Surfactant‐Free Sub‐2 nm Ultrathin Triangular Gold Nanoframes

Shahjamali, Mohammad Mehdi; Bosman, Michel; Cao, Shaowen; Huang, Xiao; Cao, Xiehong; Zhang, Hua; Pramana, Stevin S.; Xue, Can

doi:10.1002/smll.201300200

Cited by 68 publications

(95 citation statements)

References 52 publications

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“…Au triangular NF with tailorable thickness range from 1.8 nm to 6 nm shows about 2.4 times reduction rate of 4‐nitrophenol, comparing to frames with thickness larger than 10 nm 133. In catalytic reaction, the Au NFs show a reaction rate about 2 times faster than Au nanoboxes, and much faster than solid particles 157.…”

Section: Novel Structures and Atypical Edgesmentioning

confidence: 92%

Face the Edges: Catalytic Active Sites of Nanomaterials

Wang

2015

Advanced Science

151

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Edges are special sites in nanomaterials. The atoms residing on the edges have different environments compared to those in other parts of a nanomaterial and, therefore, they may have different properties. Here, recent progress in nanomaterial fields is summarized from the viewpoint of the edges. Typically, edge sites in MoS2 or metals, other than surface atoms, can perform as active centers for catalytic reactions, so the method to enhance performance lies in the optimization of the edge structures. The edges of multicomponent interfaces present even more possibilities to enhance the activities of nanomaterials. Nanoframes and ultrathin nanowires have similarities to conventional edges of nanoparticles, the application of which as catalysts can help to reduce the use of costly materials. Looking beyond this, the edge structures of graphene are also essential for their properties. In short, the edge structure can influence many properties of materials.

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Section: Novel Structures and Atypical Edgesmentioning

confidence: 92%

Face the Edges: Catalytic Active Sites of Nanomaterials

Wang

2015

Advanced Science

151

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“…6 Au or Ag nanorings also exhibit substantial increases in bulk refractive index sensitivity relative to those of nanodisks with similar diameters, 7 remarkably uniform field intensity enhancements for surface-enhanced Raman scattering, 8 enhanced second harmonic generation at near infrared frequencies 9 and superior catalytic activities. 10 To date, Au or Ag NPs with various shapes, such as nanospheres, nanobars, nanorods, nanorices, nanoneedles, nanowires, nanocubes, nanoprisms, bipyramids, nanocarrots, nanoplates, nanodisks and nanobelts, have been successfully prepared. 11 However, the fabrication of ring-like Au or Ag nanostructures is limited to either electron beam lithography or template techniques.…”

Section: Introductionmentioning

confidence: 99%

Gold nanorings synthesized via a stress-driven collapse and etching mechanism

Fang

Tian

et al. 2016

NPG Asia Mater

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Toroidal Au or Ag nanostructures are of particular interest due to their unique optical responses and superior catalytic applications. However, the fabrication of ring-like Au or Ag nanostructures is limited to either electron beam lithography or template techniques, thus hampering their applications. Here, we present a new stress-driven structure collapse and etching mechanism to synthesize Au nanorings via a direct one-pot solution-based chemical reaction. The nanoparticle-mediated recrystallization process contributes to the formation of Au nanoframes, which contain unusual stress, thus promoting the breakup of the nanoframes and finally converting them into Au nanorings. The Au nanorings with tunable hole sizes exhibit interesting localized surface plasmon features owing to the coupling of bonding and antibonding modes on the inner and outer surfaces of the nanorings. This facile approach may open the door for the preparation of toroidal nanostructures in other compositions for numerous applications.

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“…Ag nanoplates [176][177][178][179] or nanoprisms [180][181][182][183][184][185], which form nanorings and nanoframes, respectively. Although there are various types according to shape, they all have in common excellent NIR photothermal conversion efficiencies, which is advantageous for in vivo cancer treatment, and are easy to load with relatively bulky cargoes both inside and outside due to their surface opened skeletal nanostructures.…”

Section: Nanoframesmentioning

confidence: 99%

Recent Advances in Nanoparticle Shape and Composition Regulation Based on Galvanic Replacement for Cancer Treatment

Shin¹,

Kang²,

Jang³

2018

Preprint

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Owing to their unique physicochemical properties, nanoparticles are used in a variety of ways in the field of cancer treatment, including imaging, drug delivery, and photothermal and photodynamic therapies. The fascinating properties of nanoparticles are determined by their size, morphology, and constituent elements, and various synthetic methods and post-synthetic techniques have been applied to control these factors. Herein, we present examples of shape and composition control through galvanic replacement, a technique that exploits redox potential differences between elements to induce spontaneous ion-exchange and highlight its specific contributions to cancer treatment applications. The present article identifies the recent advances in nanoparticle formation techniques and discusses the future outlook of the field.

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Surfactant‐Free Sub‐2 nm Ultrathin Triangular Gold Nanoframes

Cited by 68 publications

References 52 publications

Face the Edges: Catalytic Active Sites of Nanomaterials

Face the Edges: Catalytic Active Sites of Nanomaterials

Gold nanorings synthesized via a stress-driven collapse and etching mechanism

Recent Advances in Nanoparticle Shape and Composition Regulation Based on Galvanic Replacement for Cancer Treatment

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