Structural, Optical, and Ferroelectric Behaviors of Cu1-xLixO (0 ≤ x ≤ 0.09) Nanostructures

doi:10.1007/s40195-014-0046-2

Abstract

Abstract:

We report structural, optical, and ferroelectric behaviors of lithium-doped copper oxide (Cu_1-xLi_xO with x = 0.0, 0.05, 0.07, and 0.09) nanostructures synthesized by hydrothermal method. The XRD pattern indicates the pure phase formation of CuO without any impurity, and the crystallite size is found to be increases for x = 0–0.07 and decreases for x = 0.09. FESEM analysis shows that the average size of Cu_1-xLi_xO nanostructures increases with the increasing the Li-doping concentrations up to 7% and then decreases for 9% Li doping concentration. Moreover, Raman and photoluminescence spectrum also confirm the phase formation of CuO. A significant reduction in optical band gap is observed up to x = 0.07, and then band gap increases for x = 0.09 due to segregation of the impurities on the surface or grain boundaries, which may suppress the grain growth and results the enhancement in optical band gap. Moreover, a weak ferroelectricity is observed in CuO nanostructures for pure and 9% Li doping through polarization versus electric field (P–E).

Key words: CuO nanostructure, Optical properties, PL and Raman spectroscopy

Prakash Chand, Anurag Gaur, Ashavani Kumar. Structural, Optical, and Ferroelectric Behaviors of Cu_1-xLi_xO (0 ≤ x ≤ 0.09) Nanostructures[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(2): 306-312.

Figures/Tables 6

Fig. 1 Room temperature XRD patterns of Cu1-xLixO with x = 0.0, 0.05, 0.07 and 0.09

Fig. 2 Field emission scanning electron microscope (FESEM) images of Cu1-xLixO nanostructures: ax = 0.0, bx = 0.05, cx = 0.07, dx = 0.09 (inset showing the magnified image of CuO nanostructures)

Fig. 3 Room temperature photoluminescence (PL) spectra of Cu1-xLixO with x = 0.0, 0.05, 0.07 and 0.09

Fig. 4 Room-temperature Raman spectra for Cu1-xLixO with x = 0.0, 0.05, 0.07 and 0.09

Fig. 5 (αhυ)2 versus photon energy (hυ) plots for Cu1-xLixO with x = 0.0, 0.05, 0.07 and 0.09 (inset showing the Li content versus Eg plots)

Fig. 6 P–E hysteresis loops of Cu1-xLixO with x = 0.0 a and 0.09 b at fixed frequency 100 Hz and room temperature

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