Low temperature synthesis and characterization of MgO/ZnO composite nanowire arrays

Shimpi, Paresh; Gao, Pu‐Xian; Goberman, Daniel; Ding, Y.

doi:10.1088/0957-4484/20/12/125608

Cited by 68 publications

(43 citation statements)

References 29 publications

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“…This technique was reported to increase the emission intensity by a few times due to the quantum confi nement effect of the photogenerated carriers in the ZnO cores. [7][8][9][10] In the present paper, we report that sheathing well-faceted MgO nanorods with a semiconductor fi lm with an optimal thickness resulted in ultraintense luminescence characteristic of the sheath material and its origin is discussed. The intensity of the blue-green emission from the MgO-core/TiO 2 -shell nanostructures with a specifi c shell layer thickness ( ≈ 20 nm) was ≈ 220 times higher than that of the original orange emission from the MgO nanorods.…”

mentioning

confidence: 74%

“…[ 2 , 3 ] The luminescence property of 1D nanostructures can be further enhanced by creating core/shell heterostructures. [4][5][6] Ultraviolet photoluminescence (PL) enhancement by sheathing ZnO 1D nanostructures with a larger bandgap material such as ZnS, [ 7 ] SnO 2 , [ 8 ] MgO, [ 9 ] or Al 2 O 3 [ 10 ] has recently been demonstrated. This technique was reported to increase the emission intensity by a few times due to the quantum confi nement effect of the photogenerated carriers in the ZnO cores.…”

Section: Doi: 101002/adma201004266mentioning

confidence: 99%

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Ultraintense Luminescence in Semiconducting‐Material‐Sheathed MgO Nanorods

et al. 2011

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One-dimensional (1D) nanostructures, such as nanowires, nanorods, nanobelts, nanoribbons, nanoneedles, and nanotubes, have attracted considerable attention due to their unique and fascinating properties as well as their potential technological applications. [ 1 ] In particular, 1D nanostructures are emerging as powerful building blocks for nanoscale photonic devices such as light-emitting diodes, photodiodes, lasers, active waveguides, and integrated electro-optic modulator structures because of their higher luminescence effi ciency. [ 2 , 3 ] The luminescence property of 1D nanostructures can be further enhanced by creating core/shell heterostructures. [4][5][6] Ultraviolet photoluminescence (PL) enhancement by sheathing ZnO 1D nanostructures with a larger bandgap material such as ZnS, [ 7 ] SnO 2 , [ 8 ] MgO, [ 9 ] or Al 2 O 3[ 10 ] has recently been demonstrated. This technique was reported to increase the emission intensity by a few times due to the quantum confi nement effect of the photogenerated carriers in the ZnO cores. [7][8][9][10] In the present paper, we report that sheathing well-faceted MgO nanorods with a semiconductor fi lm with an optimal thickness resulted in ultraintense luminescence characteristic of the sheath material and its origin is discussed. The intensity of the blue-green emission from the MgO-core/TiO 2 -shell nanostructures with a specifi c shell layer thickness ( ≈ 20 nm) was ≈ 220 times higher than that of the original orange emission from the MgO nanorods. In addition, we discuss the requirements and design of the MgO-core/ semiconductor-shell nanorod system for ultraintense luminescence in other wavelength ranges. Figure 1 a shows the scanning electron microscopy (SEM) images of the MgO-core/TiO 2 -shell nanorods synthesized by the thermal evaporation of Mg 3 N 2 powders at 900 ° C for 1 h in an oxidative atmosphere and the metal organic chemical vapor deposition (MOCVD) of TiO 2 at 350 ° C for 2 h. Recently, MgO 1D nanostructures were synthesized successfully using a range of techniques including sol-gel process; [ 11 ] thermal evaporation of MgO, [ 12 ] MgB 2 , [ 13 ] or Mg 3 N 2 powders; [ 14 ] and pulsed laser deposition. [ 15 ] Of these techniques, the MgO 1D nanostructures with facetted surfaces are known to be grown most easily by the thermal evaporation of Mg 3 N 2 powders. Statistical analysis of many SEM images of the core/shell nanorods revealed widths ranging from 60 to 180 nm and lengths ranging from 3 to 5 μ m. The SEM image in Figure 1 b clearly displays the geometrical confi guration of a typical core/shell nanorod with a square cross-section and faceted surfaces. The enlarged SEM image of a typical core/shell nanorod (inset in Figure 1 b) showed that a globular particle did exist at the tip of the nanorod, suggesting that the nanorods were grown via a vapor-liquid-solid mechanism. Five elements including Mg, Ti, O, Cu, and C were detected in the energy dispersive X-ray (EDX) spectra (Figure 1 c) of these core/shell nanorods. Of these elements, Mg, Ti, and O wer...

