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FESEM images of (a) sample A with the -diameter ZnO NWs, and (b) sample B with the -diameter ones.
Room temperature PL spectra of the as-grown ZnO NWs (samples A and B). Inset exhibits XRD spectra for samples A and B.
Force vs displacement curve of sample A (a) and sample B (b). Inset shows a FESEM image of the buckled ZnO NWs (sample B) in top view.
Critical stress, critical buckling strain, and Young’s modulus of the ZnO NWs.
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