摘要
A cupric oxide （CuO） nanocrystal-doped NaC1 single crystal and a pure NaCl single crystal are grown by using the Czochralski （Cz） method. A number of techniques, including X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive X-ray （EDX） analysis, Fourier transform infrared （FT-IR） spectroscopy, Raman spectroscopy, optical absorption in the UV-visible range, and photoluminescence （PL） spectroscopy are used to characterize the obtained NaCl and NaCI：CuO crystals. It is observed that the average radius of CuO crystallites in NaCI：CuO crystal is about 29.87 nm, as derived from the XRD data analysis. Moreover, FT-IR and Raman spectroscopy results confirm the existence of the monoclinic CuO phase in NaC1 crystal. UV-visible absorption measurements indicate that the band gap of the NaCI：CuO crystal is 434 nm （2.85 eV）, and it shows a significant amount of blue-shift （AEg = 1 eV ） in the band gap energy of CuO, which is due to the quantum confinement effect exerted by the CuO nanocrystals. The PL spectrum of the NaCI：CuO shows a broad emission band centred at around 438 rim, which is consistent with the absorption measurement.
A cupric oxide （CuO） nanocrystal-doped NaC1 single crystal and a pure NaCl single crystal are grown by using the Czochralski （Cz） method. A number of techniques, including X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive X-ray （EDX） analysis, Fourier transform infrared （FT-IR） spectroscopy, Raman spectroscopy, optical absorption in the UV-visible range, and photoluminescence （PL） spectroscopy are used to characterize the obtained NaCl and NaCI：CuO crystals. It is observed that the average radius of CuO crystallites in NaCI：CuO crystal is about 29.87 nm, as derived from the XRD data analysis. Moreover, FT-IR and Raman spectroscopy results confirm the existence of the monoclinic CuO phase in NaC1 crystal. UV-visible absorption measurements indicate that the band gap of the NaCI：CuO crystal is 434 nm （2.85 eV）, and it shows a significant amount of blue-shift （AEg = 1 eV ） in the band gap energy of CuO, which is due to the quantum confinement effect exerted by the CuO nanocrystals. The PL spectrum of the NaCI：CuO shows a broad emission band centred at around 438 rim, which is consistent with the absorption measurement.
基金
supported by the Crystallography Laboratory of the University of Constantine, Algeria
