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Catalytic growth of ZnO nanostructures by r.f. magnetron sputtering.

Arroyo-Hernández M, Alvaro R, Serrano S, Costa-Krämer JL - Nanoscale Res Lett (2011)

Bottom Line: The catalytic effect of gold seed particles deposited on a substrate prior to zinc oxide (ZnO) thin film growth by magnetron sputtering was investigated.The ZnO structures are subsequently deposited by r.f. magnetron sputtering in a UHV chamber, and possible morphological differences between the ZnO grown on top of the substrate and on the gold are investigated.The results indicate a moderate catalytic effect for a deposited gold underlayer of 4 nm, quite close to the gold thin film percolation thickness.

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Affiliation: IMM-Instituto de Microelectrónica de Madrid (CNM-CSIC), Isaac Newton 8, PTM, Tres Cantos, Madrid 28760, Spain. maria.arroyo@imm.cnm.csic.es.

ABSTRACT
The catalytic effect of gold seed particles deposited on a substrate prior to zinc oxide (ZnO) thin film growth by magnetron sputtering was investigated. For this purpose, selected ultra thin gold layers, with thicknesses close to the percolation threshold, are deposited by thermal evaporation in ultra high vacuum (UHV) conditions and subsequently annealed to form gold nanodroplets. The ZnO structures are subsequently deposited by r.f. magnetron sputtering in a UHV chamber, and possible morphological differences between the ZnO grown on top of the substrate and on the gold are investigated. The results indicate a moderate catalytic effect for a deposited gold underlayer of 4 nm, quite close to the gold thin film percolation thickness.

No MeSH data available.


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XRD diffraction spectra of ZnO structures grown on 2 nm (orange) and 4 nm (black) gold film nominal thicknesses.
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Figure 5: XRD diffraction spectra of ZnO structures grown on 2 nm (orange) and 4 nm (black) gold film nominal thicknesses.

Mentions: Finally, XRD was studied for both kinds of ZnO structures (Figure 5). The spectra show the diffraction peaks associated to the sapphire substrate and to the gold film. It can be observed that ZnO grown on 2-nm thickness gold has a polycrystalline structure, with two preferential orientations: (002) and (101). On the other hand, the ZnO structures grown on the 4-nm thickness gold are 'XRD amorphous'.


Catalytic growth of ZnO nanostructures by r.f. magnetron sputtering.

Arroyo-Hernández M, Alvaro R, Serrano S, Costa-Krämer JL - Nanoscale Res Lett (2011)

XRD diffraction spectra of ZnO structures grown on 2 nm (orange) and 4 nm (black) gold film nominal thicknesses.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211855&req=5

Figure 5: XRD diffraction spectra of ZnO structures grown on 2 nm (orange) and 4 nm (black) gold film nominal thicknesses.
Mentions: Finally, XRD was studied for both kinds of ZnO structures (Figure 5). The spectra show the diffraction peaks associated to the sapphire substrate and to the gold film. It can be observed that ZnO grown on 2-nm thickness gold has a polycrystalline structure, with two preferential orientations: (002) and (101). On the other hand, the ZnO structures grown on the 4-nm thickness gold are 'XRD amorphous'.

Bottom Line: The catalytic effect of gold seed particles deposited on a substrate prior to zinc oxide (ZnO) thin film growth by magnetron sputtering was investigated.The ZnO structures are subsequently deposited by r.f. magnetron sputtering in a UHV chamber, and possible morphological differences between the ZnO grown on top of the substrate and on the gold are investigated.The results indicate a moderate catalytic effect for a deposited gold underlayer of 4 nm, quite close to the gold thin film percolation thickness.

View Article: PubMed Central - HTML - PubMed

Affiliation: IMM-Instituto de Microelectrónica de Madrid (CNM-CSIC), Isaac Newton 8, PTM, Tres Cantos, Madrid 28760, Spain. maria.arroyo@imm.cnm.csic.es.

ABSTRACT
The catalytic effect of gold seed particles deposited on a substrate prior to zinc oxide (ZnO) thin film growth by magnetron sputtering was investigated. For this purpose, selected ultra thin gold layers, with thicknesses close to the percolation threshold, are deposited by thermal evaporation in ultra high vacuum (UHV) conditions and subsequently annealed to form gold nanodroplets. The ZnO structures are subsequently deposited by r.f. magnetron sputtering in a UHV chamber, and possible morphological differences between the ZnO grown on top of the substrate and on the gold are investigated. The results indicate a moderate catalytic effect for a deposited gold underlayer of 4 nm, quite close to the gold thin film percolation thickness.

No MeSH data available.


Related in: MedlinePlus