Morphology transitions in ZnO nanorods grown by MOCVD

Montenegro, D N; Souissi, A.; Martı́nez-Tomás, C.; Muñoz‐Sanjosé, V.; Sallet, Vincent

doi:10.1016/j.jcrysgro.2012.08.038

Cited by 47 publications

(39 citation statements)

References 36 publications

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“…Morphological characteristics and details of growth mechanisms of this type of samples can be found in our previous work. 20 The growth time for nanorods grown on a buffer layer on c-sapphire was varied from 10 to 40 min, while for nanorods grown on bare substrates it was varied from 5 to 15 min. All the ZnO nanorods were synthesized at 800 C.…”

Section: Methodsmentioning

confidence: 99%

“…Nevertheless, increasing further the VI/II ratio leads to an evolution of the nanowires morphology towards 2D films. 20 Moreover, the panchromatic CL images of the nanorods show that the nanorod bottom luminescence is bright and is progressively quenched when approaching the nanorod tip, Figure 5(a). This image reveals a strong change of the internal quantum efficiency along the nanorod.…”

Section: Characterizationmentioning

confidence: 99%

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Influence of metal organic chemical vapour deposition growth conditions on vibrational and luminescent properties of ZnO nanorods

Montenegro

Hortelano

Martı́nez

et al. 2013

Journal of Applied Physics

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A detailed optical characterization by means of micro Raman and cathodoluminescence spectroscopy of catalyst-free ZnO nanorods grown by atmospheric-metal organic chemical vapour deposition has been carried out. This characterization has allowed correlating the growth conditions, in particular the precursors partial-pressures and growth time, with the optical properties of nanorods. It has been shown that a high Zn supersaturation can favor the incorporation of nonradiative recombination centers, which can tentatively be associated with Zn I -related defects. Characterization of individual nanorods has evidenced that Zn I -related defects have a tendency to accumulate in the tip part of the nanorods, which present dark cathodoluminescence contrast with respect to the nanorods bottom. The effect of a ZnO buffer layer on the properties of the nanorods has been also investigated, showing that the buffer layer improves the luminescence efficiency of the ZnO nanorods, revealing a significant reduction of the concentration of nonradiative recombination centers. V C 2013 AIP Publishing LLC [http://dx.

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Section: Methodsmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Influence of metal organic chemical vapour deposition growth conditions on vibrational and luminescent properties of ZnO nanorods

Montenegro

Hortelano

Martı́nez

et al. 2013

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

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“…[1][2][3][4][5][6][7][8]. Among them, ZnO, as an important II-VI semiconductor with a direct band gap of 3.37 eV, larger exciton binding energy of 60 mV [9,10] at room temperature, and piezoelectricity [11], has attracted special interest. Especially, vertically aligned ZnO nanorod arrays (ZNAs), due to their non-toxicity, low-cost, large surface to volume ratio, and ease of large scale fabrication, can be employed in many devices, like solar cells, UV lasers, gas sensors, UV detectors, and photocatalysis [12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Especially, vertically aligned ZnO nanorod arrays (ZNAs), due to their non-toxicity, low-cost, large surface to volume ratio, and ease of large scale fabrication, can be employed in many devices, like solar cells, UV lasers, gas sensors, UV detectors, and photocatalysis [12][13][14][15][16][17][18][19][20]. Various methods have been used to synthesize ZNAs, including chemical vapor deposition (CVD) [21,22], pulsed laser deposition (PLD) [23], molecular beam epitaxy (MBE) [10,24], etc. Compared to these methods, the aqueous solution method [25,26] has emerged more recently, which paves a facile way to obtain preferred-aligned ZNAs on various substrates just by pre-coating a ZnO seed layer.…”

Section: Introductionmentioning

confidence: 99%

Morphology Transition of ZnO Nanorod Arrays Synthesized by a Two-Step Aqueous Solution Method

Huang

Lin

et al. 2018

Crystals

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ZnO nanorod arrays (ZNAs) with vertically-aligned orientation were obtained by a two-step aqueous solution method. The morphology of the ZnO nanorods was regulated by changing the precursor concentration and the growth time of each step. ZnO nanorods with distinct structures, including flat top, cone top, syringe shape, and nail shape, were obtained. Moreover, based on the X-ray diffraction (XRD) and the transmission electron microscope (TEM) analysis, the possible growth mechanisms of different ZnO nanostructrues were proposed. The room-temperature PL spectra show that the syringe-shaped ZNAs with ultra-sharp tips have high crystalline quality. Our study provides a simple and repeatable method to regulate the morphology of the ZNAs.

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“…Vapor-phase synthesis methods include vapor-solid growth (VS), 4 catalytic vapor-liquid-solid 5 (VLS), chemical vapor deposition (CVD), 6 thermal evaporation, 7 thermal decomposition 8 and catalyst-free metal-organic chemical vapor deposition (MOCVD). 9 These methods produce high quality single crystal ZnO nanostructures, but require expensive equipment setup, monocrystalline substrates and high growth temperature (more than 700 C), limiting the scale-up for large-scale fabrication. Comparatively, liquidphase methods as hydrothermal synthesis is an attractive alternative because it could be carried out at a relatively low processing temperature bellow 100 C, is highly versatile with a high composition control, 10 allows the use of polycrystalline and even amorphous substrates 11 and requires simple and inexpensive equipments.…”

Section: Introductionmentioning

confidence: 99%

Uniform Arrays of ZnO 1D Nanostructures Grown on Al:ZnO Seeds Layers by Hydrothermal Method

Danciu¹,

Muşat²,

Busani³

et al. 2013

j. nanosci. nanotech.

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In obtaining uniform array of ZnO 1D nanostructures, especially using solution based methods, the thickness and the morphology of the epitaxial seeds layer are very important. The paper presents the effect of the thickness and the morphology of the Al:ZnO seeds layer on the morphology and properties of ZnO nanowires array grown by hydrothermal method. Compact and vertically aligned ZnO 1D nanostructures were obtained. Concentration of 0.02 M of zinc nitrate was found to be optimal for growing nanowires with diameters up to 50 nm and lengths between 1.5 and 2.5 microns. Using 0.04 M solution, nanorods with diameter between 50 and 100 nm were obtained. The correlation between the crystal structure and optical properties of ZnO nanowires is discussed. From electrical measurements on single nanowire, resistivity value of 9 x 10(-2) omega cm was obtained. The I-V curves of single ZnO NWs show quasi diode characteristic when an e-beam is irradiating the NWs, and a typical semiconductive behaviour when the e-beam is turned off.

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Morphology transitions in ZnO nanorods grown by MOCVD

Cited by 47 publications

References 36 publications

Influence of metal organic chemical vapour deposition growth conditions on vibrational and luminescent properties of ZnO nanorods

Influence of metal organic chemical vapour deposition growth conditions on vibrational and luminescent properties of ZnO nanorods

Morphology Transition of ZnO Nanorod Arrays Synthesized by a Two-Step Aqueous Solution Method

Uniform Arrays of ZnO 1D Nanostructures Grown on Al:ZnO Seeds Layers by Hydrothermal Method

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