ChemInform Abstract: Single‐Source Sol—Gel Synthesis of Nanocrystalline ZnAl₂O₄: Structural and Optical Properties.

Abstract

Single-Source Sol-Gel Synthesis of Nanocrystalline ZnAl 2 O 4 : Structural and Optical Properties.-Nanometer-sized particles of the title compound are synthesized from ZnAl 2 (OR) 8 (R: iPr, tBu) by a sol-gel process (iPrOH, 50 • C, 12 h) followed by calcination at 400-1400 • C. As revealed by single crystal XRD the precursor Zn[Al(OtBu) 4 ] 2 crystallizes in the orthorhombic space group P2 1 2 1 2 1 with Z = 4. 27 Al MAS NMR spectroscopy indicates that ZnAl 2 O 4 possesses an inverse spinel structure below 900 • C, while the normal spinel phase is observed at higher temperatures. The average crystallite size shows an exponential relationship to the calcination temperature. Optical spectroscopy reveals a blue shift of the absorption edge with decreasing particle size. The optical properties show that ZnAl 2 O 4 is a better candidate than ZnO for UV reflective coatings.

Electrospun Nd<SUP>3+</SUP>-doped spinel nanoparticles/nanofibers with both excitation and emission wavelengths in the optical window of cells and tissues

“…7 8 And with the properties of excellent chemical and optical stability, high mechanical resistance, low sintering temperature and high quantum yield, ZnAl 2 O 4 spinel can be used as host material of optical coating, thin film electroluminescence displays, stress imaging device, etc. 9 10 Meanwhile, Nd 3+ -doped inorganic nanomaterials also have been widely studied because of their unique near infrared (NIR) emission, which have significant applications in biological and optical fields. 11 12 For instance, it has been reported that Nd 3+ -doped LaF 3 …”