Nanoframes: Rational Design of Metal Nanoframes for Catalysis and Plasmonics (Small 22/2015)

Fang, Zhujun; Wang, Youcheng; Liu, Chenxuan; Chen, Sheng; Sang, Wei; Wang, Chao; Zeng, Jie

doi:10.1002/smll.201570127

Cited by 3 publications

(4 citation statements)

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“…As the galvanic replacement reaction transforms the structures into nanocages and nanoframes, the near-infrared mode red shifts and the plasmon peak centered near 600 nm increasingly takes on the character of the starting Au template. Such behavior is consistent with both the expected response from a nanoframe and an inner core plasmon resonance that becomes increasingly decoupled from the confining structure. For all cases, the expected influence of the substrate is to red shift the plasmon modes …”

Section: Resultssupporting

confidence: 82%

“…Template-mediated solution-based chemistry has proven to be one of the most effective means for exerting architectural control over syntheses directed toward the formation of complex noble metal nanostructures. − Such syntheses aim to replace erratic and disorganized self-nucleation processes with orderly processes dictated by well-defined templates capable of exerting control over reaction pathways such that a single end-product is produced in high yield. Templates can act as platforms upon which material is deposited or sculpted through its partial dissolution into the adjacent liquid medium.…”

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confidence: 99%

“…Because galvanic replacement reactions can be terminated at any point along the reaction pathway, it is possible to derive an entire family of nanostructure architectures from a single synthetic protocol. As a result, noble metal nanoshells, nanocages, and nanoframes ,, are all attractive in that they have distinctive properties that can be tuned over a wide parameter space. By combining the two aforementioned procedures, nanostructures of even greater structural complexity are obtained when galvanic replacement reactions are carried out on core–shell structures.…”

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confidence: 99%

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A Wulff in a Cage: The Confinement of Substrate-Based Structures in Plasmonic Nanoshells, Nanocages, and Nanoframes Using Galvanic Replacement

et al. 2016

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Galvanic replacement reactions carried out on solid core-shell structures typically yield a noble metal nanorattle geometry in which a mobile core is contained within a hollowed shell. Here, we adapt this colloidal synthesis to substrate-based structures to obtain a fundamentally altered product in which an immobilized core is separated from the shell by a well-defined gap, an architecture unobtainable using colloidal techniques and that offers unique advantages in terms of generating plasmonic near-field effects within the confines of a single structure. In the devised route, Wulff-shaped templates of Au, Pt, or Pd, formed through the dewetting of ultrathin films, are first transformed into core-shell structures through the reduction of Ag(+) ions onto their surface and then further transformed through the galvanic replacement of Ag with Au. Through suitable adjustments to the shell geometry, the epitaxial relationship with the substrate, and the extent to which the shell is replaced, it is possible to generate an entire family of nanostructures in which a Wulff-shaped core is confined within a nanoshell, nanocage, or nanoframe, where, in all cases, bonds formed between the structure and the substrate preclude motion. With the potential to tune the gap width, the geometry of the confining structure, and the composition of the core, shell, and substrate, these structures could find application as catalytic nanoreactors able to drive both single-step and cascade reactions or as plasmon-based sensing elements for biological and chemical detection.

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Section: Resultssupporting

confidence: 82%

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confidence: 99%

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confidence: 99%

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A Wulff in a Cage: The Confinement of Substrate-Based Structures in Plasmonic Nanoshells, Nanocages, and Nanoframes Using Galvanic Replacement

et al. 2016

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“…Nanoframesc an be readily prepared using at wo-step procedure that involves site-selected deposition of an oble metal on at emplate,f ollowed by selective removal of the template throughe tching. [26][27][28][29][30][31] To this end, our group demonstrated the synthesis of Rh cubic nanoframes with well-controlled ridge thickness through selective removal of Pd cores from Pd@Rh core-frame nanocubes. [27] In this synthesis, Pd nanocubes served as at emplate andR hw as depositeds pecifically on the corners ande dges.…”

Section: Introductionmentioning

confidence: 99%

Platinum Cubic Nanoframes with Enhanced Catalytic Activity and Durability Toward Oxygen Reduction

et al. 2016

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We report the synthesis and electrocatalytic properties of Pt cubic nanoframes with ultrathin ridges less than 2 nm in thickness. The nanoframes were synthesized through site-selected deposition of Pt onto the corner and edge sites of Pd nanocubes, followed by selective removal of the Pd cores via chemical etching. The Br ions chemisorbed on the side faces of a Pd nanocube played a critical role in enabling the siteselected deposition. In addition, the kinetics of deposition and the diffusion of Pt adatoms was optimized by carefully controlling the injection rate of the Pt precursor and the reaction temperature, respectively, to obtain the frame-like structure. When benchmarked against a commercial Pt/C comprised of Pt particles 2-3 nm in size, the Pt frame/C catalyst exhibited not only enhanced mass activity toward oxygen reduction, but also substantially improved catalytic durability. In an accelerated durability test, the Pt frame/C catalyst showed a mass activity more than 6× greater than for the Pt/C reference after 20 000 cycles of repeated potential sweeping. This improvement can be largely attributed to the frame-like structure, which is unique in suppressing both the detachment and aggregation of catalytic particles owing to the significantly enhanced interaction with carbon support.

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Optical properties of size selected neutral Ag clusters: electronic shell structures and the surface plasmon resonance

et al. 2018

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Nanoframes: Rational Design of Metal Nanoframes for Catalysis and Plasmonics (Small 22/2015)

Cited by 3 publications

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A Wulff in a Cage: The Confinement of Substrate-Based Structures in Plasmonic Nanoshells, Nanocages, and Nanoframes Using Galvanic Replacement

A Wulff in a Cage: The Confinement of Substrate-Based Structures in Plasmonic Nanoshells, Nanocages, and Nanoframes Using Galvanic Replacement

Platinum Cubic Nanoframes with Enhanced Catalytic Activity and Durability Toward Oxygen Reduction

Optical properties of size selected neutral Ag clusters: electronic shell structures and the surface plasmon resonance

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