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[(a) and (b)] XRD patterns of ZnO NW arrays on ZnO seed layer synthesized from and sols, respectively. Relative intensity of (002) peak is shown in the respective figure. [(c) and (d)] EDAX analysis of NW arrays.
(Color online) [(a) and (b)] FESEM images of the ZnO NW arrays on ZnO seeded layer synthesized from and sols, respectively. The inset shows the magnified view of the hexagonal and trapezoidal NWs. Scale bar is . [(c) and (d)] TEM image of the ZnO NWs on seed layer synthesized from and sols, respectively. Trapezoidal shape is denoted by a circle. The insets show the corresponding HRTEM image of a ZnO NW. (e) Longitudinal growth model for the formation of hexagonal ZnO NWs on the seeded layer for sol. (f) Longitudinal and transversal growth models for the formation of trapezoidal ZnO NWs on the seeded layer for sol. Only the unblocked part of the NW can still grow and form the trapezoidal-shaped NW.
(Color online) [(a) and (b)] Transient photocurrent spectra of ZnO NW arrays on the seeded layers for and sols, respectively.
(Color online) (a) Change in the photocurrent of ZnO NW arrays on the seeded layer for sol under UV illumination in air and vacuum. (b) Model showing the influence of absorbed oxygen and water molecules in dark and under UV illumination.
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