Abstract
ZnO and Mn-doped Zn0.92Y0.08-xMnxO (x = 0, 0.01, 0.02, 0.04, 0.06) nanoparticles were synthesized hydrothermally and thoroughly characterized structurally, morphologically, and optically. X-ray diffraction (XRD) confirmed their crystalline wurtzite structure, with dopant concentration affecting lattice parameters, causing expansion or contraction. X-ray photoelectron spectroscopy (XPS) confirmed Mn and Y integration into the ZnO matrix. Scanning electron microscopy (SEM) showed morphological shifts from rods to flowers with increased Mn doping concentration. UV–visible absorption revealed optical band changes due to doping. Fourier transform infrared spectroscopy (FTIR) identified Zn–O, Y–O, and Mn–O bonds. Photoluminescence (PL) indicated intensity shifts with doping, suggesting dopant influence on defect-related emissions. Doped ZnO nanoparticles displayed superior hydrogen gas sensing, especially x = 0.04 at 250 °C, attributed to smaller size and structural changes.
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