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(a) XRD patterns of ZnO NPs with various milling times (t m). The dependences of (b) the crystallite size and (c) the lattice constants on t m. The inset of (b) shows the W-H plot for the sample with t m = 100 h.
RS spectra of the NP samples excited by a wavelength of λ = 488 nm. The inset plots the t m dependences of the I 1/I 2 ratio and the relative intensity of E 2(H), I 2.
(a, b) Temperature dependences of M FC and M ZFC (for an applied field of 1000 Oe), and (c) M-H data of some representative ZnO NP samples.
Room-temperature ESR spectra of some representative ZnO NP samples.
(a) Zn K-edge XAFS spectra, (b) Fourier-transformed EXAFS spectra, and (c) Zn K-edge EXAFS oscillations for the NP samples.
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