Facile synthesis and shape evolution of highly symmetric 26-facet polyhedral microcrystals of Cu2O

Zhou, Weiwei; Yan, Bin; Cheng, Chuanwei; Hu, Hailong; Fan, Hong Jin; Yu, Ting

doi:10.1039/b912034n

Cited by 51 publications

(38 citation statements)

References 43 publications

(38 reference statements)

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“…Cu 2 O microcrystals with a rhombicuboctahedral shape have been reported recently. [16] The Ag 2 O octahedra still show a slight edge truncation. The particle sizes are around 370 nm for the cubes, 480 nm for the truncated cubes, 570 nm for the rhombicuboctahedra, 760 nm for the octahedra and truncated octahedra, and 1400 nm for the hexapods (see the Supporting Information Table S1 for average particle sizes and their standard deviations and Figure S1 for particle size histograms).…”

Section: Resultsmentioning

confidence: 98%

Synthesis of Ag₂O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties

Lyu

Wang

Huang

2010

Chemistry A European J

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We report the development of a facile method for the synthesis of Ag(2)O crystals with systematic shape evolution from cubic to edge- and corner-truncated cubic, rhombicuboctahedral, edge- and corner-truncated octahedral, octahedral, and hexapod structures by mixing AgNO(3), NH(4)NO(3), and NaOH at molar ratios of 1:2:11.8. A sufficient volume of NaOH solution was first added to a mixture of AgNO(3) and NH(4)NO(3) solution to promote the formation of Ag(NH(3))(2)(+) complex ions and the growth of Ag(2)O nanocrystals with good morphological control. The crystals are mostly submicrometer-sized. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy characterization has been performed to determine the crystalline surface facets. A band gap value of approximately 1.45 eV has been found for the octahedral Ag(2)O crystals. By changing the molar ratios of AgNO(3)/NH(4)NO(3)/NaOH to 1:2:41.8, corner-depressed rhombicuboctahedra and elongated hexapods were obtained as a result of enhanced crystal growth along the [100] directions. Smaller nanocubes with average sizes of approximately 200 and 300 nm and octapods can also be prepared by adjusting the reagent molar ratios and their added volumes. Both the octahedra and hexapods with largely silver atom-terminated {111} surface facets responded repulsively and moved to the surface of the solution when dispersing in a solution of positively charged methylene blue, but can be suspended in a negatively charged methyl orange solution. The cubes and octapods, bounded by the {100} faces, were insensitive to the molecular charges in solution. The dramatic facet-dependent surface properties of Ag(2)O crystals have been demonstrated.

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Section: Resultsmentioning

confidence: 98%

Synthesis of Ag₂O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties

Lyu

Wang

Huang

2010

Chemistry A European J

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“…4 Most work was focused on noble metal nanoparticles. Until now, only Cu 2 O microparticles with high-index {522}, {211}, or {322} facets, [9][10][11][12] anatase TiO 2 crystals surrounded by high-energy {011} facets, 20 and octahedral SnO 2 nanocrystals bound by {221} high-index facets 21 have been achieved by different groups using a solution process. Until now, only Cu 2 O microparticles with high-index {522}, {211}, or {322} facets, [9][10][11][12] anatase TiO 2 crystals surrounded by high-energy {011} facets, 20 and octahedral SnO 2 nanocrystals bound by {221} high-index facets 21 have been achieved by different groups using a solution process.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis, shape evolution and magnetic properties of polyhedral 50-facet Fe₃O₄nanocrystals partially enclosed by {311} high-index planes

