Catalyst-free growth of uniform ZnO nanowire arrays on prepatterned substrate

Wang, Y. D.; Zang, K. Y.; Chua, Soo-Jin; Fonstad, Clifton G.

doi:10.1063/1.2425036

Cited by 26 publications

(16 citation statements)

References 32 publications

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“…The resonant Raman spectra of all the samples show multiphonon LO modes up to fourth order. It has been reported that the number of multiphonon scattering process observed in semiconductors varies monotonically with polaron coupling coefficient, and for ZnO with a large value of polaron coupling coefficient, LO phonons up to 10th order is expected [7]. The observation of multiphonon resonant Raman peaks in ZnO nanorods further justified the good optical quality of ZnO products.…”

Section: Resultsmentioning

confidence: 75%

“…3 and 4 show the visible micro-Raman and resonant Raman spectra of the nanorods grown under different conditions. The visible Raman spectra from the samples show phonon peaks of ZnO at 438 and 332 cm À1 , and are assigned as E 2 high and E 2 high -E 2 low modes of hexagonal ZnO, respectively [6][7][8][9]. The Raman peaks at 576.7, 418, and 379.5 cm À1 marked with asterisks in the spectra are the phonon modes appearing from the sapphire substrates.…”

Section: Resultsmentioning

confidence: 98%

“…However, for the realization of ZnO nanodevices, it is necessary to grow well-aligned nanorods on large area with good optical and structural properties. So far a lot of works have been reported on ZnO nanorods grown by various techniques such as metal organic chemical vapor deposition (MOCVD), atomic layer deposition (ALD), electrodeposition, thermal evaporation, and hydrothermal synthesis [1][2][3][4][5][6][7]. Among all, MOCVD has particular advantages such as accurate doping and large-area catalyst-free epitaxial growth.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural and optical properties of ZnO nanorods grown by metal organic chemical vapor deposition

Mohanta

Kim

Cho

et al. 2008

Journal of Crystal Growth

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Section: Resultsmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structural and optical properties of ZnO nanorods grown by metal organic chemical vapor deposition

Mohanta

Kim

Cho

et al. 2008

Journal of Crystal Growth

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“…And we also suggested that the nanopores of anodic aluminum oxide template may play an important role in controlling the local concentration which leads to an inhomogeneous concentration distribution and may affect the shape development. [14][15][16] But, as Figure 2b-d revealed, a transition layer has been clearly found and no changed with extending duration time, which was inconsistent with our foregone suggestion.…”

contrasting

confidence: 49%

Growth Mechanism of γ-MnS Nanorod-Arrays by Hydrothermal Method on Anodic Aluminum Oxide Template

Huang¹,

Liu²,

Lv³

et al. 2010

Bulletin of the Korean Chemical Society

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500 nm 500 nm 1 um 1 um 10 um 20 um Figure 1. (a) SEM image of anodic aluminum oxide template, inset cross-section image of anodic aluminum oxide template (b)-(e) SEM images of the products on different substrates respectively corresponding to anodic aluminum oxide template, one-step anodization Al foil, Al foil (dipped in HNO3 solution) and silicon wafer.MnS, as a p-type semiconductor with a wide gap (Eg = 3.7 eV), has a potential application in solar cell as a window/buffer, but also is linked with the study of diluted magnetic semiconductor (DMS).1 So far, a number of methods have been developed to fabricate different nanostructure MnS such as solvothermal method for preparing hierarchical architectures MnS, 2 biomolecule-assisted method for synthesizing porous MnS networks, 3 and chemical bath deposition method for making crystalline MnS thin film. 4 Hydrothermal method is a general, low-cost and convenience method which was utilized for synthesis of nanomaterials.5-7 Our research group has reported that oriented MnS nanorods on anodic aluminum oxide template were synthesized under a hydrothermal condition and demonstrated the effect of precursor content on the morphology evolution of assamples. 8 In order to research the growth mechanism of the arrays, herein we synthesized MnS nanorod arrays by combination of anodic aluminum oxide template and hydrothermal method on different substrates.Through-hole anodic aluminum oxide templates were prepared using Al foil (99.999%) via a two-step anodization process as described in literature.8 To investigate the effect of different substrates on the morphology of the-products, different substrates including anodic aluminum oxide template (sample A), one-step anodization Al foil (sample B, which was prepared by first anodizing Al foil for 10h and then removing the alumina layer with the mixed acid (0.6 M H 3 PO 4 and 0.15 M H 2 CrO 4 ), where the foil still kept the close-packed concave nano-pits consistently with the nanopole of anodic aluminum oxide template), Al foil (sample C, dipped in HNO 3 solution and covered by a compact alumina layer), Si wafer (sample D) respectively were put into Teflon-lined stainless steel autoclaves of 20 mL capacity filled with 16 mL mixed solution consisting of 2 mol/L MnCl4 and 2 mol/L thiourea. We kept the reaction at 150 o C for 20 h. When reactions completed the products were washed three times with distilled water and absolute ethanol, respectively. Then the products were dried in an oven at 60 o C. The powder XRD patterns (not showed here) reveal that the as-prepared products on different substrates were γ-MnS with lattice constants of a = 3.979 Å and c = 6.447 Å (JCPDS, No. 40-1289). And Figure 1 shows the typical SEM images of anodic aluminum oxide template and the as-prepared products on different substrates. b) -e) are respectively corresponding to on sample A ~ D. Figure 1a reveals that the anodic aluminum oxide template has highly ordered pores with a diameter of about 60 nm. The similar grass-like, packed nanorod arrays co...

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“…In order to avoid the problem, metal catalyst-free growth of the ZnO nanostructures has been also reported by MOCVD, etc. [9][10][11][12][13][14] Along with the growth of high quality nanostructures, in another point of view, the alignment and patterning of the nanostructures are also important issues in order to expand the potential applications into nano-device technology. Several methods have been extensively studied to architecturally control both the shape and the selective growth of the ZnO nanostructures on substrates.…”

Section: Introductionmentioning

confidence: 99%

Self-Catalytic and Selective Growth of ZnO Nanoneedles by Micro-Contact Printing and CVD

Lee¹,

Kim²,

Sung³

et al. 2008

j nanosci nanotechnol

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A self-catalytic method to selectively grow ZnO nanoneedles is demonstrated by simply combining a conventional micro-contact printing (mu-CP) and two-step metal-organic chemical vapor deposition (MOCVD) techniques. Self-assembled monolayers (SAMs) of octadecyltrichlorosilane (OTS) were patterned on Si substrates by mu-CP. The patterned structures of the ZnO nanoneedles were realized on the SAMs-patterned Si substrates by two-step MOCVD at high temperature of 600 degrees C via the initial preparation of a thin ZnO seed layer with retaining the patterned morphology at low temperature of 170 degrees C. This combined method of mu-CP and self-catalytic two-step MOCVD should be applicable to fabricate the patterned alignments of metal oxide nanostructures.

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Catalyst-free growth of uniform ZnO nanowire arrays on prepatterned substrate

Cited by 26 publications

References 32 publications

Structural and optical properties of ZnO nanorods grown by metal organic chemical vapor deposition

Structural and optical properties of ZnO nanorods grown by metal organic chemical vapor deposition

Growth Mechanism of γ-MnS Nanorod-Arrays by Hydrothermal Method on Anodic Aluminum Oxide Template

Self-Catalytic and Selective Growth of ZnO Nanoneedles by Micro-Contact Printing and CVD

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