Synthesis and characterization of aligned ZnO/MgO core–shell nanorod arrays on ITO substrate

Gao, Ming; Yang, Jing; Yang, Lili; Zhang, Y. J.; Liu, H. L.; Lang, Jihui; Sui, Yongming; Feng, Bo; Sun, Yunfei; Zhang, Z. Q.; Song, Hui

doi:10.1007/s00340-013-5436-z

Cited by 10 publications

(3 citation statements)

References 25 publications

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“…Our XPS results show that the surface oxygen vacancies are suppressed for the Co-doped sample, although the overall number of oxygen has been slightly reduced. A lower number of surface defects might be another reason for higher exciton emission, based on a report by Gao et al [220].…”

Section: Surface Chemistry Of Undoped and Cation-doped Zno Nanorodsmentioning

confidence: 93%

The effect of cation doping on the morphology, optical and structural properties of highly oriented wurtzite ZnO-nanorod arrays grown by a hydrothermal method

et al. 2017

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Undoped and C-doped (C: Mg, Ni, Mn, Co, Cu, Cr) ZnO nanorods were synthesized by a hydrothermal method at temperatures as low as 60 °C. The effect of doping on the morphology of the ZnO nanorods was visualized by taking their cross section and top SEM images. The results show that the size of nanorods was increased in both height and diameter by cation doping. The crystallinity change of the ZnO nanorods due to each doping element was thoroughly investigated by an x-ray diffraction (XRD). The XRD patterns show that the wurtzite crystal structure of ZnO nanorods was maintained after cation addition. The optical Raman-active modes of undoped and cation-doped nanorods were measured with a micro-Raman setup at room temperature. The surface chemistry of samples was investigated by x-ray photoelectron spectroscopy and energy-dispersive x-ray spectroscopy. Finally, the effect of each cation dopant on band-gap shift of the ZnO nanorods was investigated by a photoluminescence setup at room temperature. Although the amount of dopants (Mg, Ni, and Co) was smaller than the amount of Mn, Cu, and Cr in the nanorods, their effect on the band structure of the ZnO nanorods was profound. The highest band-gap shift was achieved for a Co-doped sample, and the best crystal orientation was for Mn-doped ZnO nanorods. Our results can be used as a comprehensive reference for engineering of the morphological, structural and optical properties of cation-doped ZnO nanorods by using a low-temperature synthesis as an economical mass-production approach.

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Section: Surface Chemistry Of Undoped and Cation-doped Zno Nanorodsmentioning

confidence: 93%

The effect of cation doping on the morphology, optical and structural properties of highly oriented wurtzite ZnO-nanorod arrays grown by a hydrothermal method

et al. 2017

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“…Nevertheless, the physical passivation mechanism that leads to the observed improvements of the UV photonic properties has remained elusive. Some authors have suggested that the MgO shell physically removes oxygen vacancies or other defects from the ZnO NW walls, thus eliminating recombination channels that compete with the excitonic recombination [12][13][14]. Others have suggested that the improved UV emission results from a dielectric screening effect provided by any dielectric shell [15].…”

Section: Introductionmentioning

confidence: 99%

The shell effect on the room temperature photoluminescence from ZnO/MgO core/shell nanowires: exciton–phonon coupling and strain

et al. 2017

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The room temperature photoluminescence from ZnO/MgO core/shell nanowires (NWs) grown by a simple two-step vapor transport method was studied for various MgO shell widths (w). Two distinct effects induced by the MgO shell were clearly identified. The first one, related to the ZnO/MgO interface formation, is evidenced by strong enhancements of the zero-phonon and first phonon replica of the excitonic emission, which are accompanied by a total suppression of its second phonon replica. This effect can be explained by the reduction of the band bending within the ZnO NW core that follows the removal of atmospheric adsorbates and associated surface traps during the MgO growth process on one hand, and a reduced exciton-phonon coupling as a result of the mechanical stabilization of the outermost ZnO NW monolayers by the MgO shell on the other hand. The second effect is the gradual increase of the excitonic emission and decrease in the defect related emission by up to two and one orders of magnitude, respectively, when w is increased in the ∼3-17 nm range. Uniaxial strain build-up within the ZnO NW core with increasing w, as detected by x-ray diffraction measurements, and photocarrier tunneling escape from the ZnO core through the MgO shell enabled by defect-states are proposed as possible mechanisms involved in this effect. These findings are expected to be of key significance for the efficient design and fabrication of ZnO/MgO NW heterostructures and devices.

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“…Many researchers have investigated the combined effect of these MgO-ZnO nanocomposites for several applications [15][16][17][18] . These MgO-ZnO nanocomposites find its use as a polycarboxylate dental cement 18 . The photocatalytic activity of ZnO was enhanced by the addition of highly hygroscopic and nanoporous MgO 19 .…”

mentioning

confidence: 99%

Effect of Temperature on Shape & Optical Properties of MgO/ZnO Nanocomposites

Selvi¹,

Rathnakumari²,

Priya³

et al. 2014

Asian J. Chem.

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Synthesis of nanocomposites in nanofield has drawn much attention due to their potential applications in nanoscale electronics and opto-electronic devices. The properties of nanocomposite materials depend not only on the properties of their individual parents but also on their morphology and interfacial characteristics. Thus, nanocomposites promise new applications in many fields such as mechanically reinforced lightweight components, non-linear optics, battery cathodes, nanowires, sensors and other systems 1-4. Metallic nanocomposites could offer distinct advantages over polymeric composites due to the inherent high temperature stability, high strength, high modulus, wear resistance and thermal and electrical conductivity of the metal matrix. Magnesium oxide (MgO) nanoparticle is thermodynamically stable and wide band gap (7.2 eV) material. It has application as a protective layer in plasma display panel 5 , paint, toxic waste water remediation, refractory materials, sensor and superconducting products 6-8. Magnesium oxide is a best candidate for the barrier material in super sensitive low field sensor called Magnetic Tunnel Junction (MTJ) sensors, because of its superior Tunneling magneto-resistance (TMR) value compared to AlOx 9,10. Zinc oxide is a wide bang gap (3.37 eV) semiconductor oxide and it is a promising material for electronic and opto electronic applications such as field emitters,

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Synthesis and characterization of aligned ZnO/MgO core–shell nanorod arrays on ITO substrate

Cited by 10 publications

References 25 publications

The effect of cation doping on the morphology, optical and structural properties of highly oriented wurtzite ZnO-nanorod arrays grown by a hydrothermal method

The effect of cation doping on the morphology, optical and structural properties of highly oriented wurtzite ZnO-nanorod arrays grown by a hydrothermal method

The shell effect on the room temperature photoluminescence from ZnO/MgO core/shell nanowires: exciton–phonon coupling and strain

Effect of Temperature on Shape & Optical Properties of MgO/ZnO Nanocomposites

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