Synthesis and Optical Properties of Cubic Gold Nanoframes.
Leslie Au,Yeechi Chen,Fei Zhou,Pedro H. C. Camargo,Byungkwon Lim,Zhi-Yuan Li,David S. Ginger,Younan Xia +7 more
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TLDR
A mechanistic study of the reaction revealed that the formation of Au nanoframes relies on the diffusion of both Au and Ag atoms, and the effect of the edge length and ridge thickness of the nan oframes on the localized surface plasmon resonance peak was explored.Abstract:
This paper describes a facile method of preparing cubic Au nanoframes with open structures via the galvanic replacement reaction between Ag nanocubes and AuCl2−. A mechanistic study of the reaction revealed that the formation of Au nanoframes relies on the diffusion of both Au and Ag atoms. The effect of the edge length and ridge thickness of the nanoframes on the localized surface plasmon resonance peak was explored by a combination of discrete dipole approximation calculations and single nanoparticle spectroscopy. With their hollow and open structures, the Au nanoframes represent a novel class of substrates for applications including surface plasmonics and surface-enhanced Raman scattering.read more
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Controlling the synthesis and assembly of silver nanostructures for plasmonic applications
Matthew Rycenga,Claire M. Cobley,Jie Zeng,Weiyang Li,Christine H. Moran,Qiang Zhang,Dong Qin,Younan Xia +7 more
TL;DR: In plasmonics, the metal nanostructures can serve as antennas to convert light into localized electric fields (E-fields) or as waveguides to route light to desired locations with nanometer precision through a strong interaction between incident light and free electrons in the nanostructure.
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Gold Nanomaterials at Work in Biomedicine
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25th Anniversary Article: Galvanic Replacement: A Simple and Versatile Route to Hollow Nanostructures with Tunable and Well-Controlled Properties
TL;DR: A progress report on the use of galvanic replacement for generating complex hollow nanostructures with tunable and well-controlled properties and its capability to fabricate nanomaterials with complex structures and/or compositions by coupling with other processes such as co-reduction and the Kirkendall effect.
Journal ArticleDOI
Noble metal alloy complex nanostructures: controllable synthesis and their electrochemical property
TL;DR: This review highlights the recent advances in the controllable synthesis of noble metal alloy complex nanostructures including nanoframes/nanocages, branched structures, concave/convex structures, core-shell structures and ultrathin structures, and the effects of the well-defined nanocrystals on the modified and improved electrochemical properties.
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Anisotropic nanomaterials: structure, growth, assembly, and functions
TL;DR: This review presents an overview of current research in the area of anisotropic nanomaterials in general and noble metal nanoparticles in particular, with an introduction to the advancements in this area followed by general aspects of the growth ofanisotropic nanoparticles.
References
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Shape-Controlled Synthesis of Gold and Silver Nanoparticles
Yugang Sun,Younan Xia +1 more
TL;DR: Monodisperse samples of silver nanocubes were synthesized in large quantities by reducing silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone) (PVP), characterized by a slightly truncated shape bounded by {100, {110}, and {111} facets.
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Transmission Electron Microscopy of Shape-Controlled Nanocrystals and Their Assemblies
TL;DR: In this paper, the authors introduce the fundamentals of TEM and its applications in structural determination of shape-controlled nanocrystals and their assemblies, and demonstrate in situ TEM for characterizing and measuring the thermodynamic, electric, and mechanical properties of individual nanostructures, from which the structure−property relationship can be registered with a specific nanoparticle/structure.
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Shape-controlled synthesis of metal nanostructures: the case of silver.
TL;DR: Investigating the growth mechanisms for silver nanocubes, nanowires, and nanospheres produced through a polymer-mediated polyol process found that the crystallinity of a seed and the extent of the PVP coverage on the seed were both instrumental in controlling the morphology of final product.
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Localized surface plasmon resonance spectroscopy of single silver nanocubes
Leif J. Sherry,Shih-Hui Chang,George C. Schatz,Richard P. Van Duyne,Benjamin J. Wiley,Younan Xia +5 more
TL;DR: In this work, dark-field microscopy is used to observe a new plasmon resonance effect for a single silver nanocube in which the plAsmon line shape has two distinct peaks when the particles are located on a glass substrate.
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Fabrication of hollow palladium spheres and their successful application to the recyclable heterogeneous catalyst for Suzuki coupling reactions
TL;DR: Novel palladium hollow spheres were synthesized using silica spheres as a template, and they were successfully applied as recyclable heterogeneous catalysts for Suzuki cross coupling reactions.
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