The effect of seed layer thickness on alignment and morphology of ZnO nanorods

Ghayour, Hamid; Rezaie, Hamid Reza; Mirdamadi, Sh.; Nourbakhsh, Amir Abbas

doi:10.1016/j.vacuum.2011.04.025

Cited by 102 publications

(61 citation statements)

References 25 publications

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“…The seed layer, which consists of zinc oxide crystallites preformed or spin-coated on the substrate,[25][26][27] promotes the heterogeneous nucleation on the substrate (while the homogenous one typically occurs in the bulk solution). The fact that the anisotropic growth of these nanostructures is intrinsic to wet chemical methods and to wurtzite structure has found several experimental evidences 28,29.…”

mentioning

confidence: 99%

Double Role of HMTA in ZnO Nanorods Grown by Chemical Bath Deposition

Strano¹,

Urso²,

Scuderi

et al. 2014

J. Phys. Chem. C

151

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ZnO nanorods (NRs) grown by chemical bath deposition (CBD) are among the most promising semiconducting nanostructures currently investigated for a variety of applications. Still, contrasting experimental results appear in literature on the microscopic mechanisms leading to high aspect-ratio and vertically aligned ZnO NRs. Here, we report on CBD of ZnO NRs by using Zn nitrate salt and hexamethylenetetramine (HMTA), evidencing a double role of HMTA in the NRs growth mechanism. Beyond the well-established pH buffering activity, HMTA is shown to introduce a strong steric hindrance effect biasing the growth along the c-axis and ensuring the vertical arrangement. This twofold function of HMTA should be taken into account for avoiding detrimental phenomena such as merging or suppression of NRs, which occur at low HMTA concentration.

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mentioning

confidence: 99%

Double Role of HMTA in ZnO Nanorods Grown by Chemical Bath Deposition

Strano¹,

Urso²,

Scuderi

et al. 2014

J. Phys. Chem. C

151

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“…Such a nding accords with previous reports that the density and size of the nuclei comprising the seed layer have a marked inuence on the array density and the NR diameters. 17,19,21 However, Table 1 also shows that growth on the seed layer annealed in Ar results in a similar density of NRs that, on average, are slightly longer and thicker than when using an unprocessed seed layer -hinting that the array density is not necessarily correlated with the NR heights and diameters. Table 1 also highlights that the NR lengths (i.e.…”

Section: The Nanorodsmentioning

confidence: 99%

“…14,15 Another widely used strategy is to grow on a predeposited seed layer; the density, size and arrangement of the seeds are found to inuence the density, diameters and distribution of the resulting NR array. [16][17][18][19][20][21][22][23][24] A detailed understanding of the correlation between the seed layer characteristics and the growth rate, light emission properties, etc. of the resulting ZnO NRs remains elusive, however.…”

Section: Introductionmentioning

confidence: 99%

Controlling the hydrothermal growth and the properties of ZnO nanorod arrays by pre-treating the seed layer

Yin

Sun

et al. 2014

RSC Adv.

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Dense arrays of ultra-thin zinc oxide (ZnO) nanorods have been fabricated on c-oriented ZnO seed layers by hydrothermal growth, with particular emphasis on exploring the effects of annealing or plasma pre-treating the seed layer. Such pre-treatments influence the density, size and surface defects of particles within the nucleating seed layer, which impacts on the subsequent nanorod growth via sequential reaction with OH À and Zn 2+ species. Oxygen-rich defects at the seed layer surface are deduced to have particular impact -affecting both the c-axis growth rate and the photoluminescence properties of the as-grown nanorods.

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“…Above this range no further increase was found. Meanwhile, Ghayour, et al [7] showed the effect of a sputtered seed layer on the crystal structure, grain size and surface roughness of ZnO nanorods. They found that the crystallinity, grain size, diameter and alignment of the nanorods improved as the thickness of the seed layer was increased, while the roughness decreased.…”

Section: Introductionmentioning

confidence: 99%

Influence of Various Precursor Compositions and Substrate Angles on ZnO Nanorod Morphology Growth by Aqueous Solution Method

et al. 2016

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Abstract. ZnO nanorods were synthesized on silicon wafer substrate with a seed zinc layer using the aqueous solution method. The influence of various precursor compositions on the morphology of the ZnO nanorods, with substrate angles at 0 and 90, was investigated. The various ratios of hexamethylenetetramine in zinc nitrate hexahydrate were used as precursors in the synthesis of ZnO. Scanning electron micrography indicated that the growth of the ZnO nanorods with a 0 substrate angle was smaller than with a 90 substrate angle. The substrate angle is defined as the angle between the plane of the substrate and the horizontal layer of an aqueous solution. When the precursor concentration of hexamethylenetetramine is not equal to the ratio corresponding to the chemical reaction, the effect of the substrate angle on the diameter size and morphology of the ZnO nanorods is evident. Grazing incident X-ray diffraction (GIXRD) was used to characterize the structure of all samples. The diffraction patterns showed that the orientation matched the hexagonal wurtzite structure.

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The effect of seed layer thickness on alignment and morphology of ZnO nanorods

Cited by 102 publications

References 25 publications

Double Role of HMTA in ZnO Nanorods Grown by Chemical Bath Deposition

Double Role of HMTA in ZnO Nanorods Grown by Chemical Bath Deposition

Controlling the hydrothermal growth and the properties of ZnO nanorod arrays by pre-treating the seed layer

Influence of Various Precursor Compositions and Substrate Angles on ZnO Nanorod Morphology Growth by Aqueous Solution Method

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