Modifying the structure and optical characteristics of ZnMn<inf>2</inf>O<inf>4</inf> by alloying with CdS to form heterostructure nanocomposite

Abstract

Nanocomposite (1−x) ZnMn2O4/xCdS (0.0 ≤ x ≤ 0.2) samples are prepared employing co-precipitation and thermolysis procedures. Phase analysis applying X-ray diffraction disclosed the presence of two phases: main ZnMn2O4 (ZMO) phase (~98%) and very minor CdS phase (~2%). The influence of alloying between ZnMn2O4 (ZMO) and CdS on the cell parameters and the phase percentage of the obtained phases is determined; the cell parameter (a) raised slightly but (c) parameter reduced with (x). Fourier transform infrared (FTIR) and XRD Rietveld analysis manifested the incorporation of Cd ions into the ZMO lattice. X-ray photoelectron spectroscopy (XPS) asserted the existence of Cd2+ and S− ions in the ZMO lattice and the valance states of Mn and Zn ions are determined. All optical parameters are improved as the CdS content (x) increased up to 15%, then decreased with a further increase in (x) in the composites. The photoluminescence (PL) intensity is enhanced as ZMO alloyed with CdS. The different emitted colors are also explored using PL technique. The modified properties nominate ZMO/CdS for different optoelectronic and display applications.