Ideal Dimers of Gold Nanospheres for Precision Plasmonics: Synthesis and Characterization at the Single‐Particle Level for Identification of Higher Order Modes

Yoon, Jun Hee; Selbach, Florian; Langolf, Ludmilla; Schlücker, Sebastian

doi:10.1002/smll.201702754

Cited by 61 publications

(92 citation statements)

References 39 publications

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“…28,38 When the NSs within the clusters are closer to each other, a stronger degree of plasmon coupling can be expected, and higher order cluster modes appear at energies close to the single particle LSPR. These higher order cluster modes, which have been discussed in previous works, 28,38 can shift the peak to λ~560 nm. 22,39 The second region at higher wavelengths displays the most intense extinction peak and clearly red-shifts when increasing the lattice parameter of the assembly.…”

Section: Resultsmentioning

confidence: 99%

Gold Nanoparticle Plasmonic Superlattices as Surface-Enhanced Raman Spectroscopy Substrates

et al. 2018

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Metal colloids are of great interest in the field of nanophotonics, mainly due to their morphology-dependent optical properties, but also because they are high-quality building blocks for complex plasmonic architectures. Close-packed colloidal supercrystals not only serve for investigating the rich plasmonic resonances arising in strongly coupled arrangements but also enable tailoring the optical response, on both the nano- and the macroscale. Bridging these vastly different length scales at reasonable fabrication costs has remained fundamentally challenging, but is essential for applications in sensing, photovoltaics or optoelectronics, among other fields. We present here a scalable approach to engineer plasmonic supercrystal arrays, based on the template-assisted assembly of gold nanospheres with topographically patterned polydimethylsiloxane molds. Regular square arrays of hexagonally packed supercrystals were achieved, reaching periodicities down to 400 nm and feature sizes around 200 nm, over areas up to 0.5 cm. These two-dimensional supercrystals exhibit well-defined collective plasmon modes that can be tuned from the visible through the near-infrared by simple variation of the lattice parameter. We present electromagnetic modeling of the physical origin of the underlying hybrid modes and demonstrate the application of superlattice arrays as surface-enhanced Raman scattering (SERS) spectroscopy substrates which can be tailored for a specific probe laser. We therefore investigated the influence of the lattice parameter, local degree of order, and cluster architecture to identify the optimal configuration for highly efficient SERS of a nonresonant Raman probe with 785 nm excitation.

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Section: Resultsmentioning

confidence: 99%

Gold Nanoparticle Plasmonic Superlattices as Surface-Enhanced Raman Spectroscopy Substrates

et al. 2018

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“…Synthesis of Ultrasmooth Spherical AuNPs : Forty nanometer ultrasmooth spherical gold NPs were synthesized in a four‐step process . First Au 3+ ions were reduced to small gold clusters with NaBH 4 in cetyltrimethylammonium bromide (CTAB) solution.…”

Section: Methodsmentioning

confidence: 99%

DNA‐Mediated Self‐Assembly of Plasmonic Antennas with a Single Quantum Dot in the Hot Spot

Nicoli

Zhang

Hübner

et al. 2019

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DNA self‐assembly is a powerful tool to arrange optically active components with high accuracy in a large parallel manner. A facile approach to assemble plasmonic antennas consisting of two metallic nanoparticles (40 nm) with a single colloidal quantum dot positioned at the hot spot is presented here. The design approach is based on DNA complementarity, stoichiometry, and steric hindrance principles. Since no intermediate molecules other than short DNA strands are required, the structures possess a very small gap (≈ 5 nm) which is desired to achieve high Purcell factors and plasmonic enhancement. As a proof‐of‐concept, the fluorescence emission from antennas assembled with both conventional and ultrasmooth spherical gold particles is measured. An increase in fluorescence is obtained, up to ≈30‐fold, compared to quantum dots without antenna.

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“…The Au/Au core/satellite nanoparticles comprise a positively charged 50 nm gold nanosphere (core) with a smooth surface (AuNSs), coated with the linker molecule MUTAB and the Raman reporter MMC, as well as negatively charged 30 nm gold nanoparticles (satellites) (AuNP) . The assemblies are stabilized by a PEG shell (HS‐PEG‐COOH) to avoid non–specific binding of the SERS nanotags to cells.…”

Section: Materials and Methods/experimentalmentioning

confidence: 99%

Localization of PD‐L1 on single cancer cells by iSERS microscopy with Au/Au core/satellite nanoparticles

Stepula

König

Wang

et al. 2020

Journal of Biophotonics

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Programmed cell death‐ligand 1 (PD‐L1) is an important predictive biomarker. The detection of PD‐L1 can be crucial for patients with advanced cancer where the use of immunotherapy is considered. Here, we demonstrate the use of immuno‐SERS microscopy (iSERS) for localizing PD‐L1 on single cancer SkBr‐3 cells. A central advantage of iSERS is that the disturbing autofluorescence from cells and tissues can be efficiently minimized by red to near‐infrared laser excitation. In this study we employed Au/Au core/satellite nanoparticles as SERS nanotags because of their remarkable signal brightness and colloidal stability upon red laser excitation. False‐color iSERS images of the positive and negative controls clearly reveal the specific localization of PD‐L1 with SERS nanotag‐labeled antibodies.

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Ideal Dimers of Gold Nanospheres for Precision Plasmonics: Synthesis and Characterization at the Single‐Particle Level for Identification of Higher Order Modes

Cited by 61 publications

References 39 publications

Gold Nanoparticle Plasmonic Superlattices as Surface-Enhanced Raman Spectroscopy Substrates

Gold Nanoparticle Plasmonic Superlattices as Surface-Enhanced Raman Spectroscopy Substrates

DNA‐Mediated Self‐Assembly of Plasmonic Antennas with a Single Quantum Dot in the Hot Spot

Localization of PD‐L1 on single cancer cells by iSERS microscopy with Au/Au core/satellite nanoparticles

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