A catalyst-free and facile route to periodically ordered and c-axis aligned ZnO nanorod arrays on diverse substrates

Byrne, Daragh; McGlynn, Enda; Cullen, Joseph; Henry, M.O.

doi:10.1039/c0nr00919a

Cited by 25 publications

(26 citation statements)

References 44 publications

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“…[36] Note that the PL emission is associated with the VPTgrown nanorods and there is not a significant emission from the underlying buffer layer. [37] Figure 5(c) shows the green band emission region for 66 ZnO. This was recorded using a portion of the 66 ZnO sample which was annealed for ten minutes at 900 °C to increase the ZPL and green band intensity.…”

Section: Resultsmentioning

confidence: 99%

Growth of isotopically enriched ZnO nanorods of excellent optical quality

Gray

Cullen

Byrne

et al. 2015

Journal of Crystal Growth

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We have produced isotopically enriched ZnO nanorods using Zn-enriched ZnO source powder by vapour phase transport on silicon substrates buffer-coated with unenriched ZnO seed layers. SEM and XRD data confirm successful growth of high quality, dense, c-axis aligned nanorods over a substantial surface area. Raman data show a shift of >1 cm -1 in the peak position of the Raman scattered peaks due to the E 2 low and E 2 high phonon modes when the Zn isotope is changed from 64 Zn to 68 Zn, consistent with previous work, thus confirming successful isotopic enrichment. SIMS data provides additional confirmation of enrichment.The optical quality (as determined by photoluminescence feature intensity and linewidth) is excellent. Samples with Zn isotopic enrichment ranging from 64 ZnO to 68 ZnO display a shift in recombination energy of the bound excitons at the band edge (3.34 -3.37 eV) of ~ 0.6 meV. This blue shift is also consistent with previously published data, further confirming *Manuscript Revised Click here to view linked References 2 both the excellent optical quality and successful isotopic substitution of ZnO nanorods using this relatively simple growth method.

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Section: Resultsmentioning

confidence: 99%

Growth of isotopically enriched ZnO nanorods of excellent optical quality

Gray

Cullen

Byrne

et al. 2015

Journal of Crystal Growth

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“…In general, VPT nanowire arrays tend to have large variations of nanowire height, even between adjacent nanowires, however this is reduced in the case of arrays produced using an NSL silica mask [19]. …”

Section: Resultsmentioning

confidence: 99%

“…Silicon substrates with (100) orientation were coated with a ZnO buffer layer using a method combining drop coating and CBD [18,19] to provide suitable nucleation sires for ZnO nanowire growth and to ensure that such growth is c-axis aligned.…”

Section: Sample Preparationmentioning

confidence: 99%

Influence of ZnO nanowire array morphology on field emission characteristics

Garry¹,

McCarthy²,

Mosnier³

et al. 2014

Nanotechnology

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In this work the growth and field emission properties of vertically aligned and spatially ordered and unordered ZnO nanowires are studied. Spatially ordered nanowire arrays of controlled array density are synthesised by both chemical bath deposition and vapour phase transport using an inverse nanosphere lithography technique, while spatially unordered arrays are synthesised by vapour phase transport without lithography. The field emission characteristics of arrays with 0.5 µm, 1.0 µm, and 1.5 µm inter-wire distances, as well as unordered arrays, are examined, revealing that with the range of values examined field emission properties are mainly determined by variations in nanowire height, and show no correlation with nanowire array density. Related to this, we find that a significant variation in nanowire height in an array also leads to a reduction in catastrophic damage observed on samples during field emission because arrays with highly uniform heights are found to suffer significant arcing damage. We discuss these results in light of recent computational studies of comparable nanostructure arrays and find strong qualitative agreement between our results and the computational predictions. Hence the results presented in this work should be useful in informing the design of ZnO nanowire arrays in order to optimise their field emission characteristics generally.

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“…This boat was then loaded into the furnace for the nanorod growth. Further details concerning the growth process are reported elsewhere [5,6,15].…”

Section: Vpt Nanorod Growthmentioning

confidence: 99%

“…Many deposition techniques including vapour phase transport (VPT) [5][6][7][8][9], metal-organic chemical vapour deposition (MOCVD) [1,10], hydrothermal deposition [11], pulsed laser deposition (PLD) [12], electrochemical deposition [13], and chemical bath deposition (CBD) [14] have been used to grow vertically aligned ZnO nanorods with good crystalline quality and optical properties.…”

Section: Introductionmentioning

confidence: 99%

Origin of the 3.331 eV emission in ZnO nanorods: Comparison of vapour phase transport and pulsed laser deposition grown nanorods

Inguva

Gray

McGlynn

et al. 2016

Journal of Luminescence

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*Corresponding authors: saikumar.inguva2@mail.dcu.ie and enda.mcglynn@dcu.ie. KEYWORDSZnO seed layers, vertically aligned ZnO nanorods, vapour phase transport, pulsed laser deposition, 3.331 eV emission. 2 ABSTRACTIn this work, we report the growth of vertically aligned ZnO nanorods with excellent optical quality by both catalyst free vapor phase transport (VPT) and catalyst free pulsed laser deposition (PLD). We compare the near band edge emission of such deposits, with a focus on the identification of the origin of the 3.331 eV emission feature. X-ray diffraction (XRD), scanning electron microscopy (SEM) and low-temperature (13 K) photoluminescence (PL) were used to characterise these nanorod deposits. XRD and SEM data reveal that both techniques lead to highly textured ZnO nanorod arrays with uniform c-axis orientation normal to the substrate surface. The VPT-grown nanorods are well separated and show smooth, facetted surfaces whereas the PLD-grown nanorods are more closely packed and display comparatively rougher surfaces. The optical quality of the samples obtained by both growth methods was very good and low-temperature PL spectra were dominated in both cases by a strong I 6 bound exciton (BX) emission (3.36 eV), and also showed emission from the surface exciton and the free exciton. A comparatively weak visible emission was also observed in samples deposited by both techniques.The main difference between the PLD-and VPT-grown nanorod samples is the presence of the 3.331 eV emission in the former, and its complete absence in the latter (as well as in continuous PLD-grown seed layers) which is discussed in light of the differing surface morphologies mentioned above and which provides strong support for our previous assignment of the origin of this defect to structural defects in the inhomogeneous sub-surface region close to the rough nanorod surface.3

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A catalyst-free and facile route to periodically ordered and c-axis aligned ZnO nanorod arrays on diverse substrates

Cited by 25 publications

References 44 publications

Growth of isotopically enriched ZnO nanorods of excellent optical quality

Growth of isotopically enriched ZnO nanorods of excellent optical quality

Influence of ZnO nanowire array morphology on field emission characteristics

Origin of the 3.331 eV emission in ZnO nanorods: Comparison of vapour phase transport and pulsed laser deposition grown nanorods

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