A New Route toward ZnO Hollow Spheres by a Base-Erosion Mechanism

Chen, Zhitao; Gao, Lian

doi:10.1021/cg070277b

Cited by 73 publications

(56 citation statements)

References 35 publications

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“…It should be mentioned that the whole hollow structure evolution process in our experiment was similar to the inside-out ripening mechanism proposed by Lou and Archer [8]. Recently, there were several studies focusing on the synthesis of hollow strucures using template-based methods [9,[27][28][29][30][31]. Various mechanisms were also proposed including the Kirkendall effect [27], hydrophobic interaction [28][29][30], oriented attachment [9], and base-erosion [31].…”

Section: The Formation Mechanism Of the Sno 2 Hollow Micro-spheressupporting

confidence: 77%

Selective synthesis of SnO2 hollow microspheres and nano-sheets via a hydrothermal route

Guo

Tan

et al. 2010

Chin. Sci. Bull.

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We report a mild template-free hydrothermal route for selective synthesis of SnO 2 hollow microspheres and nano-sheets using SnCl 2 and NaOH as initial materials. By switching the solvent from water to ethanol, the formed SnO 2 nanostructures changed from nano-sheets to hollow microspheres. The obtained nano-sheets were single crystalline in structure. On the basis of the characterization of intermediate products, the formation of SnO 2 hollow microspheres was ascribed to a crystal growth process, while the formation of SnO 2 nano-sheets was ascribed to the oxidation of SnO 2 sheets during the hydrothermal process. Further characterization of the SnO 2 hollow microspheres and nano-sheets by X-ray photoelectron spectroscopy and UV-Vis absorption spectroscopy reveals different optical absorption properties and valence band electronic structures. In addition, the SnO 2 nano-sheets and hollow microspheres exhibit different sensing properties. The present work provides a facile and simple template-free method for the synthesis of nano-structured SnO 2 . SnO 2 , hydrothermal, nanostructure, sensing Citation: Li Y, Guo Y Q, Tan R Q, et al. Selective synthesis of SnO 2 hollow microspheres and nano-sheets via a hydrothermal route.Recently, nano-scale materials have attracted much attention because of their excellent and fascinating properties. Synthesis of nano-materials with controlled morphology, size, chemical composition and crystal structure is of great significance in nano-technological applications. As an n-type wide-bandgap semiconductor, SnO 2 is an important functional material, which has been extensively used in gas sensors and optoelectronic devices [1][2][3][4][5][6][7]. In recent years, SnO 2 nanostructures with various geometrical morphologies have been reported, including hollow structures, nano-belt/ wire/tubes/rods, nano-diskettes, nano-sheets, and nano-particles [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Various preparation methods have been explored, including hydrothermal methods, thermal evaporation, sol-gel methods, co-precipitation, and direct oxidation [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. The hydrothermal processes, especially starting from aqueous solutions, are the most widely investigated.To control the morphology of SnO 2 , template-assisted methods were usually adopted in previous studies. The use of templates has some disadvantages such as high cost and tedious synthetic procedures, which may limit their large-scale applications. However, experimental trials for the SnO 2 preparation by template-free routes are inadequate. The control of morphology using template-free hydrothermal routes for synthesis of SnO 2 nanostructure is still challenging. In this paper, we demonstrate a novel template-free (or surfactant-free) hydrothermal process for the selective synthesis of SnO 2 hollow microspheres and nano-sheets by simply changing the solvent. Their optical and electronic structural properties are also presented.

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Section: The Formation Mechanism Of the Sno 2 Hollow Micro-spheressupporting

confidence: 77%

Selective synthesis of SnO2 hollow microspheres and nano-sheets via a hydrothermal route

Guo

Tan

et al. 2010

Chin. Sci. Bull.

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“…They proposed a self-assembly/base-erosion mechanism for the formation of the nanostructured hollow spheres [167]. [172,173].…”

Section: Hydrothermal Crystal Growthmentioning

confidence: 99%

Hydroxylapatite nanoparticles: fabrication methods and medical applications

Okada

Furuzono

2012

Science and Technology of Advanced Materials

122

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Hydroxylapatite (or hydroxyapatite, HAp) exhibits excellent biocompatibility with various kinds of cells and tissues, making it an ideal candidate for tissue engineering, orthopedic and dental applications. Nanosized materials offer improved performances compared with conventional materials due to their large surface-to-volume ratios. This review summarizes existing knowledge and recent progress in fabrication methods of nanosized (or nanostructured) HAp particles, as well as their recent applications in medical and dental fields. In section 1, we provide a brief overview of HAp and nanoparticles. In section 2, fabrication methods of HAp nanoparticles are described based on the particle formation mechanisms. Recent applications of HAp nanoparticles are summarized in section 3. The future perspectives in this active research area are given in section 4.

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“…This mechanism was also suggested for the formation of ZnO hollow spheres. [42] The base-erosion mechanism involves initial nucleation, growth, aggregation, and erosion. At the initial stage, the HA nanorods are first formed by nucleation and the nanorod-like morphology is shaped due to the anisotropy of HA.…”

Section: Resultsmentioning

confidence: 99%

Solvothermal Synthesis and Characterization of Hierarchically Nanostructured Hydroxyapatite Hollow Spheres

Zhu

2009

Eur J Inorg Chem

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Hierarchically nanostructured hydroxyapatite (HA) hollow spheres assembled from nanorods have been successfully synthesized using CaCl2, NaH2PO4, and potassium sodium tartrate via a solvothermal method at 200 °C for 24 h in water/N,N‐dimethylformamide (DMF) mixed solvents. The ratio of water to DMF plays a key role in the formation of hierarchically nanostructured HA hollow spheres. The potassium sodium tartrate was used as a chelating ligand and a template molecule in the synthesis and self‐assembly of HA nanorods. The products were characterized by X‐ray powder diffraction, and field‐emission scanning electron microscopy (FESEM), transmission electron microscopy, high‐resolution transmission electron microscopy (HRTEM), energy‐dispersive X‐ray spectra (EDS), Brunauer–Emmett–Teller (BET), and Fourier transform infrared spectrometry. FESEM and TEM images indicated that hollow spheres of about 3.6 μm in diameter were built by HA nanorods. On the basis of experimental results, a possible formation mechanism of these hierarchically nanostructured HA hollow spheres in the growth processes was proposed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)

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A New Route toward ZnO Hollow Spheres by a Base-Erosion Mechanism

Cited by 73 publications

References 35 publications

Selective synthesis of SnO2 hollow microspheres and nano-sheets via a hydrothermal route

Selective synthesis of SnO2 hollow microspheres and nano-sheets via a hydrothermal route

Hydroxylapatite nanoparticles: fabrication methods and medical applications

Solvothermal Synthesis and Characterization of Hierarchically Nanostructured Hydroxyapatite Hollow Spheres

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