Some evidence for the octa-twin model of tetrapod ZnO particles

Iwanaga, Hiroshi; Fujii, M.; Ichihara, Masaki; Takeuchi, Shin

doi:10.1016/0022-0248(94)90116-3

Cited by 36 publications

(20 citation statements)

References 10 publications

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“…Second, ZnO single crystal patches are found at the center of T-ZnO nanocrystals for the first time. No ZnO patches were found in the early studies about the T-ZnO crystal 15,[21][22][23][24][25][26][27] and the recent studies about cylindrical T-ZnO microcrystals. 7 It is worthy noting that the roots of arms in present tetrapods are tapering, the diameter of the arms is larger than that of the core, and the side plane of the core is triangular, as shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Synthesis and Structural Characteristics of High-Quality Tetrapod-Like ZnO Nanocrystals by a Modified Vapor Transport Process

Gao

2004

Crystal Growth & Design

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High-quality tetrapod-like ZnO (T-ZnO) nanocrystals were synthesized by a modified vapor transport process. NiO nanocrystals were prepared on a Si substrate as a catalyst. High-yield zinc vapor was produced by a carbothermal reduction of zinc carbonate to promote the synthesis of T-ZnO nanocrystals. The as-grown T-ZnO nanocrystals are assembled by four hexagonal prismatic nanorods, whose diameters and lengths are 80-100 and 600-1000 nm, respectively. In the center of a T-ZnO nanocrystal, a tetrahedral core and several irregular patches were found among the nanorods. As a whole, T-ZnO nanocrystals are preferentially arranged along the 〈001〉 direction of ZnO. The photoluminescence spectrum of T-ZnO nanocrystals showed two emission bands, a strong ultraviolet emission at around 390 nm and a weak blue emission at 440 nm. The green light emission that is related to the existence of the defects in ZnO crystals cannot be distinguished. It implies that the high crystal integrity of T-ZnO nanocrystals has been obtained. The process reported here is demonstrated as an effective candidate for synthesizing ZnO three-dimensional nanocrystals.

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Section: Resultsmentioning

confidence: 99%

Catalytic Synthesis and Structural Characteristics of High-Quality Tetrapod-Like ZnO Nanocrystals by a Modified Vapor Transport Process

Gao

2004

Crystal Growth & Design

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“…This intrinsic character makes TP a favorite choice for these materials, including ZnO, , CdS, − CdSe, , and CdTe. , These nanocrystals can exist in either hexagonal wurtzite (WZ), or in combination of cubic zinc blende (ZB) and WZ. As known as so far, two models have been developed for the interpretation of the tetrapodal structure, the octa-twin model for WZ TPs − and the model of the ZB core epitaxial growth of WZ arms. , For both cases, the intrinsic crystal growth behaviors of ZB and WZ phases, such as the twinning within the same phase, the variation of stacking sequences of close-packed planes (between ZB and WZ), and the asymmetric growth on polar surfaces, result in various of stacking faults and twin boundaries, thereby significantly promote the complexity of such a three-dimensional organization. These defects can form interfaces of either core/arm or within each part.…”

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confidence: 99%

Atom-Resolved Evidence of Anisotropic Growth in ZnS Nanotetrapods

Liu

Wang

et al. 2011

Nano Lett.

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ZnS nanotetrapods were investigated by atom-resolved microscopy characterization and quantitative simulation. The octahedron core enclosed with Zn- and S-terminated surfaces was verified. Four hexaprism-shaped arms were selectively grown from Zn-terminated surfaces of the core by alternately stacking zinc blende and wurtzite structures. The stacking order change at the core/arm interface is significant to activate the arm growth. The anisotropic growth mechanism was proposed and further proved by the synthesis of ZnS nanoparticles and nanobelts.

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“…Growth of large tetrapod crystals was demonstrated previously. 15,16 The tetrapod legs of these large tetrapods are single crystal hexagonal ZnO with a ͓0001͔ growth direction. 16 Observation of ZnO tetrapod nanorods is similar to the result reported by Dai et al 6 ͑in air͒ and Tang et al 12 ͑in argon flow͒.…”

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confidence: 99%

Luminescent and structural properties of ZnO nanorods prepared under different conditions

Roy

Djurišić

Chan

et al. 2003

Applied Physics Letters

323

177

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The morphology and optical properties of ZnO nanostructures prepared by thermal evaporation of Zn under different conditions was investigated. ZnO nanostructures prepared in air, dry and humid argon flow, and dry and humid nitrogen flow were characterized by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and photoluminescence. Tetrapod nanorods were obtained for fabrication in air, while for fabrication in argon or nitrogen flow nanowires and tetrapod nanorods were obtained. Growth of nanowires from the end of the tetrapod nanorod was observed. Influence of the preparation conditions on the structure and the room-temperature photoluminescence is discussed.

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Some evidence for the octa-twin model of tetrapod ZnO particles

Cited by 36 publications

References 10 publications

Catalytic Synthesis and Structural Characteristics of High-Quality Tetrapod-Like ZnO Nanocrystals by a Modified Vapor Transport Process

Catalytic Synthesis and Structural Characteristics of High-Quality Tetrapod-Like ZnO Nanocrystals by a Modified Vapor Transport Process

Atom-Resolved Evidence of Anisotropic Growth in ZnS Nanotetrapods

Luminescent and structural properties of ZnO nanorods prepared under different conditions

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