Fan, Hong Jin and Lee, Woo and Hauschild, Robert and Alexe, Marin and Le Rhun, Gwenaël and Scholz, Roland and Dadgar, Armin and Nielsch, Kornelius and Kalt, Heinz and Krost, Alois and Zacharias, Margit and Gösele, Ulrich (2006) Template-assisted large-scale ordered arrays of ZnO pillars for optical and piezoelectric applications. SMALL, 2 (4). pp. 561-568.
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Official URL: http://www3.interscience.wiley.com/journal/1124689...
Spatially separated ZnO pillars, typically 300 nm in diameter and 2 mu m in height, are fabricated via a template-directed approach that leads to long-range hexagonal order. The templates of Au nanodisk arrays are obtained by using metal membranes as a lithography mask. The growth of ZnO pillars is performed in a double-tube system through vapor diffusion-deposition. The growth mechanism of the pillars is studied in detail and is proposed to be a combination of vapor-liquid-solid and vapor-solid models. The piezoelectric and optical properties of single pillars are characterized using piezoresponse force microscopy and micro-photoluminescence spectroscopy, respectively. The pillars show strong excitonic emissions up to room temperature, which indicate a relatively low defect density and good crystalline quality. The obtained piezoelectric coefficient d(33) is (7.5 +/- 0.6) pm V-1, which is to our knowledge the first reported value for a single nanopillar.
|Uncontrolled Keywords:||actuators; nanowires; photoluminescence; piezoelectrics; template synthesis|
|Subjects:||Analytical Science > Microscopy and probe methods|
Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
|Deposited By:||Farnush Anwar|
|Deposited On:||22 Jan 2009 15:09|
|Last Modified:||02 Mar 2009 10:00|
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