Structural and magnetic properties of zeolitic imidazolate framework supported on nickel titanate

Abstract

Metal organic frameworks (MOFs) are one of the greatest significant and rapidly growing groups of porous materials. MOFs are capable materials for a varied range of applications. Zeolitic imidazolate frameworks (ZIFs) denote a new and special class of metal organic frameworks. The zeolitic imidazolate framework and zeolitic imidazolate framework supported on nickel titanate were synthesized by sol-gel method. The Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), N2 adsorption–desorption isotherms and Vibrating sample magnetometer (VSM) methods were used to describe structure, morphology, particle size and the magnetic properties. FTIR results confirmed the formation of Ni-N band for imimdazolate and Ni-O and Ti-O bands for nickel titanate. The results of FESEM and TEM images indicated nickel titanate has particle size about 23 nm and zeolitic imidazolate framework supported on nickel titanate had porous nature with uniform spherical shape of 30 nm. The XRD result showed nickel titanate has illminite phase. BET analysis showed the surface area of nickel titanate nano particles is 31m2g−1, zeolitic imidazolate framework is 1150 m2 g−1 and zeolitic imidazolate framework supported on nickel titanate is 345 m2 g−1. At room temperature samples showed weak ferromagnetism activities. VSM reduced with supporting of nickel titanate by zeolitic imidazolate framework from 0.51 emu/g to 0.35 emu/g.