Control of ZnO Crystallization by a PEO-<i>b</i>-PMAA Diblock Copolymer

Öner, Mualla; Norwig, Jochen; Meyer, Wolfgang; Wegner, Gerhard

doi:10.1021/cm970450z

Cited by 194 publications

(157 citation statements)

References 19 publications

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“…Twinned structures are very commonly formed by wet chemical methods [83,111,[191][192][193]. Typical twinned ZnO structures [174] are shown in Fig.…”

Section: Twinningmentioning

confidence: 99%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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One-dimensional (1D) ZnO nanostructures have been studied intensively and extensively over the last decade not only for their remarkable chemical and physical properties, but also for their current and future diverse technological applications. This article gives a comprehensive overview of the progress that has been made within the context of 1D ZnO nanostructures synthesized via wet chemical methods. We will cover the synthetic methodologies and corresponding growth mechanisms, different structures, doping and alloying, positioncontrolled growth on substrates, and finally, their functional properties as catalysts, hydrophobic surfaces, sensors, and in nanoelectronic, optical, optoelectronic, and energy harvesting devices.

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“…Twinned structures are very commonly formed by wet chemical methods [83,111,[191][192][193]. Typical twinned ZnO structures [174] are shown in Fig.…”

Section: Twinningmentioning

confidence: 99%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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“…Typically, this synthetic method involves the hydrolysis of zinc salts with strong bases (e.g., NaOH, LiOH, KOH, or tetramethylammonium hydroxide) as an oxygen source in an alcoholic medium, and the polycondensation of metastable Zn(OH) 2 into ZnO crystals. The major problem of sol-gel routes is the uncontrolled reaction rates of the hydrolysis and condensation steps, resulting in the formation of precipitates with a high degree of structural defects.…”

Section: Introductionmentioning

confidence: 99%

Precipitation of monodisperse ZnO nanocrystals via acid-catalyzed esterification of zinc acetate

et al. 2006

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A wet-chemical method to produce zinc oxide nanocrystals of monodisperse size distribution (diameter range of 20-80 nm) is presented. The synthesis starts from zinc acetate dihydrate which is converted to ZnO in the presence of 1-pentanol in m-xylene at 130 uC. We report for the first time catalysis of this reaction by p-toluene sulfonic acid monohydrate (p-TSA), which allows a shorter reaction time and improves both the reproducibility of the particle size distribution and the crystallinity of the particles. The reaction can be scaled up to give multigram quantities of product per batch. Particles were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and photoluminesence (PL) spectroscopy. Room temperature PL spectra of ZnO prepared without catalyst exhibit a strong and sharp UV emission band at ca. 385 nm and a weak and very broad green-yellow visible emission centered at ca. 550-560 nm. However, for nanoparticles precipitated in the presence of p-TSA, the UV emission is enhanced by a factor of 4, which can be correlated with the improvement of crystal perfection. A particle formation mechanism is discussed.

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“…) as well as various polymeric agents 22 and surfactants 23 can be helpful in defining the growth directions by capping/modifying the basic building units.…”

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confidence: 99%

Microwave-assisted synthesis of ZnO micro-javelins

et al. 2009

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The microwave (MW)-assisted formation of ZnO micro-javelins from zinc nitrate and urea in aqueous solution is described. The particles (named as 'micro-javelins' because of their high aspect ratio and needle-like tips) grow hexagonally with well-defined facets in the h01 10i direction and pointed tips in (0001) direction. Powder X-ray diffraction patterns show the appearance of a strikingly dominant (1000) orientation. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations reveal the morphological evolution of these hexagonal ZnO particles with time. The effect of precursor concentrations, counterion type and MW irradiation power and their consequent influence on pH and Zn 2+ ion concentration are investigated. A mechanism for the formation of the micro-javelins is postulated. The microwave induced supersaturation of Zn(OH) + species under the weakly basic pH condition and the initial growth through the (000 1) direction (oxygen-rich face) are proposed to be the key factors that dictate the formation of these ZnO micro-javelins. The present one-step microwave process is a straightforward and a reproducible method for the bulk synthesis of defect-free ZnO micro-javelins, which would find potential applications in microelectronic devices (e.g. lasers, cantilevers in surface probing equipment, etc.).

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Control of ZnO Crystallization by a PEO-b-PMAA Diblock Copolymer

Cited by 194 publications

References 19 publications

One-dimensional ZnO nanostructures: Solution growth and functional properties

One-dimensional ZnO nanostructures: Solution growth and functional properties

Precipitation of monodisperse ZnO nanocrystals via acid-catalyzed esterification of zinc acetate

Microwave-assisted synthesis of ZnO micro-javelins

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