Synthesis and Characterisation of Nanocomposites of TiO₂ and MgAl₂O₄ for Gas Sensing Applications

Abstract

In this study, a conventional mixed oxide method was used to prepare nanocomposites of titanium dioxide and magnesium aluminate samples. The synthesis process of a low concentration of posttransition metal oxide like TiO2 with pre-transition metal oxides like MgO and Al₂O3 and its gas sensing behaviour were investigated. The present work focuses on applying different nanocomposite samples of (TiO2) x and MgAl₂O₄ (at x = 0 magnesium aluminate namely MA; x = 0°25 and 0.75 N namely MAT0.25 and MAT0.75 at 4 and 10 wt% of TiO2 in MgAl₂O₄ respectively and TiO₂ namely T) for gas sensing applications (O₂, CO and H₂ gases). The composite samples were characterized by their X-ray diffraction pattern, Fourier transform infrared spectroscopy, a particle size analyzer, X-ray fluorescent spectroscopy, scanning electron microscopy, ultraviolet visible spectroscopy, and Brunauer–Emmett–Teller methods. The response to changes in gas pressure (from 0.5 to 2 bar) was quantitatively studied in all samples (MA, MAT0.25, MAT0.75 and T) at different operating temperatures from 300 to 600 K. All samples showed a fast and improved gas response at different operating temperatures. Moreover, it was observed that the gas response of the composite sample, MAT0.75 increased by 11% more than the pure titanium sample at an operating temperature of 360 K, on the passage of O₂ gas.

Solid State Reaction Synthesis and Characterization of Aluminum Doped Titanium Dioxide Nanomaterials

“…For more applications of Transparent conductive oxides (TCO) materials in applied mathematics, Boubaker polynomials can be used to investigate the properties of these materials [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32]. Al doped TiO 2 could be doped in ntype or p-type materials by a very large number of synthesis techniques/experiments, such as a hydrothermal process [19], non-hydrolytic sol-gel method [20], gas sensing [33], and a solid-state method [34].…”

Extended Positron–Positronium Trapping Defects in the MgAl2O4 Spinel Ceramics

“…[ 4,5 ] The material of active element based on MgAl 2 O 4 spinel is technologically promising, as it does not require additional operations of posttechnological optimization. [ 6–8 ]…”

“…[4,5] The material of active element based on MgAl 2 O 4 spinel is technologically promising, as it does not require additional operations of posttechnological optimization. [6][7][8] As it is well known that many of functional properties of MgAl 2 O 4 spinel obtained and modified under different influences (technology, [9,10] temperature, [11,12] radiation, [13][14][15][16] additives, [17,18] etc.) are determined by the microstructure of their grains, defect-related grain boundaries, and pores.…”