Synthesis of Spheres with Complex Structures Using Hollow Latex Cages as Templates

Zhu

et al. 2007

Adv Funct Materials

521

344

Hierarchical assembly of hollow microstructures is of great scientific and practical value and remains a great challenge. This paper presents a facile and one‐pot synthesis of Cu2O microspheres with multilayered and porous shells, which were organized by nanocrystals. The time‐dependent experiments revealed a two‐step organization process, in which hollow microspheres of Cu2(OH)3NO3 were formed first due to the Ostwald ripening and then reduced by glutamic acid, the resultant Cu2O nanocrystals were deposited on the hollow intermediate microspheres and organized into finally multishell structures. The special microstructures actually recorded the evolution process of materials morphologies and microstructures in space and time scales, implying an intermediate‐templating route, which is important for understanding and fabricating complex architectures. The Cu2O microspheres obtained were used to fabricate a gas sensor, which showed much higher sensitivity than solid Cu2O microspheres.

“…There have been the similar reports about the formation of double shells by the simultaneous growth from inside and outside in the preparation of some hollow inorganic materials. [11,26] …”

Section: Full Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

One‐Pot Synthesis and Hierarchical Assembly of Hollow Cu₂O Microspheres with Nanocrystals‐Composed Porous Multishell and Their Gas‐Sensing Properties

Zhu

et al. 2007

Adv Funct Materials

521

344

“…Though the process is complex, several kinds of multishell spheres have still been successfully synthesized by this method. Yang et al have used hollow latex cages (HLCs) as templates to fabricate composite hollow spheres with complex structures [86]. The route of the synthesis process is shown in Figure 10(a) [86].…”

Section: Other Special Properties Related To Multilevel Structurementioning

confidence: 99%

Bioinspired synthesis and preparation of multilevel micro/nanostructured materials

2010

In this review, some living organisms with multilevel hierarchical micro/nanostructures and related special properties are briefly introduced. The unique properties of organisms are mostly related to their special hierarchical micro/nanostructures. Inspired by nature, many zero-dimensional and one-dimensional micro/nanomaterials with biomimic or bioinspired multilevel micro/nanostructures have been successfully synthesized and prepared in recent years. Compared with traditional solid materials, the synthesis and preparation of these multilevel structured materials is more ingenious. Moreover, these kinds of multilevel micro/nanomaterials show fantastic properties in many fields because of their micro/nanoscale complex interior structures, which may be intended for application in catalysis, Li-ion batteries, biomedicines, sensors, and others.

“…Their wide potential applications in transportation systems of carriers, photonic crystals, filling agents, catalysts, microreactors and fuel cells are causing increasing interest [1][2][3][4][5]. Some preparations of hollow spheres have been reported, including the templating method using silicon dioxide [6] or polystyrene spheres [7], inducing with triblock copolymers [8], preparing in emulsion/microemulsion [10,11], and solvothermal methods.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnS hollow nanospheres with holes using different amine templates

Tang

et al. 2008

Front. Chem. China

ZnS hollow nanospheres with holes were prepared by reacting ZnSO 4 with H 2 S, the sulfide source formed in the reaction of CS 2 with ethylenediamine, 1,3-propylenediamine, butylamine or 2-(2-aminoethylamino) ethanol, which also acted as a template agent, at 50uC under agitation. The shape, particle size of about 100-850 nm and hole size of about 150-600 nm of ZnS hollow nanospheres with holes were shown by SEM and TEM images. These ZnS nanospheres with b cubic ZnS phase and composed of 2-5 nm nanocrystals were characterized by XRD and HRTEM. The blue shift of maximum absorption in UV-vis displayed the effect of quantum size. The two amino groups of amine templates reacted favorably with Zn 2+ to form uniform and relatively smooth ZnS nanospheres with holes, while hydroxyethyl played a disadvantageous role. A reasonable mechanism of hole formation by H 2 S rushing out is suggested.