Cathodoluminescence of single ZnO nanorod heterostructures

Piechal, Bernard; Yoo, Jinkyoung; El-Shaer, Abdelhamid; Mofor, A. Che; Yi, Gyu‐Chul; Bakin, A.; Waag, A.; Donatini, Fabrice; Dang, Le Si

doi:10.1002/pssb.200675104

Cited by 16 publications

(16 citation statements)

References 5 publications

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“…These defects largely suppress UV emission. Similarly, Piechal et al 28 found that a large amount of lattice defects at the bottom of ZnO nanorods grown on a substrate led to observable variations in CL transitions. In Figure 3c,d, it can be seen that the luminescence from sidewalls (between the rods, Figure 3d) was stronger than that from the top of the rod.…”

Section: Resultsmentioning

confidence: 96%

Renucleation and Sequential Growth of ZnO Complex Nano/Microstructure: From Nano/Microrod to Ball-Shaped Cluster

Yan

Zou

et al. 2010

J. Phys. Chem. C

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Synthesis of complex ZnO architectures with well-controlled morphology and understanding of their growth mechanisms are desirable for both fundamental study of crystal growth and materials optimization for device applications. In the present study, a facile low temperature, chemical solution-based approach was used to prepare ZnO ball-shaped nano/microstructure. The morphological evolution of this unique ball-shaped cluster was characterized using scanning electron microscopy, energy dispersive spectroscopy, and in situ cathodoluminescence. It was found that the renucleation and sequential growth of nanorods occurred on the joint section of two primary one-dimensional ZnO nanorods, resulting in the formation of complex threedimensional ZnO hierarchical architectures through self-assembly. The formation mechanism behind was discussed briefly in consideration of the roles of inorganic additive Al(III) in the precursor solution and structural defects in the growth process. Findings of this research will help to develop a strategy that is capable of producing micro/nanostructures with desired geometric features and functional properties.

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Section: Resultsmentioning

confidence: 96%

Renucleation and Sequential Growth of ZnO Complex Nano/Microstructure: From Nano/Microrod to Ball-Shaped Cluster

Yan

Zou

et al. 2010

J. Phys. Chem. C

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“…Before CL measurements the nanorod SQWs were detached from the Si substrate and dispersed on a Si substrate. Measurements were performed at 5 K with a CL spectroscopy attached to an electron microscopy chamber, as described elsewhere 27. The electron beam acceleration voltage and current were 30 kV and 100 pA, respectively, when the electron beam diameter was estimated to be 50 nm.…”

Section: Methodsmentioning

confidence: 99%

Probing Exciton Diffusion in Semiconductors Using Semiconductor‐Nanorod Quantum Structures

Yoo

Dang

2008

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“…[23][24][25][26][27][28] The UV peak observed in this study can be ascribed to the near band edge emission (NBE: 385 nm), and the visible peak is ascribed to the deep level emissions (DE: 550 nm). Chang et al found that stoichiometry is the key to strong CL emission near the band edge (382 nm), while a high oxygen-vacancy concentration leads to strong green emission around 550 nm.…”

Section: Spatially Resolved Cathodoluminescence From Individual Nanobmentioning

confidence: 99%

“…[27a] Another study by Dang and co-workers indicated that large lattice defects at the bottom of nanowires, grown on a substrate, leads to variation in CL transitions. [28] Thus, the UV peak in the present sample is the NBE peak whereas the visible emission may be caused by oxygen vacancies.…”

Section: Spatially Resolved Cathodoluminescence From Individual Nanobmentioning

confidence: 99%

Solvothermal Synthesis, Cathodoluminescence, and Field‐Emission Properties of Pure and N‐Doped ZnO Nanobullets

Gautam

Panchakarla

Dierre

et al. 2008

Adv Funct Materials

153

100

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Homogenous crystallization in solution, in the absence of external influences, is expected to lead to growth that is symmetric at least in two opposite facets. Such was not the case when we attempted to synthesize ZnO nanostructures by employing a solvothermal technique. The reaction product, instead, consisted of bullet‐shaped tiny single crystals with an abrupt hexagonal base and a sharp tip. A careful analysis of the product and the intermediate states of the synthesis reveals that one of the reaction intermediates with sheet‐like morphology acts as a self‐sacrificing template and induces such unexpected and novel growth. The synthesis was further extended to dope the nanobullets with nitrogen as previous studies showed this can induce p‐type behavior in ZnO, which is technologically complementary to the naturally occurring n‐type ZnO. Herein, a soft‐chemical approach is used for the first time for this purpose, which is otherwise accomplished with high‐temperature techniques. Cathodoluminesce (CL) investigations reveal stable optical behavior within a pure nanobullet. On the other hand, the CL spectra derived from the surfaces and the cores of the doped samples are different, pointing at a N‐rich core. Finally, even though N‐doped ZnO is known to have high electrical conductivity, the study now demonstrates that the field‐emission properties of ZnO can also be greatly enhanced by means of N doping.

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Cathodoluminescence of single ZnO nanorod heterostructures

Cited by 16 publications

References 5 publications

Renucleation and Sequential Growth of ZnO Complex Nano/Microstructure: From Nano/Microrod to Ball-Shaped Cluster

Renucleation and Sequential Growth of ZnO Complex Nano/Microstructure: From Nano/Microrod to Ball-Shaped Cluster

Probing Exciton Diffusion in Semiconductors Using Semiconductor‐Nanorod Quantum Structures

Solvothermal Synthesis, Cathodoluminescence, and Field‐Emission Properties of Pure and N‐Doped ZnO Nanobullets

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