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(a) TEM image of the 4.0 nm NPs dispersed and vertically aligned onto the hydroxyl functionalized substrate. (b) HRTEM cross section image perpendicular to the  direction ( axis) of the same NPs.
Normalized PL spectra of the NPs of different size, following a nonresonant excitation (excitation wavelength ). The vertical arrow indicates the position of the exciton transition in bulk ZnO.
6.6 nm NPs linear polarization spectra after a QR excitation at 355 nm (squares) and 360 nm (triangles). Black and gray arrows indicate the position of the different laser excitations. The PL spectrum following a nonresonant excitation (290 nm) is also displayed (solid line). Circles reproduces the 6.6 nm NPs linear polarization degree after the 360 nm QR circular excitation .
Time decays of the co- and counter- polarized components of the PL after a excitation at 360 nm of the 6.6 nm NPs. The corresponding PL linear polarization degree is also plotted (blue circles). The dotted line is a guide to the eye. The PL intensities are integrated between 365 and 366 nm ( below excitation).
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