Plasmonic Focusing Reduces Ensemble Linewidth of Silver-Coated Gold Nanorods

Becker, Jan; Zins, Inga; Jakab, Árpád; Khalavka, Yuriy; Schubert, Olaf; Sönnichsen, Carsten

doi:10.1021/nl080720k

Cited by 158 publications

(185 citation statements)

References 30 publications

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“…AuNR synthesis and purification procedures were adopted elsewhere 53,54 . The resulting AuNRs were used as seeds for the growth of AuNR-Ag NPs according to the literature with some modifications 55 . In brief, 0.8 ml of purified AuNR solution was mixed with 2.4 ml of 3% polyvinyl pyrrolidone aqueous solution, after which freshly prepared ammoniacal silver nitrate (120 ml, 1 mM) was added to the mixture while stirring, followed by addition of ascorbic acid solution (120 ml, 10 mM).…”

Section: Methodsmentioning

confidence: 99%

Highly sensitive sulphide mapping in live cells by kinetic spectral analysis of single Au-Ag core-shell nanoparticles

et al. 2013

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Hydrogen sulphide (H 2 S) is a gaseous signalling agent that has important regulatory roles in many biological systems but remains difficult to measure in living biological specimens. Here we introduce a new method for highly sensitive sulphide mapping in live cells via singleparticle plasmonic spectral imaging that uses Au-Ag core-shell nanoparticles as probes. This strategy is based on Ag 2 S formation-induced spectral shifts of the nanoprobes, which is not only highly selective towards sulphide but also shows a linear logarithmic dependence on sulphide concentrations from 0.01 nM to 10 mM. A theoretical model was established that successfully explained the experimental observations, suggesting that the local sulphide concentration as well as its oscillations can be determined indirectly from kinetic measurements of the spectral shifts of the nanoprobes. We demonstrated for the first time the realtime mapping of local variations of sulphide levels in live cells with nM sensitivity.

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Section: Methodsmentioning

confidence: 99%

Highly sensitive sulphide mapping in live cells by kinetic spectral analysis of single Au-Ag core-shell nanoparticles

et al. 2013

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“…an effect observed by S ö nnichsen et al and termed as " plasmonic focusing " [203] . Furthermore, the blue-shifting effect of the silver shell with a certain thickness on the plasmon resonance of gold NRs is larger for longer nanorods than for shorter ones.…”

Section: Metallic Coatingsmentioning

confidence: 97%

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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“…Initially, spherical gold particles were used [14,17] but were soon replaced by gold nanorods [18] due to their higher sensitivity on refractive index changes [19]. A lot of effort has been applied towards identifying the ideal plasmon sensor with a large spectral shift for a given change in refractive index, for example, using rod-shaped gold nanorattles [20], metamaterials [21], silver-coated gold nanorods [22] and others. However, rod-shaped nanoparticles remain popular for plasmonic applications.…”

Section: Introductionmentioning

confidence: 99%

The Optimal Aspect Ratio of Gold Nanorods for Plasmonic Bio-sensing

et al. 2010

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The plasmon resonance of metal nanoparticles shifts upon refractive index changes of the surrounding medium through the binding of analytes. The use of this principle allows one to build ultra-small plasmon sensors that can detect analytes (e.g., biomolecules) in volumes down to attoliters. We use simulations based on the boundary element method to determine the sensitivity of gold nanorods of various aspect ratios for plasmonic sensors and find values between 3 and 4 to be optimal. Experiments on single particles confirm these theoretical results. We are able to explain the optimum by showing a corresponding maximum for the quality factor of the plasmon resonance.

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Plasmonic Focusing Reduces Ensemble Linewidth of Silver-Coated Gold Nanorods

Cited by 158 publications

References 30 publications

Highly sensitive sulphide mapping in live cells by kinetic spectral analysis of single Au-Ag core-shell nanoparticles

Highly sensitive sulphide mapping in live cells by kinetic spectral analysis of single Au-Ag core-shell nanoparticles

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

The Optimal Aspect Ratio of Gold Nanorods for Plasmonic Bio-sensing

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