Shape‐Controlled Synthesis of Zinc Oxide: A Simple Method for the Preparation of Metal Oxide Nanocrystals in Non‐aqueous Medium

Zhang, Zhihua; Lu, Mingyue; Xu, Hongwei; Chin, Wee-Shong

doi:10.1002/chem.200600293

Cited by 114 publications

(86 citation statements)

References 49 publications

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“…The amine here plays the role of activating agent; it is proposed that the amine molecule may behave as a nucleophile and attack the electron deficient carbon of the carbonyl group of acetate as shown in the above equation. An addition-elimination process will thus follow to generate the ZnO monomers [20].…”

Section: Morphological Compositional Analysis and Growth Kineticsmentioning

confidence: 99%

From zinc oxide nanoparticles to microflowers: A study of growth kinetics and biocidal activity

Ramani

Ponnusamy

Muthamizhchelvan

2012

Materials Science and Engineering: C

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Section: Morphological Compositional Analysis and Growth Kineticsmentioning

confidence: 99%

From zinc oxide nanoparticles to microflowers: A study of growth kinetics and biocidal activity

Ramani

Ponnusamy

Muthamizhchelvan

2012

Materials Science and Engineering: C

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“…Besides, in the case of Znacac spectrum the band at 1440 cm À1 attributed to the asymmetric C]O stretching mode is slightly redshifted by 20 cm À1 when the BAPPG was added to the sol. The above findings suggest that amine groups could behave like a nucleophile and attack electron-deficient carbon of carbonyl group of acetate [36]. Furthermore, as it can be also proved by the evidences of microscopy technique the amine groups in combination with oligomer chain could also behave as a template to the final formation of the ZnO nanostructure.…”

Section: Resultsmentioning

confidence: 75%

Thin ZnO nanocrystalline films for efficient quasi-solid state electrolyte quantum dot sensitized solar cells

Karageorgopoulos

Σταθάτος²,

Vitoratos

2012

Journal of Power Sources

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“…In analogy with the addition-elimination mechanism proposed by Zhang et al, 16 we suggest that ZnO formation from Zn(NO 3 ) 2 is aided by HDA through the electron transfer process (Fig. 2).…”

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confidence: 56%

Nanorod to quantum dot conversion in ZnO dispersions with co-surfactants

Jacob

Thomas

2015

RSC Adv.

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A chemically-induced nanorod to quantum dot transition is reported in ZnO. This transition is achieved using co-surfactants in a marginally polar solvent in chimie douce (soft chemical) conditions. This is different from the physical instability driven transitions reported so far in metal nanowires and polymers. We propose a suitable mechanism for the observed phenomenon.In the nano regime, a wide range of nanostructures have been reported; (i) 0-D (e.g. quantum dots), 1 (ii) 1-D (e.g. nanorods, nanotube, nanowires etc.), 2,3 (iii) 2-D (e.g. planar triangles, plates, discs etc.) 4 and (iv) 3-D (e.g. cubes, prism, tetrahedral, octahedral etc.). 5,6 Materials that are studied most extensively include noble metals, 7 and chalcogenides. 8 In reports so far, morphology transition from one shape to another is oen explained using orientation attachment, Ostwald ripening, digestive ripening, or some combination of these. However a purely chemical method for top-down nanosizing of a 1-D system is hitherto unreported for any inorganic system. In fact this transition is not expected since this morphology transition is completely counter to the one dictated by grain growth mechanisms reported so far. It is in this context that this study becomes signicant. It may be noted that a physical approach to 1-D to 0-D transition, which is driven by Rayleigh instability, have been reported in case of metal nanoparticles and polymers. 9-13 However this phenomenon has never been reported in chalcogenides. These reported transitions have always been thermally activated, and occur due to perturbations in the system. A purely chemical approach to transition remains hitherto unreported. Also a 1-D to 0-D transition has never been observed in an oxide.In this work, we show a novel transition of ZnO nanorod to monodisperse quantum dots (i.e. 1-D to 0-D morphology transition). ZnO is chosen since it is an applied material with several applications. 14,15 To achieve this transition in ZnO, we use carefully chosen co-surfactants (hexadecylamine (HDA) and triethanolamine (TEA)) in a marginally polar solvent DCE (1,2-dichloroethane). The morphological transition occurs over a period of 24 hours at room temperature. The method to obtain this morphology transition is green, so (i.e. chimie douce, which means employing low temperature), and facile. Furthermore we would like to point to the fact that here ZnO is obtained via decomposition of Zn(NO 3 ) 2 precursor in DCE at $80 C. To the best of our knowledge this is the rst report on ZnO formation via decomposition of Zn(NO 3 ) 2 in an amine mediated reaction. This is achieved without any use of external oxygen sources.ZnO reported here is synthesized using Zn(NO 3 ) 2 $6H 2 O (98.0%), hexadecylamine (HDA) (98.0%), 1,2-dichloroethane (DCE) (99.0-99.5%) and triethanolamine (TEA) (99.0%). These chemicals are used without further purication. Synthesis of ZnO is carried out at 80 C by use of a reux setup. Silicone oil bath is used to maintain the reaction temperature. We always start with freshly p...

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Shape‐Controlled Synthesis of Zinc Oxide: A Simple Method for the Preparation of Metal Oxide Nanocrystals in Non‐aqueous Medium

Cited by 114 publications

References 49 publications

From zinc oxide nanoparticles to microflowers: A study of growth kinetics and biocidal activity

From zinc oxide nanoparticles to microflowers: A study of growth kinetics and biocidal activity

Thin ZnO nanocrystalline films for efficient quasi-solid state electrolyte quantum dot sensitized solar cells

Nanorod to quantum dot conversion in ZnO dispersions with co-surfactants

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