Polymer-Controlled Crystallization of Zinc Oxide Hexagonal Nanorings and Disks

Peng, Yin; Xu, An‐Wu; Deng, Bin; Antonietti, Markus; Cölfen, Helmut

doi:10.1021/jp056246d

Cited by 269 publications

(245 citation statements)

References 41 publications

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“…Arya et al [15] demonstrated that ZnO crystals exhibit different biosensor properties corresponding to their shape changes. Up to now, many different ZnO micro and nanostructures have been reported [16][17][18][19][20][21]. However, developing a facile, environment-friendly method to synthesize ZnO crystals with well defined complex morphology is still a major challenge.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of hierarchical ZnO microstructures with enhanced photocatalytic activity

Miao

Shi

Nawrat

et al. 2017

Materials Science-Poland

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Flower-like ZnO microstructures were successfully synthesized via a facile hydrothermal route without using any surfactants. The morphology of these microstructures can be easily controlled by adjusting the pH of the reaction solution. The possible growth mechanism of ZnO hierarchical microstructures was proposed based on the X-ray powder diffraction (XRD) and scanning electron microscope (SEM) results. The photocatalytic activity studies of ZnO nanocrystals demonstrated their excellent photocatalytic performance in degrading aqueous methylene blue (MB) under UV-A light irradiation. This higher photocatalytic activity of the ZnO nanoplates was mainly attributed to the exposed facets with the higher surface energy.

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of hierarchical ZnO microstructures with enhanced photocatalytic activity

Miao

Shi

Nawrat

et al. 2017

Materials Science-Poland

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“…88 Several works of ours have been conducted to pursue the morphology evolution and to clarify a complex problem derived from the metamorphic features in the morphology of ZnO during soaking in aqueous solutions. 85,109,121 The studies have shown that both specific solution chemistry and treatment parameters such as temperature, time, and pH have effects on the growth by selective promotion or prohibition of some characteristically crystalline planes. 85,109,121 With a solution containing hexamethylenetetramine and ammonia, the solution pH can be controlled by releasing OH À from the decomposition of hexamethylenetetramine during incubation.…”

Section: Morphological Evolution In Solutionmentioning

confidence: 99%

Nano/Micro Patterning of Inorganic Thin Films

Koumoto¹,

Saito²,

Gao³

et al. 2008

Bulletin of the Chemical Society of Japan

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The present review is focused on the site-selective deposition of inorganic thin films on self-assembled monolayer (SAM) templates. SAMs were used to modify the substrate surface with chemical functional groups. The patterned SAM substrate was prepared by exposing the SAM substrate to UV light through photomasks for photocleavage. The patterned SAM was used as the templates for deposition of ceramic thin films in aqueous solutions. The preparation and characterization methods of SAMs, and the preparation of the patterned SAM templates are explained. Solution chemistry for the deposition of ceramic oxides and the physics and chemistry of interfaces are described. Experimental examples are given to explain how these aspects influence the formation of films and their properties. Various examples of site-selective deposition of ceramic oxides on SAM templates are explained with classification into three categories: patterning by site-selective attachment of homogeneously nucleated particles, patterning by surface-selective heterogeneous nucleation and growth, and patterning by catalyst-induced heterogeneous nucleation. We also describe pattern-deposition on flexible substrates and future views to improve the pattern resolution.

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“…Actually, thin films of ZnO have a great deal of interest for applications as photovoltaic cells. 20) Furthermore, the formation of organic-inorganic hybrid films is impossible due to the steric hindrance of the PAM blocks.…”

Section: Zno Nanorods Grown From the Seeds On A Substratementioning

confidence: 99%

Morphology control of ZnO nanostructures

Mezy

Gérardin

Tichit

et al. 2008

J. Ceram. Soc. Japan

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Highly crystalline zinc oxide (ZnO) nanomaterials are synthesized using a seeded growth sol-gel method. In order to control the morphology and the dimensionality of ZnO crystals, a double hydrophilic block copolymer, the Polyacrylic acid-Polyacrylamide (PAA-PAM), was introduced during the growth step. It was shown, first, that depending on the amount of PAA-PAM copolymer, different morphologies of ZnO particles precipitated from homogeneous solutions were obtained, such as ZnO nanostructured spheres or flat hexagonal crystals. Secondly, the dimensionality of ZnO objects grown from seeds on a substrate could be tuned by varying the amount of copolymer leading to ZnO films with variable characteristics. Thus, systematic studies were done in order to investigate the influence of copolymer addition on ZnO nanomaterial morphologies and then explain the mechanisms of the morphological and dimensional modifications. Key-words : ZnO nanoparticles, Films, Sol-gel, Semiconductor, Nanostructuration, Polymers [Received December 10, 2007; Accepted January 17, 2008] 1. Introduction Zinc oxide is a II-VI semiconductor with an hexagonal wurtzite crystal structure, which presents a direct wide bandgap of 3.37 eV 1) at room temperature and a large exciton binding energy of 60 meV.2) ZnO exhibits a large variety of nanoscale behaviours, both in terms of structural and physical properties. Much attention has been paid to nanostructured ZnO materials, due to their potential use for electronic, photonic, catalytic, and sensor applications.3)-5) Among low dimensionality (1D) semiconductors, ZnO nanorods are of special interest for their applications as high efficiency short wavelength optoelectronic nanodevices because of their large excitonic binding energy and high mechanical and thermal stabilities.Due to their physical and chemical properties, ZnO nanorods present a great economic interest. Many methods have been employed for the growth of ZnO nanomaterials, such as rf magnetron sputtering, 6) chemical vapor deposition, 7) spray pyrolysis, 8) thermal evaporation 9) etc. However, low cost and simplicity of the synthesis processes are required for commercial development. The wet chemical synthesis route seems to meet these requirements, enabling the preparation of ZnO nanorods with a high crystalline quality and a proper growth orientation. The synthesis process used in this study declines into two steps. The first one is the synthesis of ZnO nanoparticles, which once deposited on a substrate, will be used in the second step as seeds for the subsequent growth of ZnO structures. The objective is to control the morphology of ZnO structures in order to improve their properties and consequently fit to further applications. Our first objective was to grow well dispersed and individual crystals with different morphologies. The second objective was to be able to modify the dimensionality of ZnO crystals grown form seeds on a substrate. For that, a hydrophilic polyacrylic acid-b-polyacrylamide diblock copolymer was introduced during the ...

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Polymer-Controlled Crystallization of Zinc Oxide Hexagonal Nanorings and Disks

Cited by 269 publications

References 41 publications

Facile synthesis of hierarchical ZnO microstructures with enhanced photocatalytic activity

Facile synthesis of hierarchical ZnO microstructures with enhanced photocatalytic activity

Nano/Micro Patterning of Inorganic Thin Films

Morphology control of ZnO nanostructures

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