AIP Advances (Dec 2017)

Synthesis and optical properties of Mg-Al layered double hydroxides precursor powders

  • Chia-Hsuan Lin,
  • Hsueh-Liang Chu,
  • Weng-Sing Hwang,
  • Moo-Chin Wang,
  • Horng-Huey Ko

DOI
https://doi.org/10.1063/1.4990832
Journal volume & issue
Vol. 7, no. 12
pp. 125005 – 125005-10

Abstract

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The synthesis and optical properties of Mg-Al layered double hydroxide (LDH) precursor powders were investigated using X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED), high-resolution TEM (HRTEM), UV-transmission spectrometer, and fluorescence spectrophotometer. The FT-IR results show that the intense absorption at around 1363–1377 cm-1 can be assigned to the antisymmetric ν3 mode of interlayer carbonate anions because the LDH phase contains some CO32-. The XRD results show that all of the Mg-Al LDH precursor powders contain only a single phase of [Mg0.833Al0.167(OH)2](CO3)0.083·(H2O)0.75 but have broad and weak intensities of peaks. All of Mg-Al LDHs precursor powders before calcination have the same photoluminescence (PL) spectra. Moreover, these spectra were excited at λex = 235 nm, and the broad emission band was in the range 325-650 nm. In the range, there were relatively strong intensity at around 360, 407 and 510 nm, respectively.