Aqueous Gold Overgrowth of Silver Nanoparticles: Merging the Plasmonic Properties of Silver with the Functionality of Gold

Mayer, Martín; Steiner, Anja Maria; Röder, Falk; Formánek, Petr; König, Tobias; Fery, Andreas

doi:10.1002/anie.201708398

Cited by 49 publications

(57 citation statements)

References 38 publications

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“…At the same time, metal overgrowth can increase the chemical stability of NPs. A sub-skin depth Au layer has been shown to enable oxidant stability and functionality without altering the optical properties of Ag nanocubes ( Figure 7G) [99].…”

Section: Functional Shells For Augmented Sers Applicationsmentioning

confidence: 99%

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Kuttner¹

2018

Plasmonics

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This chapter gives a brief overview of plasmonic nanoparticle (NP)-based sensing concepts ranging from classical spectral-shift colorimetry to the highly active field of surface-enhanced Raman scattering (SERS) spectroscopy. In the last two decades, colloidal approaches have developed significantly. This is seen with, for example, refractive-index sensing, detection of ad−/desorption and ligand-exchange processes, as well as ultrasensitive chemical sensing utilizing well-defined nanocrystals or discrete self-assembled superstructures in 2D and 3D. Apart from individual NPs, the rational design of self-assembled nanostructures grants spectroscopic access to unprecedented physicochemical information. This involves selected research examples on molecular trapping, ligand corona analysis, SERS-encoding, and biosensing. The origin of the SERS effect, also in regard to hot spot formation by off-resonant excitation, is reviewed and discussed in the context of the current challenge to formulate a generalized metric for high SERS efficiency. Special emphasis lies in addressing the fundamental design criteria and the specific challenges of these particle-based sensing techniques.

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Section: Functional Shells For Augmented Sers Applicationsmentioning

confidence: 99%

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Kuttner¹

2018

Plasmonics

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“…The FDTD method is especially useful to calculate the response of plasmonic particles, as there is a wide range of geometries accessible through wet‐chemical synthesis. For instance, spherical particles, anisotropic particles such as rods, hollow as well as multilayered core/shell particles can be achieved via scalable synthesis methods. In a periodic array of plasmonic particles, the lattice period, and thus the nearest‐neighbor interparticle distance, crucially determines the plasmonic SLR properties, since pronounced SLRs require an energetic overlap between the single particle LSPR and the Bragg mode.…”

Section: Introductionmentioning

confidence: 99%

Mechanotunable Plasmonic Properties of Colloidal Assemblies

Brasse

Gupta

Schollbach

et al. 2019

Adv Materials Inter

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Noble metal nanoparticles can absorb incident light very efficiently due to their ability to support localized surface plasmon resonances (LSPRs), collective oscillations of the free electron cloud. LSPRs lead to strong, nanoscale confinement of electromagnetic energy which facilitates applications in many fields including sensing, photonics, or catalysis. In these applications, damping of the LSPR caused by inter‐ and intraband transitions is a limiting factor due to the associated energy losses and line broadening. The losses and broad linewidth can be mitigated by arranging the particles into periodic lattices. Recent advances in particle synthesis, (self‐)assembly, and fabrication techniques allow for the realization of collective coupling effects building on various particle sizes, geometries, and compositions. Beyond assemblies on static substrates, by assembling or printing on mechanically deformable surfaces a modulation of the lattice periodicity is possible. This enables significant alteration and tuning of the optical properties. This progress report focuses on this novel approach for tunable spectroscopic properties with a particular focus on low‐cost and large‐area fabrication techniques for functional plasmonic lattices. The report concludes with a discussion of the perspectives for expanding the mechanotunable colloidal concept to responsive structures and flexible devices.

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“…[41] This galvanic replacement can be inhibited by maintaining a basic pH or by adding iodide and chloride to obtain Ag@Au CS NCs and NPs (Figure 2a,b). [26,42,43] Double shells (with a first Ag shell and second Au shell, or first Au shell and a second Ag shell) have also been deposited on Au NP dimers to reversibly regulate LSPR. [44] Along with the longer adsorption wavelength of the Au shell, the combination of Ag and Au shells with a controlled thickness provides a way to adjust the LSPR of NPs at desired positions.…”

Section: Plasmonic Core-shell Metal Np Heterostructuresmentioning

confidence: 99%

DNA‐Based Plasmonic Heterogeneous Nanostructures: Building, Optical Responses, and Bioapplications

Zhao

2020

Advanced Materials

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The integration of multiple functional nanoparticles into a specific architecture allows the precise manipulation of light for coherent electron oscillations. Plasmonic metals-based heterogeneous nanostructures are fabricated by using DNA as templates. This comprehensive review provides an overview of the controllable synthesis and self-assembly of heterogeneous nanostructures, and analyzes the effects of structural parameters on the regulation of optical responses. The potential applications and challenges of heterogeneous nanostructures in the fields of biosensors and bioanalysis, in vivo monitoring, and phototheranostics are discussed. 1907880 (2 of 22) www.advmat.de www.advancedsciencenews.com 2.1. Plasmonic Metal NP Heterostructures Heterostructures consisting of distinct metal NPs can give rise to targeted LSPR properties, and the plasmonic coupling of nano-objects between plasmonic metal NPs enhances EM fields. The intense EM enhancement gives rise to intense optical responses, which is dependent on sizes, shapes, and even the orientation of constituent NPs. [2] Plasmonic metallic NPs, especially Au and Ag NPs, possess tunable LSPR over a broad spectral range from the visible to the NIR regions and Yuan Zhao is an associate professor at Jiangnan University. She received her Ph.D. degree at Jiangnan University in 2013, supervised by Prof. Chuanlai Xu. She was a postdoctoral fellow at the Chinese University of Hong Kong in 2019, directed by Prof. Jianfang Wang. Her current research focuses on functional nanomaterials with optical and electrochemical properties for applications.

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Aqueous Gold Overgrowth of Silver Nanoparticles: Merging the Plasmonic Properties of Silver with the Functionality of Gold

Cited by 49 publications

References 38 publications

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Plasmonics in Sensing: From Colorimetry to SERS Analytics

Mechanotunable Plasmonic Properties of Colloidal Assemblies

DNA‐Based Plasmonic Heterogeneous Nanostructures: Building, Optical Responses, and Bioapplications

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