Silica-coated Au/Ag nanorods with tunable surface plasmon bands for nanoplasmonics with single particles

Wu, Shuang; Schell, Andreas W.; Lublow, Michael; Kaiser, Julian; Aichele, Thomas; Schietinger, Stefan; Polzer, Frank; Kühn, Sergei; Guo, Xuhong; Benson, Oliver; Ballauff, Matthias; Lü, Yan

doi:10.1007/s00396-012-2760-5

Cited by 14 publications

(11 citation statements)

References 43 publications

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“…However, the size-and shape-dependent catalytic properties of the nanoparticles made by most of these techniques are oen obscured by broad size and shape distributions. [7][8][9][10] For heterogeneous catalysis, different types of surface sites such as corner, edge and facet can lead to signicant diversities even from the same type of nanoparticle. [11][12][13][14][15][16] For instance, some works have proved that Au nanoparticles with smaller diameters were more susceptible to dynamic catalytic surface restructuring due to their higher surface energies.…”

Section: Introductionmentioning

confidence: 99%

Laser illumination-induced dramatic catalytic activity change on Au nanospheres

Wei

Xiao

et al. 2019

Chem. Sci.

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Section: Introductionmentioning

confidence: 99%

Laser illumination-induced dramatic catalytic activity change on Au nanospheres

Wei

Xiao

et al. 2019

Chem. Sci.

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“…This provides the opportunity to investigate the aggregates with vacuum-based methods such as electron spectroscopy. Furthermore, the silica shell should provide a base for further functionalization of the aggregates that allows the investigation of optical properties that are due to distance-dependent interactions with a substrate, such as energy transfer, similar to studies of plasmon effects along metal nanowires [39,40].…”

Section: Discussionmentioning

confidence: 99%

Individual tubular J-aggregates stabilized and stiffened by silica encapsulation

et al. 2020

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Amphiphilic cyanine dyes in aqueous solution self-assemble into J-aggregates with diverse structures. In particular, the dye 3,3′-bis(3-sulfopropyl)-5,5′,6,6′-tetrachloro-1,1′-dioctylbenzimida-carbo-cyanine (C8S3) forms micrometer long double walled tubular J-aggregates with a uniform outer diameter of 13 ± 0.5 nm. Interestingly, these J-aggregates exhibit strong exciton delocalization and migration, similar to natural light harvesting systems. However, their structural integrity and hence their optical properties are very sensitive to their chemical environment as well as to mechanical deformation, rendering detailed studies on individual tubular J-aggregates difficult. We addressed this issue and examined a previously published route for their chemical and mechanical stabilization by in situ synthesis of a silica coating that leaves their absorbance and emission unaltered in solution. Here, we demonstrate that the silica shell with a thickness of a few nanometers is able to stabilize the tubular J-aggregates of C8S3 against changes of pH of solutions down to values where pure aggregates are oxidized, against drying under ambient conditions, and even against the vacuum conditions within an electron microscope. Dried silica–covered aggregates are brittle, as demonstrated by manipulation with a scanning force microscope on a surface. Transmission electron microscope images confirm that the thickness of the coatings is homogeneous and uniform with a thickness of less than 5 nm; scanning TEM energy dispersive X-ray spectroscopy confirms the chemical composition of the shell as SiO2; and electron energy loss spectra could be recorded across a single freely suspended aggregate. Such a silica shell may not only serve for stabilization but also could be the base for further functionalization of the aggregates by either chemical attachment of other units on top of the shell or by inclusion during the synthesis.

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“…25 Figure 1 shows SEM images of the precursor Au NRs (Fig. 1a), TEM images of hybrid Au/Ag NRs (Fig.…”

Section: Resultsmentioning

confidence: 99%

Sensitive and Simple Detection of Glucose Based on Single Plasmonic Nanorod

Zhu

Pang

2017

ANAL. SCI.

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A simple and sensitive method to determinate glucose content was developed based on single plasmonic nanoparticles by conventional dark-field microscopy (DFM). An enzyme-responsive plasmonic Ag/Au bilayer of rods was designed and prepared. Their localized surface plasmon resonance (LSPR) could be tailored by the enzyme reaction of glucose oxidase (GOx) by finely tuning the morphology and plasmonic optical response of the hybrid nanostructure. It was found that the plasmon resonance scattering (PRS) spectra peak (λmax) shifted to longer wavelengths under enzyme reactions, and the degree of the shift were proportional to the content of glucose. This approach is convenient to study the local concentration of glucose in real time. Keywords

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Silica-coated Au/Ag nanorods with tunable surface plasmon bands for nanoplasmonics with single particles

Cited by 14 publications

References 43 publications

Laser illumination-induced dramatic catalytic activity change on Au nanospheres

Laser illumination-induced dramatic catalytic activity change on Au nanospheres

Individual tubular J-aggregates stabilized and stiffened by silica encapsulation

Sensitive and Simple Detection of Glucose Based on Single Plasmonic Nanorod

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