Formation of Hexagonal-Close Packed (HCP) Rhodium as a Size Effect

Jing, Huang; Li, Zhi; Duan, Hao; Cheng, Zhi; Li, Ya Dong; Zhu, Jing; Yu, Rong

doi:10.1021/jacs.6b09730

Cited by 60 publications

(84 citation statements)

References 33 publications

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“…Normally, the crystal structures of noble metal nanomaterials can be engineered by high temperature, high pressure, and surface modification . As a common method, electron beam irradiation is widely used to study the structural transformation of nanomaterials, including morphology and phase changes . For example, the ultrathin hexagonal close‐packed (hcp) Au square sheets are sensitive to electron beam, resulting in the crystal phase transformation from hcp to face‐centered cubic (fcc) phases .…”

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confidence: 99%

Size‐Dependent Phase Transformation of Noble Metal Nanomaterials

Saleem

Cui

Zhang

et al. 2019

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As an important aspect of crystal phase engineering, controlled crystal phase transformation of noble metal nanomaterials has emerged as an effective strategy to explore novel crystal phases of nanomaterials. In particular, it is of significant importance to observe the transformation pathway and reveal the transformation mechanism in situ. Here, the phase transformation behavior of face‐centered cubic (fcc) Au nanoparticles (fcc‐AuNPs), adhering to the surface of 4H nanodomains in 4H/fcc Au nanorods, referred to as 4H‐AuNDs, during in situ transmission electron microscopy imaging is systematically studied. It is found that the phase transformation is dependent on the ratio of the size of the monocrystalline nanoparticle (NP) to the diameter of 4H‐AuND. Furthermore, molecular dynamics simulation and theoretical modeling are used to explain the experimental results, giving a size‐dependent phase transformation diagram which provides a general guidance to predict the phase transformation pathway between fcc and 4H Au nanomaterials. Impressively, this method is general, which is used to study the phase transformation of other metal NPs, such as Pd, Ag, and PtPdAg, adhering to 4H‐AuNDs. The work opens an avenue for selective phase engineering of nanomaterials which may possess unique physicochemical properties and promising applications.

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confidence: 99%

Size‐Dependent Phase Transformation of Noble Metal Nanomaterials

Saleem

Cui

Zhang

et al. 2019

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“…Localized sample thickness gradients are another consideration for the phase transformation inconsistencies. In a study identifying HCP nanoparticles in rhodium researchers employed first-principle calculations to estimate the surface energies of planes in FCC and HCP lattices 14 . Several low-index FCC and HCP surfaces were studied; for HCP rhodium, there are two low energy surfaces, (0001) and (1010 ), while (111) is the only one for FCC.…”

Section: Resultsmentioning

confidence: 99%

“…In this work, the transformation and stabilization of an FCC-HCP phase change is studied in free-standing NC gold thin-films irradiated with Au 4+ ions at 200 °C. High-resolution transmission electron microscopy (HR-TEM) and precession electron diffraction (PED) was used to show that there is an energetic threshold that is overcome by interfacial and radiation-induced strain which can cause a phase transition in gold nanostructures within a thickness greater than shown in previous studies 14 . Deformation mechanisms are presented, and furthermore,…”

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confidence: 99%

Ion irradiation induced phase transformation in gold nanocrystalline films

Suri

Nathaniel

et al. 2020

Sci Rep

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Gold is a noble metal typically stable as a solid in a face-centered cubic (FCC) structure under ambient conditions; however, under particular circumstances aberrant allotropes have been synthesized. In this work, we document the phase transformation of 25 nm thick nanocrystalline (NC) free-standing gold thin-film via in situ ion irradiation studied using atomic-resolution transmission electron microscopy (TEM). Utilizing precession electron diffraction (PED) techniques, crystallographic orientation and the radiation-induced relative strains were measured and furthermore used to determine that a combination of surface and radiation-induced strains lead to an FCC to hexagonal close packed (HCP) crystallographic phase transformation upon a 10 dpa radiation dose of Au4+ ions. Contrary to previous studies, HCP phase in nanostructures of gold was stabilized and did not transform back to FCC due to a combination of size effects and defects imparted by damage cascades.

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“…Quite recently, some monometallic NPs were found to show an unusual crystal structure that is unobtainable in their bulk states . For example, hcp‐Au nanosheets, fcc‐Ru NPs, fcc‐Os NPs, and hcp‐Rh nanosheets are prepared by using wet chemistry methods at ambient conditions. However, controlling the crystal structure of an alloy system is still challenging, even at the nanoscale.…”

Section: Binary Solid‐solution Nanoparticles (Ssnps) Between Immiscibmentioning

confidence: 99%

New Aspects of Platinum Group Metal‐Based Solid‐Solution Alloy Nanoparticles: Binary to High‐Entropy Alloys

Kusada

Kitagawa

2020

Chemistry A European J

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with any combination and composition is not an easy task owing to the metallurgicala spects. In this minireview,t he focus is on recent advances in PGM-based solid-solution alloy NPs, andi np articular those with immiscible alloy systems. Concepts, synthesis, and properties of the alloy NPs are introduced, and the existing challenges and future perspectives are discussed.[a] Dr. Figure 2. The number of papers including the keywords "PGM-M" or "M-PGM", which means PGM-based binaryalloy systems (where PGMorMis the atomic symbol of aP GM element or acounterpart of the alloy system) such as "Ru-Sc" or "Sc-Ru",and "nano" through the Web of Science,and the periodic table of the elementsi ndicating the type of alloy system classified into six groups, as follows: class 1( yellow)c onsists of only intermetallic phases;class 2( green) covers bothintermetallic and solid-solutionp hases (at least morethan 10 at %o fs olid-solution phases at 1000 8C);class 3( purple) is mostly solid-solution phases (more than 70 at %a t1 000 8C);class 4( blue) is all-proportional solid solutions;class 5( pink) is partly solid-solution phases( less than 70 at %a t 1000 8C);and class 6( red) is completely immiscible, and unknown (gray). a) Ru, b) Os, c) Rh,d)Ir, e) Pd, f) Pt.

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Formation of Hexagonal-Close Packed (HCP) Rhodium as a Size Effect

Cited by 60 publications

References 33 publications

Size‐Dependent Phase Transformation of Noble Metal Nanomaterials

Size‐Dependent Phase Transformation of Noble Metal Nanomaterials

Ion irradiation induced phase transformation in gold nanocrystalline films

New Aspects of Platinum Group Metal‐Based Solid‐Solution Alloy Nanoparticles: Binary to High‐Entropy Alloys

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