Synthesis of Uniform Size Rutile TiO2 Microrods by Simple Molten-Salt Method and Its Photoluminescence Activity

Abstract

Uniform-size rutile TiO2 microrods were synthesized by simple molten-salt method with sodium chloride as reacting medium and different kinds of sodium phosphate salts as growth control additives to control the one-dimensional (1-D) crystal growth of particles. The effect of rutile and anatase ratios as a precursor was monitored for rod growth formation. Apart from uniform rod growth study, optical properties of rutile microrods were observed by UV−visible and photoluminescence (PL) spectroscopy. TiO2 materials with anatase and rutile phase show PL emission due to self-trapped exciton. It has been observed that synthesized rutile TiO2 rods show various PL emission peaks in the range of 400 to 900 nm for 355 nm excitation wavelengths. All PL emission appeared due to the oxygen vacancy present inside rutile TiO2 rods. The observed PL near the IR range (785 and 825 nm) was due to the formation of a self-trapped hole near to the surface of (110) which is the preferred orientation plane of synthesized rutile TiO2 microrods.

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“…All of the diffraction peaks align with the characteristic crystal facets of rutile. This finding matches the standard rutile TiO 2 card (JCPDS 21-1276), and similar results are confirmed in the relevant literature . The presence of these well-defined XRD peaks unequivocally confirms that the TiO 2 layer possesses a crystalline structure.…”

“…All of the diffraction peaks align with the characteristic crystal facets of rutile. This finding matches the standard rutile TiO 2 card (JCPDS 21-1276), and similar results are confirmed in the relevant literature 39. The…”

“…This finding matches the standard rutile TiO 2 card (JCPDS 21-1276), and similar results are confirmed in the relevant literature. 39 The presence of these well-defined XRD peaks unequivocally confirms that the TiO 2 layer possesses a crystalline structure. Furthermore, the identification of these specific planes indicates that the TiO 2 crystals within the layer belong to the rutile phase.…”

Pure Epigallocatechin-3-gallate-Assisted Green Synthesis of Highly Stable Titanium Dioxide Nanoparticles

“…These bands can also be noticed in the spectrum of pure EGCG, confirming the capping of TiO 2 NPs with EGCG molecules in EGCG-TiO 2 NPs. Both NPs present broad absorption bands with peaks at 3229 cm −1 (chem-TiO2 NPs) and 3317 cm −1 (EGCG-TiO2 NPs) that can be assigned to O-H stretching modes of surface hydroxyl groups from moist in the sample [38]. Similarly, the peaks at 1636 cm −1 (chem-TiO2 NPs) and ~1630 cm −1 (EGCG-TiO2 NPs) are associated with the bending of OH groups from water at the surface of NPs [38].…”

Special Issue “Synthesis of TiO2 Nanoparticles and Their Catalytic Activity”

“…The metal-modified TiO 2 coatings demonstrated high antimicrobial activity against M. lysodeicticus, while the bare TiO 2 could maintain enzymatic activity [ 5 ]. Using a simple molten-salt method, Ngo et al synthesized rutile TiO 2 microrods with uniform sizes [ 6 ]. Oxygen vacancies were generated in rutile TiO 2 , leading to varied photoluminescence emission properties from the wavelength of 400 to 900 nm [ 6 ].…”