Amine-Assisted Synthesis of Concave Polyhedral Platinum Nanocrystals Having {411} High-Index Facets

Huang, Xiaoqing; Zhao, Zipeng; Fan, Jingmin; Tan, Yueming; Zheng, Nanfeng

doi:10.1021/ja1117528

Cited by 488 publications

(407 citation statements)

References 28 publications

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“…Along with the tilting, the nanoparticles changes from four-armed star-like to elongated six-armed stars (Fig. 1d), which fits to the feature of octapod nanoparticles owning eight trigonal pyramidal arms 27 . On the basis of these observations, we proposed a concave polyhedral model of this unique iron oxide nanostructure (Fig.…”

Section: Synthesis and Characterizationsupporting

confidence: 66%

“…In the past two decades, controlled synthesis (for example, ion-assisted methods) of unusual and sophisticated metallic nanostructures (for example, octahedral, tetrahexahedral and concave) [25][26][27][28][29] is prevailing compared with that of metal oxide nanostructures [30][31][32] . However, the investigation of iron oxide nanoparticles with different morphologies is rare, probably because it is difficult to prepare iron oxide nanoparticles with diverse shapes.…”

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confidence: 99%

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Octapod iron oxide nanoparticles as high-performance T2 contrast agents for magnetic resonance imaging

et al. 2013

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Spherical superparamagnetic iron oxide nanoparticles have been developed as T 2 -negative contrast agents for magnetic resonance imaging in clinical use because of their biocompatibility and ease of synthesis; however, they exhibit relatively low transverse relaxivity. Here we report a new strategy to achieve high transverse relaxivity by controlling the morphology of iron oxide nanoparticles. We successfully fabricate size-controllable octapod iron oxide nanoparticles by introducing chloride anions. The octapod iron oxide nanoparticles (edge length of 30 nm) exhibit an ultrahigh transverse relaxivity value (679.3±30 mM À 1 s À 1 ), indicating that these octapod iron oxide nanoparticles are much more effective T 2 contrast agents for in vivo imaging and small tumour detection in comparison with conventional iron oxide nanoparticles, which holds great promise for highly sensitive, early stage and accurate detection of cancer in the clinic.

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Section: Synthesis and Characterizationsupporting

confidence: 66%

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confidence: 99%

Octapod iron oxide nanoparticles as high-performance T2 contrast agents for magnetic resonance imaging

et al. 2013

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“…However, they are not atoms on the same environment because their CN of longer distance are different. Actually crystals with high index facets also represent high activity in many cases,118, 122, 123, 124, 125, 126 as well as edges. For accuracy and simplicity, we consider the edges as the turn of facets.…”

Section: Novel Structures and Atypical Edgesmentioning

confidence: 99%

Face the Edges: Catalytic Active Sites of Nanomaterials

Wang

2015

Advanced Science

150

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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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“…Selected‐area electron diffraction (SAED) patterns of an individual sphere (inset of Figure 4a) show several intense spots which are indexed to a fcc crystal structure, suggesting that several grain particles are randomly aggregated in the nanospheres, rather than oriented growth. Some atomic edge and kink sites caused by unsaturated Pt coordination atoms can be observed on the atomic Pt surface, which is highly valuable for high electrocatalytic performance (Figure 4b) 19…”

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confidence: 99%