Structural and Optical Properties of ZnO Nanotips Grown on GaN Using Metalorganic Chemical Vapor Deposition

Zhong, Jiaming; Saraf, Gaurav; Chen, H.; Lu, Yicheng; Ng, H. M.; Siegrist, T.; Parekh, A.; Lee, D.; Armour, E.

doi:10.1007/s11664-007-0130-8

Cited by 8 publications

(8 citation statements)

References 20 publications

(14 reference statements)

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“…At the temperature of 200 K, the free exciton emission dominates the NBE luminescence, whereas the bound exciton emission becomes hardly resolvable, indicating that the decomposition of bound excitons to free ones has almost completed. The quenching temperature of this emission is lower than that for bulk ZnO crystals at 210 K but is higher than that reported by Zhong et al for ZnO nanotips grown on GaN using metalorganic chemical vapor deposition . The transition from the bound exciton emission dominating luminescence to the free exciton dominating one obviously indicates that the dominant room-temperature NBE luminescence results from radiative recombination of free excitons.…”

Section: Resultsmentioning

confidence: 52%

“…The quenching temperature of this emission is lower than that for bulk ZnO crystals at 210 K 9 but is higher than that reported by Zhong et al for ZnO nanotips grown on GaN using metalorganic chemical vapor deposition. 30 The transition from the bound exciton emission dominating luminescence to the free exciton dominating one obviously indicates that the dominant room-temperature NBE luminescence results from radiative recombination of free excitons.…”

Section: Resultsmentioning

confidence: 99%

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Photoluminescence and Lasing Properties of Catalyst-Free ZnO Nanorod Arrays Fabricated by Pulsed Laser Deposition

Gao

et al. 2012

J. Phys. Chem. C

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Nearly oriented ZnO nanorods with a mean diameter of ∼200 nm and length of 0.8 to 1.7 μm were prepared directly on lattice-mismatched Si (100) substrate by pulsed laser deposition without catalysts. In correlation with the detailed characterization of the morphology, crystalline structure, and oxide phases of the prepared ZnO nanorod arrays, the photoluminescence and lasing properties were studied. At room temperature, the ZnO nanorods emit strong near band edge emission resulting from radiative recombination of free excitons generated by ultraviolet light excitation. The random-lasing-like stimulated emission is observed at high optical pumping at room temperature, which centers around 382.8 nm and results from the superposition of guided lasing modes in different nanorods. The individual peaks as well as the stimulated emission as a whole show red shifts as the pumping intensity increases.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 99%

Photoluminescence and Lasing Properties of Catalyst-Free ZnO Nanorod Arrays Fabricated by Pulsed Laser Deposition

Gao

et al. 2012

J. Phys. Chem. C

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“…Lu and co-workers have developed epitaxial Mg x Zn 1 - x O films by alloying ZnO with MgO 6c,6e and observed that it is more resistant to acids. Mg x Zn 1 - x O nanotip films (termed MgZnO−N in this paper) were therefore developed for this work, because they would allow us to employ a wider pH range. The percentage of MgO in alloyed ZnO was varied in the 5−10% range.…”

Section: Resultsmentioning

confidence: 99%

Binding Studies of Molecular Linkers to ZnO and MgZnO Nanotip Films

et al. 2006

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Two bifunctional linkers, a rigid-rod p-ethynyl-isophthalic acid capped with a Ru(II)-polypyridyl complex and 3-mercaptopropionic acid, were covalently bound to ZnO nanotip films grown by metal-organic chemical vapor deposition (MOCVD) technology. This highly vertically aligned, crystalline form of ZnO had not been functionalized before. The binding was studied by Fourier transform (FT) IR and UV spectroscopies and probed, in the case of the Ru complex, by static and dynamic fluorescence quenching. The molecules did bind through the carboxylic acid groups, and the FT-IR attenuated total reflectance spectra are indicative of a bidentate carboxylate binding mode. Other molecules (heptanoic acid, isophthalic acid, and trimethoxy(2-phenylethyl)silane) were also bound to the ZnO nanotips. A comparison was made with epitaxial ZnO films grown by MOCVD and ZnO mesoporous films prepared from colloidal solutions to investigate the effect of the ZnO morphology. The ZnO nanotips were excellent binding substrates, particularly for the rigid-rod linker. Since ZnO films are etched at low pH (< 4), novel nanotip films made of ternary MgxZn1-xO, which is formed by alloying ZnO with MgO and is more resistant to acids, were developed. The MgxZn1-xO nanotip films were employed to use linkers with acidic groups and to study the effect of pH pretreatment of the surface on the binding.

