Facile Synthesis of Pd−Cu Bimetallic Twin Nanocubes and a Mechanistic Understanding of the Shape Evolution

Shi, Yifeng; Lyu, Zhiheng; Liu, Jingyue; Chase, Emily; Xia, Younan

doi:10.1002/cnma.201900653

Cited by 4 publications

(7 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This arises naturally from the fact that two twin boundaries in parallel can effectively cancel the impact of each on the symmetry of the external shape. This observation agrees with models of lamellar twinned particles proposed in the lateral growth of silver and copper nanoplates. ,− …”

Section: Resultssupporting

confidence: 90%

“…With careful inspection, this is found to be visible in the TEM images of gold nanocubes, 23,40 copper nanocubes, 55,60 silver nanocubes, 61−63 and core−shell nanocubes. 47,64,65 It is curious that this contrast, and hence {111} twin boundaries generating it, has not been reported previously, despite it being evident in many TEM images in the literature. In some cases, this is due to the orientation of nanocubes in which they are imaged, such as some nanocubes in Figure 1.…”

Section: ■ Discussionmentioning

confidence: 88%

“…While reviewing TEM images in the literature, we observed that some nanocubes, which were assumed to be single crystals, in fact also exhibit similar stripe contrast suggesting that they also contain lamellar twin planes. With careful inspection, this is found to be visible in the TEM images of gold nanocubes, , copper nanocubes, , silver nanocubes, − and core–shell nanocubes. ,, …”

Section: Discussionmentioning

confidence: 97%

See 2 more Smart Citations

Shape Control Beyond the Seeds in Gold Nanoparticles

Tong

Yadav

et al. 2021

Chem. Mater.

View full text Add to dashboard Cite

In typical seed-mediated syntheses of metal nanocrystals, the shape of the nanocrystal is determined largely by the seed nucleation environment and subsequent growth environment (where “environment” refers to the chemical environment, including the surfactant and additives). In this approach, crystallinity is typically determined by the seeds, and surfaces are controlled by the environment(s). However, surface energies, and crystallinity, are both influenced by the choice of environment(s). This limits the permutations of crystallinity and surface facets that can be mixed and matched to generate new nanocrystal morphologies. Here, we control post-seed growth to deliberately incorporate twin planes during the growth stage to deliver new final morphologies, including twinned cubes and bipyramids from single-crystal seeds. The nature and number of twin planes, together with surfactant control of facet growth, define the final nanoparticle morphology. Moreover, by breaking symmetry, the twin planes introduce new facet orientations. This additional mechanism opens new routes for the synthesis of different morphologies and facet orientations.

show abstract

Section: Resultssupporting

confidence: 90%

Section: ■ Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Shape Control Beyond the Seeds in Gold Nanoparticles

Tong

Yadav

et al. 2021

Chem. Mater.

View full text Add to dashboard Cite

show abstract

Section: Examples Of Shape-controlled Nanocrystalsmentioning

confidence: 99%

Noble-Metal Nanocrystals with Controlled Shapes for Catalytic and Electrocatalytic Applications

et al. 2020

Self Cite

View full text Add to dashboard Cite

The successful synthesis of noble-metal nanocrystals with controlled shapes offers many opportunities to not only maneuver their physicochemical properties but also optimize their figures of merit in a wide variety of applications. In particular, heterogeneous catalysis and surface science have benefited enormously from the availability of this new class of nanomaterials as the atomic structure presented on the surface of a nanocrystal is ultimately determined by its geometric shape. The immediate advantages may include significant enhancement in catalytic activity and/or selectivity and substantial reduction in materials cost while providing a well-defined model system for mechanistic study. With a focus on the monometallic system, this review article provides a comprehensive account of recent progress in the development of noble-metal nanocrystals with controlled shapes, in addition to their remarkable performance in a large number of catalytic and electrocatalytic reactions. We hope that this review article offers the impetus and roadmap for the development of next-generation catalysts vital to a broad range of industrial applications.

show abstract

“…In addition to single-crystal particles, twinned cubes and bipyramids have also been prepared using Pd nanoplates as the seeds . Again, lattice mismatch also played a pivotal role with Cu nucleating from one side of the nanoplate at the initial stage and then covering both sides as more Cu was formed.…”

Section: Seed-mediated Growthmentioning

confidence: 99%

Shape-Controlled Synthesis of Copper Nanocrystals for Plasmonic, Biomedical, and Electrocatalytic Applications

2022

Self Cite

View full text Add to dashboard Cite

Metrics & MoreArticle RecommendationsCONSPECTUS: As a metal that can occur in nature in the elemental form, copper (Cu) has been used by humans since ca. 8000 BC. With most properties matching those of Ag and Au, Cu has played a more significant role in commercial applications owing to its much higher (the 25th among all elements) abundance in Earth's crust and thus more affordable price. In addition to its common use as a conductor of heat and electricity, it is a constituent of various metal alloys for hardware, coins, strain gauges, and thermocouples. Bulk Cu is also widely utilized as a building material. When downsized to the nanoscale, Cu and Cu-based structures have found widespread use in applications ranging from electronics to optoelectronics, plasmonics, catalysis, sensing, and biomedicine. Besides Ag and Au, for example, Cu is another metal known for its localized surface plasmon resonance (LSPR) in the visible and nearinfrared regions when prepared as nanocrystals. As a potential replacement for indium−tin oxide (ITO) films, polymer coatings containing Cu nanowires are strong candidates for the fabrication of transparent and flexible electrodes key to touchscreen display and related applications. The commercial catalysts for water−gas shift and gas detoxification reactions are also based on Cu nanoparticles. Most recently, Cu nanocrystals have attracted considerable interest for their superior selectivity toward hydrocarbons and multicarbon species during the electrochemical reduction of CO 2 . The success of all these applications critically depends on our ability to control the shape and surface structure of the nanocrystals. Relative to Ag and Au, it is more challenging to generate Cu-based nanocrystals using colloidal methods due to its lower reduction potential and greater vulnerability to oxidation.In this Account, we discuss recent progress in the colloidal synthesis of Cu nanocrystals with controlled shapes for plasmonic, biomedical, and catalytic applications. With glucose serving as a reducing agent, Cu nanocrystals bearing a twinned or single-crystal structure can be synthesized using an aqueous system with the assistance of hexadecylamine (HDA). In this synthetic protocol, HDA not only passivates the surface to protect the nanocrystals from oxidation but also manipulates the reduction kinetics of Cu(II) precursor through coordination and an increase of solution pH. Typical products include nanocubes and penta-twinned nanowires whose surfaces are dominated by {100} facets. When seeds produced either in situ or ex situ are introduced, Cu-based nanocrystals featuring a singly twinned, core−shell, or Janus structure can be readily synthesized. Aside from segmented structures, Cu-based alloys with various noble metals can be synthesized through coreduction or a galvanic replacement reaction with preformed Cu nanocrystals. By controlling the size and/or shape of Cu nanocrystals, their LSPR peaks can be tuned into the near-infrared region, making them promising candidates for optical imaging con...

show abstract

Facile Synthesis of Pd−Cu Bimetallic Twin Nanocubes and a Mechanistic Understanding of the Shape Evolution

Cited by 4 publications

References 38 publications

Shape Control Beyond the Seeds in Gold Nanoparticles

Shape Control Beyond the Seeds in Gold Nanoparticles

Noble-Metal Nanocrystals with Controlled Shapes for Catalytic and Electrocatalytic Applications

Shape-Controlled Synthesis of Copper Nanocrystals for Plasmonic, Biomedical, and Electrocatalytic Applications

Contact Info

Product

Resources

About