Temperature-dependent growth mechanisms of low-dimensional ZnO nanostructures

CrystEngComm ◽  
2011 ◽  
Vol 13 (10) ◽  
pp. 3455 ◽  
Author(s):  
Qijin Cheng ◽  
Kostya (Ken) Ostrikov
Keyword(s):  
Zno Nanostructures ◽  
Growth Mechanisms ◽  
Temperature Dependent ◽  
Dependent Growth ◽  
Low Dimensional

Temperature-dependent growth mechanisms of CaF2 on Si(111)

2004 ◽  
Vol 22 (5) ◽  
pp. 2182-2187 ◽  
Author(s):  
C. R. Wang ◽  
B. H. Müller ◽  
E. Bugiel ◽  
K. R. Hofmann
Keyword(s):  
Growth Mechanisms ◽  
Temperature Dependent ◽  
Dependent Growth

Growth and Structure of Carbide Nanorods

1995 ◽  
Vol 410 ◽  
Author(s):  
Charles M. Lieber ◽  
Eric W. Wong ◽  
Hongjie Dai ◽  
Benjamin W. Maynor ◽  
Luke D. Burns
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Mechanism ◽  
Growth Direction ◽  
Future Research ◽  
Growth Mechanisms ◽  
Temperature Dependent ◽  
Research Directions ◽  
Solid Carbide ◽  
Future Research Directions ◽  
Dependent Growth

ABSTRACTRecent research on the growth and structure of carbide nanorods is reviewed. Carbide nanorods have been prepared by reacting carbon nanotubes with volatile transition metal and main group oxides and halides. Using this approach it has been possible to obtain solid carbide nanorods of TiC, SiC, NbC, Fe3C, and BCx having diameters between 2 and 30 nm and lengths up to 20 µm. Structural studies of single crystal TiC nanorods obtained through reactions of TiO with carbon nanotubes show that the nanorods grow along both [110] and [111] directions, and that the rods can exhibit either smooth or saw-tooth morphologies. Crystalline SiC nanorods have been produced from reactions of carbon nanotubes with SiO and Si-iodine reactants. The preferred growth direction of these nanorods is [111], although at low reaction temperatures rods with [100] growth axes are also observed. The growth mechanisms leading to these novel nanomaterials have also been addressed. Temperature dependent growth studies of TiC nanorods produced using a Ti-iodine reactant have provided definitive proof for a template or topotactic growth mechanism, and furthermore, have yielded new TiC nanotube materials. Investigations of the growth of SiC nanorods show that in some cases a catalytic mechanism may also be operable. Future research directions and applications of these new carbide nanorod materials are discussed.

scholarly journals Direct observation of epitaxial organic film growth: temperature-dependent growth mechanisms and metastability

2015 ◽  
Vol 17 (43) ◽  
pp. 29150-29160 ◽  
Author(s):  
Helder Marchetto ◽  
Thomas Schmidt ◽  
Ullrich Groh ◽  
Florian C. Maier ◽  
Pierre L. Lévesque ◽  
...  
Keyword(s):  
Direct Observation ◽  
Growth Temperature ◽  
Film Growth ◽  
Growth Dynamics ◽  
Organic Films ◽  
Growth Mechanisms ◽  
Organic Film ◽  
Temperature Dependent ◽  
Dependent Growth

Growth dynamics and structures of organic films, and hence their properties, strongly depend on temperature and substrate morphology, as shown for the example PTCDA on Ag(111).

scholarly journals Temperature-dependent growth mode of W-doped ZnO nanostructures

2011 ◽  
Vol 257 (14) ◽  
pp. 6226-6232 ◽  
Author(s):  
B.D. Ngom ◽  
M. Chaker ◽  
N. Manyala ◽  
B. Lo ◽  
M. Maaza ◽  
...  
Keyword(s):  
Growth Mode ◽  
Zno Nanostructures ◽  
Temperature Dependent ◽  
Doped Zno ◽  
Dependent Growth

Temperature-dependent growth mode and photoluminescence properties of ZnO nanostructures

2004 ◽  
Vol 399 (4-6) ◽  
pp. 522-526 ◽  
Author(s):  
Dongxu Zhao ◽  
Caroline Andreazza ◽  
Pascal Andreazza ◽  
Jiangang Ma ◽  
Yichun Liu ◽  
...  
Keyword(s):  
Growth Mode ◽  
Zno Nanostructures ◽  
Photoluminescence Properties ◽  
Temperature Dependent ◽  
Dependent Growth

Growth and Optical Properties of ZnO Low-Dimensional Nanostructures

2008 ◽  
Vol 8 (3) ◽  
pp. 1101-1109 ◽  
Author(s):  
Yichun Liu ◽  
Yanhong Tong
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Two Dimensions ◽  
Zno Nanostructures ◽  
Photoluminescence Spectra ◽  
Temperature Dependent ◽  
Room Temperature Photoluminescence ◽  
Low Dimensional ◽  
Low Temperature Photoluminescence ◽  
Temperature Dependent Photoluminescence