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“…The ZnO NBE emission turns out to be dominated by the component related to free excitons above 200 K, as shown in Figures 5 and 6. The evolution of the ZnO NBE emission reveals the decomposition of bound excitons to free ones with the increase of the thermal energy and the release of excitons from donors 26,44 and indicates that the decomposition of bound excitons to free ones has almost completed above 200 K. The temperature-dependent ZnO NBE emission and the…”

Section: Resultsmentioning

confidence: 93%

“…The ZnO NBE emission turns out to be dominated by the component related to free excitons above 200 K, as shown in Figures and . The evolution of the ZnO NBE emission reveals the decomposition of bound excitons to free ones with the increase of the thermal energy and the release of excitons from donors , and indicates that the decomposition of bound excitons to free ones has almost completed above 200 K. The temperature-dependent ZnO NBE emission and the transition from the bound exciton dominating ZnO NBE emission to the free exciton dominating one obviously reveal that the dominant room-temperature ZnO NBE emission results from the radiative recombination of free excitons whether for the bare ZnO NR arrays or for the Ti-covered ZnO NR arrays.…”

Section: Results and Discussionmentioning

confidence: 96%

Large Enhancement and Its Mechanism of Ultraviolet Emission from ZnO Nanorod Arrays at Room and Low Temperatures by Covering with Ti Coatings

Yao

Gan³

et al. 2020

J. Phys. Chem. C

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ZnO has attracted considerable attention as an ultraviolet (UV) light emitting material. Many efforts have been made to promote efficiency for UV emission. We report large enhancement in UV emission from ZnO nanorod (NR) arrays by covering with Ti coatings. Together with morphology and structure characterization, the capability of UV emission from the Ti-coating-covered ZnO (Ti/ZnO) NR arrays was evaluated by systematically examining the photoluminescence at room and low temperatures. At room temperature, the bare ZnO NR arrays are capable of emitting a photoluminescence composed of a strong UV near-band-edge (NBE) emission of ZnO and a weak visible emission associated with deep-level defects in ZnO. The UV NBE emission is enhanced by about 24 times after covering the ZnO NR arrays with Ti coatings. The UV NBE emission increases drastically as the temperature drops, with the increase of the UV NBE emission of the Ti-covered ZnO NR arrays being much faster than that of the bare ZnO NR arrays. The UV NBE emission of the Ti/ZnO NR array is increased by about 175 times when the temperature drops from room temperature to 10 K. Compared to the UV NBE emission of the bare ZnO NR arrays, a 70-fold enhancement in the UV NBE emission of the Ti-covered ZnO NR arrays is obtained at 10 K.

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Structural and Optical Properties of ZnO Nanotips Grown on GaN Using Metalorganic Chemical Vapor Deposition

Cited by 8 publications

References 20 publications

Photoluminescence and Lasing Properties of Catalyst-Free ZnO Nanorod Arrays Fabricated by Pulsed Laser Deposition

Photoluminescence and Lasing Properties of Catalyst-Free ZnO Nanorod Arrays Fabricated by Pulsed Laser Deposition

Binding Studies of Molecular Linkers to ZnO and MgZnO Nanotip Films

Large Enhancement and Its Mechanism of Ultraviolet Emission from ZnO Nanorod Arrays at Room and Low Temperatures by Covering with Ti Coatings

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