li, Dongxiang; He, Qiang; Li, Junbai

doi:10.1016/j.cis.2008.12.007

Cited by 250 publications

(164 citation statements)

References 115 publications

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“…In the case of polymeric coatings, many classifi cations are possible, due to the large variety of molecular designs existing for polymers. We decided to categorize the polymer coatings according to the binding architecture of the polymers onto the gold surface, namely: 1) physical adsorption of polymers (polyelectrolytes) in a patchy structure or in a layer-by-layer (LbL) organization; 2) one-end covalent binding in polymer brush structure [51] ; and 3) crosslinked polymer microgels [52,53] . In the following sub-sections, the main chemical and physical differences between these mole cules will be highlighted, as well as their effect on the optical properties of the nanoparticles, based on their infl uence on particle size and shape, aggregation-and assembly-states (ordered or disordered aggregation), during and after the particle synthesis.…”

Section: Organic Coatingsmentioning

confidence: 99%

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Chanana¹,

Liz‐Marzán²

2012

Nanophotonics

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An essential element in the synthesis of nanomaterials based on gold nanoparticles comprises the control over parameters such as size, shape and composition, due to their strong infl uence on the properties of the particles. However, it is the coating material which often plays the primary role in tuning the size, morphology, and even plasmon resonance wavelength or mode multiplicity, as well as colloidal stability and functional versatility, ultimately determining the physical, chemical, optical, electronic and catalytic properties of the nanoparticles. Therefore, it is utterly important to select the adequate wet chemistry synthetic approach with the most suitable coating material for the preparation of gold nanoparticles with the desired requirements. Within this context, this review is focused on describing various types of organic and inorganic coating materials for gold nanoparticles that may notably affect their optical properties by either directly infl uencing the synthesis procedure or by changing their chemical and physical properties upon post-synthetic modifi cations, such that they exhibit novel and useful optical properties.

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Section: Organic Coatingsmentioning

confidence: 99%

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Chanana¹,

Liz‐Marzán²

2012

Nanophotonics

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“…[52] The especially well defined samples selected for this task were already listed in Table 5.3. RAFT polymers are often used in this context [53,54] because RAFT groups can easily be reduced to thiols-the most prominent group for linkage to gold surfaces. [55][56][57][58][59] But this transformation is not even necessary in most cases because the RAFT groups themselves can function as anchors for the AuNPs (see Figure 8.1).…”

Section: Grafting Of Polymers With Trithiocarbonate Groups To Citratementioning

confidence: 99%

Nanohybrids of Gold Particles

Ebeling

2015

Springer Theses

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The design and the characterization of the substrate components for this chapter, gold nanocrystals from the ex-situ two-phase Brust-Schiffrin synthesis and from reduction with citrate ions ci Au ν-3 , were described in Section 5.1. In the following, it will be outlined how these AuNPs can be functionalized with non-polymeric ligands of different types for stabilization and introduction of functional groups, especially hydroxyl and azido moieties, to which RAFT agents with complementary functionalities could then be coupled, and how they can be coated with the NIPAm RAFT polymers prepared in Section 5.4. Hereby, the binding motifs of ligands bearing trithiocarbonate groups will be the particular focus. Different ligands on AuNPs Functionalization of Brust-Schiffrin gold nanocrystalsAuNPs prepared by the ex-situ two-phase Brust-Schiffrin method were presented and their ligand-independent properties were characterized in Section 5.1.3.3 (also see Table 5.2, Section 5.1.5). These nanocrystals are very well suited for functionalization reactions for three major reasons:• The weakly bound tetraoctylammonium bromide is readily replaced by all ligands that form stronger bonds to the gold surface.• The sodium borohydride can be completely washed off prior to the addition of the ligand, so that even very reduction-sensitive molecules can be used.• The arising particle size and shape characteristics are independent of the employed ligand, enabling comparative experiments with different functionalization agents.

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“…[9,10] AuNPs have been widely used for the preparation of smart, photoresponsive materials, because they can be easily obtained with ar elatively homogeneouss ize distribution in the range from af ew to hundreds of nanometers. [11][12][13] Previously, variousresearch groups have attached MPc, [14][15][16][17] includingsubstitutedZ nPc, [18][19][20][21][22][23][24][25] to AuNPs for different purposes, such as the preparation of sensors, [26][27][28] photoelectrodes, for the generation of singlet oxygen, anda sp hotoactive agents forp hotodynamic therapy.T he combination of the light absorption and emissionp roperties of MPcs with the properties of the AuNPs, including morphology,e lectron confinement, and the existence of surfacep lasmon, is responsible for the emission quenching and the increased efficiency of singlet-oxygen generationo ft hese hybrid materials. [18][19][20][21][22][23][24][25] Herein, we report the photophysical behavior of as olidm aterial containing ZnPc attached covalently to as ilica matrix embedding AuNPs in comparison with the photoresponse of the conjugate in which ZnPc has been attachedd irectly to the AuNPs.…”

Section: Introductionmentioning

confidence: 99%

Phthalocyanine–Gold Nanoparticle Hybrids: Modulating Quenching with a Silica Matrix Shell.

et al. 2016

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An asymmetrically substituted zinc phthalocyanine (ZnPc) with a terminal dithiolane group is anchored to Au nanoparticles (NPs) directly or through an interposed silica matrix. Transient absorption spectroscopy shows that the quenching of the ZnPc excited state by AuNPs occurs through a photoinduced electron transfer, the efficiency of which is modulated by the presence of the insulating silica matrix.

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Smart core/shell nanocomposites: Intelligent polymers modified gold nanoparticles

Cited by 250 publications

References 115 publications

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Nanohybrids of Gold Particles

Phthalocyanine–Gold Nanoparticle Hybrids: Modulating Quenching with a Silica Matrix Shell.

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