Recent studies on the growth of ZnO nanostructures and their optical properties were reviewed. Using different methods, a variety of ZnO nanostructures, including quantum dots nanotowers, nanotubes, nanorods, nanowires, and nanosheets, displaying zero, one, and two dimensions, have been synthesized. The growth of ZnO low-dimensional nanostructures has been demonstrated. Their optical properties have been studied by means of room-temperature photoluminescence spectra, low-temperature photoluminescence spectra, temperature-dependent photoluminescence spectra, and pressure-dependent photoluminescence spectra. The optical properties can be adjusted by the surface features of ZnO low-dimensional nanostructures. The strong exciton emission has been observed in some nanostructures, showing promising potential in nanodevice applications.

scholarly journals A chiral switchable photovoltaic ferroelectric 1D perovskite

2020 ◽  
Vol 6 (9) ◽  
pp. eaay4213 ◽  
Author(s):  
Yang Hu ◽  
Fred Florio ◽  
Zhizhong Chen ◽  
W. Adam Phelan ◽  
Maxime A. Siegler ◽  
...  
Keyword(s):  
Electric Fields ◽  
Mirror Symmetry ◽  
Degrees Of Freedom ◽  
Electrical Measurements ◽  
Temperature Dependent ◽  
Paraelectric Phase Transition ◽  
Strongly Coupled ◽  
Yield Phenomena ◽  
Hybrid Perovskite ◽  
Low Dimensional

Spin and valley degrees of freedom in materials without inversion symmetry promise previously unknown device functionalities, such as spin-valleytronics. Control of material symmetry with electric fields (ferroelectricity), while breaking additional symmetries, including mirror symmetry, could yield phenomena where chirality, spin, valley, and crystal potential are strongly coupled. Here we report the synthesis of a halide perovskite semiconductor that is simultaneously photoferroelectricity switchable and chiral. Spectroscopic and structural analysis, and first-principles calculations, determine the material to be a previously unknown low-dimensional hybrid perovskite (R)-(−)-1-cyclohexylethylammonium/(S)-(+)-1 cyclohexylethylammonium) PbI3. Optical and electrical measurements characterize its semiconducting, ferroelectric, switchable pyroelectricity and switchable photoferroelectric properties. Temperature dependent structural, dielectric and transport measurements reveal a ferroelectric-paraelectric phase transition. Circular dichroism spectroscopy confirms its chirality. The development of a material with such a combination of these properties will facilitate the exploration of phenomena such as electric field and chiral enantiomer–dependent Rashba-Dresselhaus splitting and circular photogalvanic effects.

SHAPE EVOLUTION IN ONE-DIMENSIONAL ZnO NANOSTRUCTURES GROWN FROM ZnO NANOPOWDER SOURCE: VAPOR–LIQUID–SOLID VERSUS VAPOR–SOLID GROWTH MECHANISMS

2011 ◽  
Vol 10 (01n02) ◽  
pp. 75-79 ◽  
Author(s):  
SOUMEN DHARA ◽  
P. K. GIRI
Keyword(s):  
Growth Mechanism ◽  
Growth Temperature ◽  
Shape Evolution ◽  
Zno Nanostructures ◽  
Growth Mechanisms ◽  
Vapor Liquid Solid ◽  
One Dimensional ◽  
Zno Nanopowder ◽  
Simultaneous Growth ◽  
Vapor Liquid

Here we report on the growth and evolution of ZnO nanowires grown from ZnO nanopowder as a source material using a horizontal muffle furnace. The shape evolution has been studied with variation in growth temperature and zinc vapor pressure. The structural analysis on these nanostructures shows c-axis oriented aligned growth. Scanning electron microscopy imaging of these nanostructures revealed the shape evolution from nanowires to nanoribbons and then to nanorods as the growth temperature increases from 650°C to 870°C. At 650°C, only vertical nanowires have been observed and with increase in growth temperature nanowires transform to nanoribbons and then to nanorods at 870°C. And we also observed simultaneous growth of nanorods and nanoribbons under a specific growth condition. We believe that these nanowires and nanorods were formed by vapor–liquid–solid growth mechanism (catalyst-mediated growth), whereas nanoribbons were grown by vapor–solid growth mechanism (without the aid of a metal catalyst). We observed simultaneous occurrence of vapor–liquid–solid and vapor–solid growth mechanisms at a particular growth temperature. These ZnO nanowires exhibit bound exciton related UV emission at ~379 nm, and defect-emission band in the visible region. Possible growth mechanism, shape evolution, and simultaneous growth of two types of one-dimensional ZnO nanostructures under the same growth condition are discussed.

Thickness dependent growth of needle-like and flower-like ZnO nanostructures

2008 ◽  
Vol 20 (8) ◽  
pp. 771-775 ◽  
Author(s):  
S. K. Panda ◽  
N. Singh ◽  
S. Pal ◽  
C. Jacob
Keyword(s):  
Zno Nanostructures ◽  
Dependent Growth
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