Self-Assembly of ZnO: From Nanodots to Nanorods

Pacholski, Claudia; Kornowski, Andreas; Weller, Horst

doi:10.1002/1521-3773(20020402)41:7<1188::aid-anie1188>3.0.co;2-5

Cited by 1,839 publications

(1,595 citation statements)

References 20 publications

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“…Most ZnO NDs reported previously were produced by wet chemical methods 25,31 or by pulsed laser deposition. 30 The present ZnO NDs, in contrast, have evolved from ultra-thin NRs as a result of the etching effect of ammonia in combination with the influence of TEOS during silica coating.…”

Section: Resultsmentioning

confidence: 99%

“…The very recent literature contains several reports of NRs (and nanotubes) decorated by NDs and their possible application in quantum dot-sensitized solar cells, 15 in photocatalysts, 16 in bio-sensing 17 and in singlephoton sources. 18 The family of nanoscale zinc oxide (ZnO) structures, including ZnO nanorods/nanowires, [19][20][21][22] nanotubes, 23 nanobelts 24 and nanodots, 25 has stimulated huge interest over the last decade. [26][27][28] ZnO NDs have attracted particular attention, given their size and possible quantum confinement effects, and have shown performance in light emission devices 29,30 and in cell labeling.…”

Section: Introductionmentioning

confidence: 99%

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Arrays of nanorods composed of ZnO nanodots exhibiting enhanced UV emission and stability

Yin

Sun

et al. 2014

Nanoscale

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Arrays of nanorods composed of ZnO nanodots exhibiting enhanced UV emission and stability

Yin

Sun

et al. 2014

Nanoscale

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“…In the classical models,can also play an important role in the growth process [13][14][15][16][17]. For instance, oriented attachment was proposed as a growth mechanism to account for the formation of aggregates, nanorods, or nanowires for various metals and metal oxides [18][19][20][21][22][23]. Using in situ transmission electron microscopy (TEM), Alivisatos and co-workers recently provided direct evidence for the involvement of particle coalescence in the growth of Pt nanocrystals [24].…”

Section: Introductionmentioning

confidence: 99%

New insights into the growth mechanism and surface structure of palladium nanocrystals

et al. 2010

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This paper presents a systematic study of the growth mechanism for Pd nanobars synthesized by reducing Na 2 PdCl 4 with L-ascorbic acid in an aqueous solution in the presence of bromide ions as a capping agent. Transmission electron microscopy (TEM) and high-resolution TEM analyses revealed that the growth at early stages of the synthesis was dominated by particle coalescence, followed by shape focusing via recrystallization and further growth via atomic addition. We also investigated the detailed surface structure of the nanobars using aberration-corrected scanning TEM and found that the exposed {100} surfaces contained several types of defects such as an adatom island, a vacancy pit, and atomic steps. Upon thermal annealing, the nanobars evolved into a more thermodynamically favored shape with enhanced truncation at the corners. KEYWORDSPalladium, nanocrystals, growth, coalescence, surface evolution Metal nanocrystals have attracted growing attention due to their fascinating properties and invaluable applications in catalysis, photonics, sensing, and imaging [1][2][3]. The physicochemical properties of a metal nanocrystal are determined by a set of parameters such as shape, size, and composition. In particular, shape control of a metal nanocrystal can provide a versatile avenue for tailoring its catalytic activity and selectivity because shape determines the arrangements of atoms on the surface [4][5][6][7][8]. For example, it has been shown that Pd nanocubes bounded by {100} facets can provide a four-fold improvement in specific activity for the formic acid oxidation reaction as compared to Pd octahedra bounded by {111} facets [9]. An exquisite shape control of metal nanocrystals is therefore essential for the maximization of their activity and thus their performance in many catalytic and electrocatalytic applications.In order to achieve a high-level control over the shape of metal nanocrystals prepared in a solution phase, a fundamental understanding of nucleation and growth mechanisms is a prerequisite. In the classical models, nanocrystals have been considered to grow by atomic addition [10][11][12]. However, recent experimental and theoretical studies have shown that particle coalescence Nano Res (2010) 3: 180-188 DOI 10.1007/s12274-010-1021-5 Research Article † These two authors contributed equally to this work.Address correspondence to Younan Xia, xia@biomed.wustl.edu; Jingyue Liu, liuj@umsl.edu Nano Res (2010) 3: 180-188 181 can also play an important role in the growth process [13][14][15][16][17]. For instance, oriented attachment was proposed as a growth mechanism to account for the formation of aggregates, nanorods, or nanowires for various metals and metal oxides [18][19][20][21][22][23]. Using in situ transmission electron microscopy (TEM), Alivisatos and co-workers recently provided direct evidence for the involvement of particle coalescence in the growth of Pt nanocrystals [24]. Despite these studies, however, a detailed description of the growth process is still missing, especially for...

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“…More advanced one-, two-, and three-dimensional superstructures have been constructed for practical device applications using nanocrystals as building blocks. For example, oriented attachment of preformed nanocrystals allows the formation of one-dimensional nanostructures of various materials, such as Ag [6], ZnO [7], ZnS [8], PbSe [9], PbTe [10], and CdTe [11]. Two-dimensional nematic and smectic liquid-crystalline phases [12] have been obtained by Langmuir-Blodgett assembly of BaCr 2 O 4 nanorods, whilst a water-droplet assisted self-assembly of nanocrystals generated various combinatorial hierarchically ordered two-dimensional architectures [13].…”

Section: Introductionmentioning

confidence: 99%

Efficient synthesis of PbTe nanoparticle networks

et al. 2010

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The synthesis of semiconductor nanocrystalline networks using weak capping ligands in aqueous media has been demonstrated. Carbohydrates, including β-cyclodextrin, D-(+)-glucose, D-glucosamine, lactobionic acid, sucrose, and starch were chosen as weak ligands to facilitate the formation of PbTe nanoparticle networks. The nanoparticle size, ranging from 5 nm to 30 nm, can be tuned by manipulating the temperature and concentration. Through a similar strategy, more complicated nanostructures including carbohydrate spheres@PbTe core-shell structures and Te@carbohydrate@PbTe multilayered submicron cables have been fabricated. This is a general approach which can be easily extended to the fabrication of other semiconductor networks, including PbSe and Bi 2 Te 3 using carbohydrates and ethylenediaminetetraacetic acid (EDTA), respectively, as ligands.

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Self-Assembly of ZnO: From Nanodots to Nanorods

Cited by 1,839 publications

References 20 publications

Arrays of nanorods composed of ZnO nanodots exhibiting enhanced UV emission and stability

Arrays of nanorods composed of ZnO nanodots exhibiting enhanced UV emission and stability

New insights into the growth mechanism and surface structure of palladium nanocrystals

Efficient synthesis of PbTe nanoparticle networks

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