2015 Fiscal Year Final Research Report
Improvement of elastic and piezoelectric response of ZnO nanorods grown in aqueous solution
| Project/Area Number |
26790046
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Thin film/Surface and interfacial physical properties
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| Research Institution | Osaka University (2015)
University of Tsukuba (2014) |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | 圧電性半導体 / ZnO自立ナノロッド / 選択的溶液成長 / 応力下その場観察 / 単一構造評価 |
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| Outline of Final Research Achievements |
Arrayed ZnO free-standing nanorods are synthesized on a patterned substrate in the precursor aqueous solution for potential piezoelectric applications. Mechanical and piezoelectric properties of single hexagonal ZnO nanorod are investigated by unique nanoprobe-CL(cathodoluminescence) techniques, which is based on a low-temperature SEM-CL nanospectroscope with an in-situ nanomanipulator of a metal probe-electrode or a force sensor.
We have revealed that lateral growth sectors of a hexagonal ZnO nanorod has a higher residual carrier concentration than the axial growth sector which can be a short circuit of the piezoelectric charges degrading the output power and that the as-grown ZnO nanorod exhibits a high mechanical strength with uniaxial fracture strain as high as 0.04 which is promising for nanoscale piezoelectronics. We have succeeded to suppress the nanorod lateral growth and realized the direct growths of ZnO nanorods on Au film, to improve the piezoelectric properties.
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| Free Research Field |
半導体物性評価
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