Anisotropic Growth of Cubic PbTe Nanoparticles to Nanosheets: Controlled Synthesis and Growth Mechanisms

2010 ◽  
Vol 10 (8) ◽  
pp. 3727-3731 ◽  
Author(s):  
T. J. Zhu ◽  
X. Chen ◽  
X. Y. Meng ◽  
X. B. Zhao ◽  
J. He
Keyword(s):  
Controlled Synthesis ◽  
Anisotropic Growth ◽  
Growth Mechanisms

Phase-controlled synthesis of nickel sulfide series via solvothermal method

2014 ◽  
Vol 07 (01) ◽  
pp. 1450003 ◽  
Author(s):  
Binxia Yuan ◽  
Weiling Luan
Keyword(s):  
Optical Properties ◽  
Nickel Sulfide ◽  
Reduction Method ◽  
Solvothermal Method ◽  
Low Cost ◽  
Nickel Chloride ◽  
Raw Material ◽  
Controlled Synthesis ◽  
Growth Mechanisms ◽  
Detailed Composition

Nickel sulfide series nanoparticles were synthesized by a simple solvothermal reduction method of nickel chloride and element sulfur in the oleylamine solvent. This method could offer potential advantages of mildness, safety, low cost, and simplified fabrication procedures. Through the adjustment of Ni / S raw material ratio, different phases of nickel sulfide, including cubic NiS 2, hexagonal NiS , orthorhombic Ni 7 S 6, and trigonal Ni 3 S 2 were obtained. In addition, the sulfur sources played important roles in the synthesis of nickel sulfide series compounds. The possible growth mechanisms had been discussed based on the influence of reaction temperatures and solvents on the phase structure and detailed composition of the final products. Finally, the obtained optical properties demonstrated that each sample had the unique absorption peak except cubic NiS 2.

Element-specific anisotropic growth of shaped platinum alloy nanocrystals

Science ◽  
2014 ◽  
Vol 346 (6216) ◽  
pp. 1502-1506 ◽  
Author(s):  
Lin Gan ◽  
Chunhua Cui ◽  
Marc Heggen ◽  
Fabio Dionigi ◽  
Stefan Rudi ◽  
...  
Keyword(s):  
Scanning Transmission Electron Microscopy ◽  
Chemical Degradation ◽  
Anisotropic Growth ◽  
Growth Mechanisms ◽  
Platinum Alloy ◽  
Alloy Nanocrystals ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Compositional Patterns ◽  
Alloy Catalysts

Morphological shape in chemistry and biology owes its existence to anisotropic growth and is closely coupled to distinct functionality. Although much is known about the principal growth mechanisms of monometallic shaped nanocrystals, the anisotropic growth of shaped alloy nanocrystals is still poorly understood. Using aberration-corrected scanning transmission electron microscopy, we reveal an element-specific anisotropic growth mechanism of platinum (Pt) bimetallic nano-octahedra where compositional anisotropy couples to geometric anisotropy. A Pt-rich phase evolves into precursor nanohexapods, followed by a slower step-induced deposition of an M-rich (M = Ni, Co, etc.) phase at the concave hexapod surface forming the octahedral facets. Our finding explains earlier reports on unusual compositional segregations and chemical degradation pathways of bimetallic polyhedral catalysts and may aid rational synthesis of shaped alloy catalysts with desired compositional patterns and properties.

Facile controlled synthesis and growth mechanisms of flower-like and tubular MnO2 nanostructures by microwave-assisted hydrothermal method

2012 ◽  
Vol 369 (1) ◽  
pp. 123-128 ◽  
Author(s):  
Yongliang Li ◽  
Jiajun Wang ◽  
Yong Zhang ◽  
Mohammad Norouzi Banis ◽  
Jian Liu ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Controlled Synthesis ◽  
Growth Mechanisms ◽  
Microwave Assisted

Size and Shape Controlled Synthesis of Pd Nanocrystals

2018 ◽  
Vol 3 (10) ◽  
Author(s):  
Jiawei Zhang ◽  
Huiqi Li ◽  
Zhiyuan Jiang ◽  
Zhaoxiong Xie
Keyword(s):  
Noble Metal ◽  
Rational Design ◽  
Pd Nanoparticles ◽  
Research Progress ◽  
Synthetic Approach ◽  
Controlled Synthesis ◽  
Growth Mechanisms ◽  
Single Crystalline ◽  
Size And Shape ◽  
Wet Chemical Synthesis

Abstract Palladium (Pd) has attracted substantial academic interest due to its remarkable properties and extensive applications in many industrial processes and commercial devices. The development of Pd nanocrystals (NCs) would contribute to reduce overall precious metal loadings, and allow the efficient utilization of energy at lower economic costs. Furthermore, some of the important properties of Pd NCs can be substantially enhanced by rational designing and tight controlling of both size and shape. In this review, we have summarized the state-of-the-art research progress in the shape and size-controlled synthesis of noble-metal Pd NCs, which is based on the wet-chemical synthesis. Pd NCs have been categorized into five types: (1) single-crystalline Pd nano-polyhedra with well-defined low-index facets (e.g. {100}, {111} and {110}); (2) single-crystalline Pd nano polyhedra with well-defined high-index facets, such as Pd tetrahexahedra with {hk0} facets; (3) Pd NCs with cyclic penta-twinned structure, including icosahedra and decahedra; (4) monodisperse spherical Pd nanoparticles; (5) typical anisotropic Pd NCs, such as nanoframes, nanoplate, nanorods/wires. The synthetic approach and growth mechanisms of these types of Pd NCs are highlighted. The key factors that control the structures, including shapes (surface structures), twin structures, single-crystal nanostructures, and sizes are carefully elucidated. We also introduce the detailed characterization tools for analysis of Pd NCs with a specific type. The challenges faced and perspectives on this promising field are also briefly discussed. We believe that the detailed studies on the growth mechanisms of NCs provide a powerful guideline to the rational design and synthesis of noble-metal NCs with enhanced properties. Graphical Abstract:

Size, phase-controlled synthesis, the nucleation and growth mechanisms of NaYF4:Yb/Er nanocrystals

2018 ◽  
Vol 36 (10) ◽  
pp. 1060-1066 ◽  
Author(s):  
Songtao Liu ◽  
Gejihu De ◽  
Yueshan Xu ◽  
Xian Wang ◽  
Yuanyuan Liu ◽  
...  
Keyword(s):  
Nucleation And Growth ◽  
Controlled Synthesis ◽  
Growth Mechanisms ◽  
Nucleation And Growth Mechanisms

scholarly journals Size and Morphology Controlled Synthesis of Boehmite Nanoplates and Crystal Growth Mechanisms

2018 ◽  
Vol 18 (6) ◽  
pp. 3596-3606 ◽  
Author(s):  
Xin Zhang ◽  
Wenwen Cui ◽  
Katharine L. Page ◽  
Carolyn I. Pearce ◽  
Mark E. Bowden ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Controlled Synthesis ◽  
Growth Mechanisms ◽  
Size And Morphology
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