Labeling: Small 2/2009

Yang, Miaoxin; Chen, Tao; Lau, Wei Siang; Wang, Yong; Tang, Qinghu; Yang, Yanhui; Chen, Hongyu

doi:10.1002/smll.200990006

Cited by 14 publications

(21 citation statements)

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“…The change in interparticle distance affected the plasmon coupling between AuNPs, further confirmed by surface-enhanced Raman scattering results (see Fig S15). 52 To gain more insight into the self-assembly behavior of charged ACMs, the morphological transitions were systematically investigated by varying the contents of -COOH groups and pHs (Fig 3). The boundaries of a phaselike diagram clearly suggest that, when fewer -COOH groups were present in the polymers and at a lower assembly solution pH, multi-line chains containing side-to-side aggregates were favorable; while, higher pHs and more -COOH content result in end-to-end aggregates and unimolecular micelles.…”

Section: Resultsmentioning

confidence: 99%

pH-programmable self-assembly of plasmonic nanoparticles: hydrophobic interaction versus electrostatic repulsion

Kanyó

Kuo

et al. 2015

Nanoscale

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We report a general strategy to conceptualize a new design for the pH-programmable self-assembly of plasmonic gold nanoparticles (AuNPs) tethered by random copolymers of poly(styrene-co-acrylic acid) (P(St-co-AA)). It is based on using pH as an external stimulus to reversibly change the surface charge of polymer tethers and to control the delicate balance of interparticle attractive and repulsive interactions. By incorporating -COOH moieties locally within PSt hydrophobic segments, the change in the ionization degree of -COOH moieties can dramatically disrupt the hydrophobic attraction within a close distance. pH acts as a key parameter to control the deprotonation of -COOH moieties and "programs" the assembled nanostructures of plasmonic nanoparticles in a stepwise manner. At a higher solution pH where -COOH groups of polymer tethers became highly deprotonated, electrostatic repulsion dominated the self-assembly and favored the formation of end-to-end, anisotropic assemblies, e.g. 1-D single-line chains. At a lower pH, the less deprotonated -COOH groups led to the decrease of electrostatic repulsion and the side-to-side aggregates, e.g. clusters and multi-line chains of AuNPs, became favorable. The pH-programmable self-assembly allowed us to engineer a "manual" program for a sequential self-assembly by changing the pH of the solution. We demonstrated that the two-step pH-programmable assembly could generate more sophisticated "multi-block" chains using two differently sized AuNPs. Our strategy offers a general means for the programmable design of plasmonic nanoparticles into the specific pre-ordained nanostructures that are potentially useful for the precise control over their plasmon coupling.

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Section: Resultsmentioning

confidence: 99%

pH-programmable self-assembly of plasmonic nanoparticles: hydrophobic interaction versus electrostatic repulsion

Kanyó

Kuo

et al. 2015

Nanoscale

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“…Fabrication of elemental metals into 2D nanostructures could not only maintain their high conductivity, but also endow distinctive properties compared to bulk materials, such as a stretchable mechanical property, unique optical properties, enhanced catalytic properties, and so on. So far, noble metals, such as Au, Ag, Pd, Rh, Pt, have been prepared into freestanding 2D nanostructures through surfactant‐assisted synthesis strategies. Au nanosheets with large lateral sizes (about 20 μm) have been prepared using L‐arginine as a capping agent .…”

Section: Intrinsic Metallic Two‐dimensional Nanomaterialsmentioning

confidence: 99%

“…The multilayer films assembled from Au nanosheets were able to be used as stretchable patterned electrodes, which exhibited excellent electrical stability during stretching cycles. Pd nanosheets smaller than 10 nm have been synthesized in co‐solvents of water and organic solutions via reaction between palladium (II) acetylacetonate, poly(vinylpyrrolidone) (PVP), and sodium bromide . The as‐obtained Pd nanosheets had strong optical absorption and highly efficient photothermal conversion (52%) upon 808 nm irradiation, showing great potential for cancer therapy.…”

Section: Intrinsic Metallic Two‐dimensional Nanomaterialsmentioning

confidence: 99%

Regulating the Electrical Behaviors of 2D Inorganic Nanomaterials for Energy Applications

Feng

et al. 2014

Small

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Recent years have witnessed great developments in inorganic 2D nanomaterials for their unique dimensional confinement and diverse electronic energy bands. Precisely regulating their intrinsic electrical behaviors would bring superior electrical conductivity, rendering 2D nanomaterials ideal candidates for active materials in electrochemical applications when combined with the excellent reaction activity from the inorganic lattice. This Concept focuses on highly conducting inorganic 2D nanomaterials, including intrinsic metallic 2D nanomaterials and artificial highly conductive 2D nanomaterials. The intrinsic metallicity of 2D nanomaterials is derived from their closely packed atomic structures that ensure maximum overlapping of electron orbitals, while artificial highly conductive 2D nanomaterials could be achieved by designed methodologies of surface modification, intralayer ion doping, and lattice strain, in which atomic-scale structural modulation plays a vital role in realizing conducting behaviors. Benefiting from fast electron transfer, high reaction activity, as well as large surface areas arising from the 2D inorganic lattice, highly conducting 2D nanomaterials open up prospects for enhancing performance in electrochemical catalysis and electrochemical capacitors. Conductive 2D inorganic nanomaterials promise higher efficiency for electrochemical applications of energy conversion and storage.

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“…[3][4][5][6] A particular advantage is the extremely high spectral multiplexing capacity, that is, the ability to spectrally differentiate many labels within only a single measurement due to the small linewidth of vibrational Raman bands. Different shell types, including (bio)polymers [13,14] and silica, [12,[15][16][17][18] have been reported. A complete self-assembled monolayer (SAM) of Raman reporters provides maximum signal levels combined with reproducible Raman signatures due to the uniform orientation of the reporters within the SAM.…”

Section: Introductionmentioning

confidence: 99%

Direct Silica Encapsulation of Self‐Assembled‐Monolayer‐Based Surface‐Enhanced Raman Scattering Labels with Complete Surface Coverage of Raman Reporters by Noncovalently Bound Silane Precursors

Schütz

Salehi

Schlücker

2014

Chemistry An Asian Journal

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Silica-coated surface-enhanced Raman scattering (SERS) labels with a self-assembled monolayer (SAM) on the entire surface of the metal colloid combine high chemical and mechanical stability with bright and reproducible Raman signals due to the complete surface coverage and uniform molecular orientation within the SAM. Currently available chemical syntheses are either based on the direct encapsulation of covalently bound silane precursors or comprise several steps, such as the sequential addition of noncovalently bound polyelectrolytes to render the surface vitreophilic. Here, a generic approach for the direct and fast silica encapsulation of commercially available Raman reporter molecules with polar head groups by noncovalently bound silane precursors is reported. The formation of highly SERS-active silica-coated clusters during silica encapsulation is determined by several parameters, in particular the type of Raman reporter molecule, the solvent, and the type and amount of the silane precursor.

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Labeling: Small 2/2009

Cited by 14 publications

References 0 publications

pH-programmable self-assembly of plasmonic nanoparticles: hydrophobic interaction versus electrostatic repulsion

pH-programmable self-assembly of plasmonic nanoparticles: hydrophobic interaction versus electrostatic repulsion

Regulating the Electrical Behaviors of 2D Inorganic Nanomaterials for Energy Applications

Direct Silica Encapsulation of Self‐Assembled‐Monolayer‐Based Surface‐Enhanced Raman Scattering Labels with Complete Surface Coverage of Raman Reporters by Noncovalently Bound Silane Precursors

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