Hao

Liu

et al. 2014

CrystEngComm

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Magnetite ĲFe 3 O 4 ) polyhedral nanocrystals have been prepared successfully by a simple solvothermal reaction using a mixture of ethylene glycol (EG) and H 2 O as the solvent without the addition of any surfactants or templates. Based on SEM and TEM characterization, the products were determined to be 50-facet Fe 3 O 4 nanocrystals, 200-300 nm in diameter, enclosed by {100}, {110}, {111}, and high-index {311} facets. The morphological evolution of 50-facet Fe 3 O 4 polyhedra was studied carefully and in detail by adjusting the reaction parameters such as the reaction temperature, the reaction time, the amount of urea, and the volume ratio of EG to H 2 O in the solvent. The results indicated that an appropriate EG/H 2 O ratio in the solvent was crucial for the formation of the polyhedral nanocrystals and when the solvent was fixed, the size of the polyhedral nanocrystals could be tuned in a certain range by changing the amount of urea. A possible growth mechanism involving the aggregation and oriented attachment of Fe 3 O 4 seed nanoparticles is proposed on the basis of time-dependent experiments. 22 23737305 † Electronic supplementary information (ESI) available: XPS spectrum, low magnification SEM image, IR spectrum, TG and DSC curves of as-synthesized polyhedral 50-facet Fe 3 O 4 nanocrystals, TEM images and corresponding models projected from different directions. See

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“…During the first discharge, the layered structure was maintained when the electrode was discharged to 0.85 V. In this stage, two peaks at 2θ = 35.54º and 42.10º neither match the (111) and (200) peaks 2θ = 36.4º and 42.3º of cubic Cu2O (JCPDF 005-0667) [29] nor match any peaks of hexagonal Cu2S (JCPDS 026-1116) [30]. Instead, these two peaks come from the layered structure, and their increased intensities should be due to the structural rearrangement accompanying the Li + -insertion.…”

Section: Electrochemical Performances Of Natrochalcite As An Anode Mamentioning

confidence: 99%

Evaluation of Low-cost Natrochalcite Na[Cu2(OH)(H2O)(SO4)2] as an Anode Material for Li- and Na-ion Batteries

Liu

Zhou

Ang

et al. 2016

Electrochimica Acta

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Here we report the evaluation of natrochalcite (Na[Cu2(OH)(H2O)(SO4)2]), an anionic layered structure [Cu2(OH)(H2O)(SO4)2]charge-balanced by Na + , as an anode material for both Li-and Na-ion batteries. It delivers 224 mAh/g and 175 mAh/g in the first discharge in the Li +-and Na +-cells respectively, and decomposes to form amorphous matrixes during this step. In the subsequent charge, the original layered structure is unusually partially recrystallized back from the matrixes, resulting in 53 mAh/g and 35 mAh/g discharge capacities in the second discharge respectively. In subsequent cycling, Li + in the electrolyte is found to replace the original Na + during cycling in the Li +-cell and the electrode in the Li +-cell demonstrates better capacity retention rates than that in the Na +-cell, possibly due to Li + being smaller than Na + and thus decomposition-recrystallization cycles being more reversible during cycling in the Li +-cell.

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Facile synthesis and shape evolution of highly symmetric 26-facet polyhedral microcrystals of Cu2O

Cited by 51 publications

References 43 publications

Synthesis of Ag₂O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties

Synthesis of Ag₂O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties

Facile synthesis, shape evolution and magnetic properties of polyhedral 50-facet Fe₃O₄nanocrystals partially enclosed by {311} high-index planes

Evaluation of Low-cost Natrochalcite Na[Cu2(OH)(H2O)(SO4)2] as an Anode Material for Li- and Na-ion Batteries

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Facile synthesis and shape evolution of highly symmetric 26-facet polyhedral microcrystals of Cu2O

Cited by 51 publications

References 43 publications

Synthesis of Ag2O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties

Synthesis of Ag2O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties

Facile synthesis, shape evolution and magnetic properties of polyhedral 50-facet Fe3O4nanocrystals partially enclosed by {311} high-index planes

Evaluation of Low-cost Natrochalcite Na[Cu2(OH)(H2O)(SO4)2] as an Anode Material for Li- and Na-ion Batteries

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Synthesis of Ag₂O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties

Synthesis of Ag₂O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface Properties

Facile synthesis, shape evolution and magnetic properties of polyhedral 50-facet Fe₃O₄nanocrystals partially enclosed by {311} high-index planes