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confidence: 74%

Section: Doi: 101002/adma201004266mentioning

confidence: 99%

Ultraintense Luminescence in Semiconducting‐Material‐Sheathed MgO Nanorods

et al. 2011

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“…In their method, common ZnO nanowire arrays were immersed into an aqueous solution of Zn(NO 3 ) 2 ·6H 2 O, HMTA, and Mg(NO 3 ) 2 ·6H 2 O in a 1 : 1 : 2 ratio, at a growth temperature of 155 °C for 4 h. In the photoluminescence spectra, ZnO:MgO nanowires showed a blue-shifted near-band-edge UV emission at both room temperature and low temperature, relative to the pristine ZnO nanowires [265].…”

Section: Alloyingmentioning

confidence: 99%

One-dimensional ZnO nanostructures: Solution growth and functional properties

2011

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One-dimensional (1D) ZnO nanostructures have been studied intensively and extensively over the last decade not only for their remarkable chemical and physical properties, but also for their current and future diverse technological applications. This article gives a comprehensive overview of the progress that has been made within the context of 1D ZnO nanostructures synthesized via wet chemical methods. We will cover the synthetic methodologies and corresponding growth mechanisms, different structures, doping and alloying, positioncontrolled growth on substrates, and finally, their functional properties as catalysts, hydrophobic surfaces, sensors, and in nanoelectronic, optical, optoelectronic, and energy harvesting devices.

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“…16 Of these techniques, formation of core-shell nanostructures by encapsulating ZnO nanostructures with other semiconducting oxide thin films has been reported by many research groups. [17][18][19][20][21][22][23][24][25][26] Recently, we reported that ultraintense shortwavelength emission could be obtained from ZnO-sheathed MgO nanorods induced by subwavelength optical resonance cavity formation. 27 This technique differs from previous encapsulation techniques in that the core and shell materials were MgO and ZnO, respectively.…”

Section: -12mentioning

confidence: 99%

Photoluminescence in MgO-ZnO Nanorods Enhanced by Hydrogen Plasma Treatment

Park¹,

Ko²,

Mun³

et al. 2013

Bulletin of the Korean Chemical Society

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MgO nanorods were fabricated by the thermal evaporation of Mg3N2. The influence of ZnO sheathing and hydrogen plasma exposure on the photoluminescence (PL) of the MgO nanorods was studied. PL measurements of the ZnO-sheathed MgO nanorods showed two main emission bands: the near band edge emission band centered at ~380 nm and the deep level emission band centered at ~590 nm both of which are characteristic of ZnO. The near band edge emission from the ZnO-sheathed MgO nanorods was enhanced with increasing the ZnO shell layer thickness. The near band edge emission from the ZnO-sheathed MgO nanorods appeared to be enhanced further by hydrogen plasma irradiation. The underlying mechanisms for the enhancement of the NBE emission from the MgO nanorods by ZnO sheathing and hydrogen plasma exposure are discussed.

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Low temperature synthesis and characterization of MgO/ZnO composite nanowire arrays

Cited by 68 publications

References 29 publications

Ultraintense Luminescence in Semiconducting‐Material‐Sheathed MgO Nanorods

Ultraintense Luminescence in Semiconducting‐Material‐Sheathed MgO Nanorods

One-dimensional ZnO nanostructures: Solution growth and functional properties

Photoluminescence in MgO-ZnO Nanorods Enhanced by Hydrogen Plasma Treatment

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