Effect of Pressure-Assisted Heat Treatment on the Crystalline Phase of Titanium Dioxide, Niobium Pentoxide, and Ruthenium-Modified Oxides
Pietra B. Pires, Maria E. K. Fuziki, Giane G. Lenzi, Simone do Rocio F. Sabino, Andressa Novatski, Sergio M. Tebcherani, Daniele Toniolo Dias
TL;DR
This study shows how pressure-assisted heat treatment changes the structure and properties of titanium dioxide, niobium pentoxide, and ruthenium-modified oxides, making them better for solar-driven reactions.
Contribution
The study demonstrates that PAHT stabilizes crystalline phases at lower temperatures and enhances solar absorption in modified oxides.
Findings
PAHT significantly reduces the band gap and increases visible light absorption in 100Ti:1Ru oxide.
Crystalline phases of titanium dioxide and niobium pentoxide are stabilized at lower temperatures with PAHT.
Sol–gel-derived oxides show improved structural and optical properties after PAHT treatment.
Abstract
Titanium dioxide, niobium pentoxide, and ruthenium-modified tungsten were synthesized using sol–gel methodology. The effect of pressure-assisted heat treatment (PAHT) on their structural, morphological, and optical properties was investigated. The X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray, UV–vis diffuse reflectance spectroscopy, and Raman spectroscopy analyses highlighted significant changes in structural, morphological, and optical properties, especially in the phase, band gap energy, and visible light absorption after PAHT. The results indicated that the 100Ti:1Ru oxide, obtained by the sol–gel method, calcined at 800 °C, and subjected to PAHT, presented promising characteristics for chemical reactions activated by solar radiation, with a notable reduction in band gap and visible absorption. Furthermore, PAHT promoted more stable crystalline phases at…
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Taxonomy
TopicsTiO2 Photocatalysis and Solar Cells · Pigment Synthesis and Properties · Transition Metal Oxide Nanomaterials