Determination of a Morphological Phase Diagram of Titania/Titanate Nanostructures from Alkaline Hydrothermal Treatment of Degussa P25

Insights into the multistep transformation of titanate nanotubes into nanowires and nanoribbons

“…By increasing the treatment duration at 150°C from 24 h to 48 h nanowires and nanotubes had transformed into much longer and wider elongated structures with well-defined edges and good crystallinity, called nanoribbons. The observed temperature of nanotubes to nanoribbons transformation (150°C) was much lower than the recommended in the literature 180°C [9,10] but was enhanced by the prolonged synthesis time. The same types of nanostructures, namely nanoribbons were observed when the hydrothermal reaction temperature increased to 200°C.…”

“…As an example it was reported by Yuan et al [9] that the formation of nanotubes and nanoribbons is affected only by the treatment temperature and formation of nanotubes occurs at a temperature range between 100°C and 180°C, whereas nanoribbons are formed only at temperatures higher than 180°C. Similarly, Morgan et al [10] observed phase transition between nanotubes to nanoribbons above 180°C. However, their analyses of the morphological phase diagram indicated that the effect of temperature was not exclusive in nanoribbon formation and NaOH concentration was a significant contributor.…”

Au–Pd NPs immobilised on nanostructured ceria and titania: impact of support morphology on the catalytic activity for selective oxidation

“…S1 †). 30 The peaks appearing at 24.5°a nd 48.6°are also indicative of tri-titanate 1D nanomaterial. 31 Ceria nanorods display a crystalline structure with multiple sharp diffraction peaks at 2θ of 28.5°, 33.0°, 47.4°, 56.3°, and 69.6°, which respectively correspond to the (111), (200), (220), (311), (400) crystalline planes of the pure cubic phase (ceria fluorite structure, JCPDS 34-0394).…”

Synthesis of hierarchical rose bridal bouquet- and humming-top-like TiO2 nanostructures and their shape-dependent degradation efficiency of dye

“…1 show that the layered titanate phase in the general formula A 2 Ti n O 2n+1 ÁH 2 O (A is Na + or H + , n = 2-8) is obtained in T120 sample. Na-or H-titanate has been commonly found in the materials prepared by the interaction between NaOH solution and titanium precursor without the subsequent acid treatment or washing [13][14][15]. Herein, a series of characteristic peaks at 9.8°, 24°, 28.1°and 48°corresponds to (2 0 0), (1 1 0), (3 1 0) and (0 2 0) diffractions.…”