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SEM image of ZnO nanotube prepared by metal organic chemical vapor deposition.
(Color online) PL spectra from ZnO nanotubes for selected pressures consist of two excitons emissions and a very broad yellow emission band.
(Color online) Dependence of the energy positions on pressure for the various observed emissions in ZnO nanotubes sample. The solid line represents the result of the best quadratic fitting.
Pressure coefficients of various observed emissions observed in the ZnO nanotubes studied in this work.
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