Unveiling of Mn doped TiO2 nanoparticles for efficient room temperature gas sensing performance

• Main Authors: Jayasaranya, N., Ezhil Pavai, R., Sagadevan, Suresh, Balu, L., Manoharan, C.
• Format: Article
• Published: Elsevier 2024
• Subjects: QD Chemistry
• Online Access: http://eprints.um.edu.my/44750/; https://doi.org/10.1016/j.inoche.2024.112168

In this study, pristine TiO2 and Mn-doped TiO2 nanoparticles were hydrothermally synthesized at different molar ratios (1, 3, and 5 ). Powder X-ray diffraction (XRD) analysis revealed a pristine anatase phase with a tetragonal structure and an average crystallite size of 7–12 nm. Fourier Transform Infrared (FTIR) spectra identified the presence of metal oxide in the synthesized nanoparticles. The emission peak observed at 647 nm (red emission) due to oxygen bond vacancies, were detected using photoluminescence (PL). The calculated band gap values of pristine and Mn-doped TiO2 were 3.69 and 3.56 eV respectively, from UV-Diffuse Reflectance Spectroscopy. FE-SEM and HRTEM images of the Mn-doped TiO2 nanoparticles revealed agglomerated cubic particles. The magnetic properties of the doped sample exhibited soft ferromagnetic behavior. The N2 adsorption/desorption isotherms unveiled an increased specific surface area of 491.18 m2g−1, accompanied by a pore size measuring 3.6 nm. Mn-doped TiO2 nanoparticles exhibit high gas-sensing properties towards acetone with good sensitivity, low response and recovery times. © 2024 Elsevier B.V.