Application of graphene oxide as a hydrothermal catalyst support for synthesis of TiO₂ whiskers

Abstract

How graphene oxide (GO) with its step edges and wrinkles (∼1–2 nm) acts as a catalyst in hydrothermal nucleation and growth is demonstrated.

Ultraviolet Activity as Indicators of Small-scale Magnetic Fields in γ Cassiopeiae

“…Using the Copernicus X-ray camera, Peters (1982) found a rapid X-ray "burst" on 1977 January 27.95; this burst was confirmed by Polidan (1994) and Parmar (1994). At the same time, the Copernicus UV scanners, V1 and U1, slowly scanned the Mg II and Si IV resonance doublets, respectively.…”

Synergetic adsorption and photocatalytic degradation of pollutants over 3D TiO2—graphene aerogel composites synthesized via a facile one-pot route

“…[16][17][18][19] On the other hand, the disappearance of the characteristic peak of (0 0 2) plane for GA at ca. 24.8 o in the XRD patterns for the TiO 2 -GA composites could be explained by the low GA content and the overlapping or screening caused by the strong (1 0 1) peak for TiO 2 .…”

Graphene-Based Modulation on the Growth of Urchin-like Na2Ti3O7 Microspheres for Photothermally Enhanced H2 Generation from Ammonia Borane

“…These oxygen functional groups which act as nucleation sites can maintain the nucleation stage of Na 2 Ti 3 O 7 to a large extent, slowing down the Ostwald ripening. 16 Second, the limited space between neighboring GO sheets could hinder the growth of the Na 2 Ti 3 O 7 microspheres, which is known as the steric effect. 32 Moreover, in contrast to the step-edge-catalyzed cooperative growth of 1D nanostructure, 16 the growth kinetics of our Na 2 Ti 3 O 7 nanowires in the presence of GO was much slower than that of pure Na 2 Ti 3 O 7 nanowires.…”

“…16 Second, the limited space between neighboring GO sheets could hinder the growth of the Na 2 Ti 3 O 7 microspheres, which is known as the steric effect. 32 Moreover, in contrast to the step-edge-catalyzed cooperative growth of 1D nanostructure, 16 the growth kinetics of our Na 2 Ti 3 O 7 nanowires in the presence of GO was much slower than that of pure Na 2 Ti 3 O 7 nanowires. Our observation indicates that the steric effect can play an important role in determining the morphology of nanomaterials by simply adjusting growth kinetics.…”

“…Hybridizing the Na 2 Ti 3 O 7 with graphene has been explored to be an effective route to enhance the electron transfer efficiency because of the superb electrical conductivity of graphene and their derivatives . Besides, graphene sheets are recently demonstrated to have an impact on the crystallization behaviors of oxides (e.g., Sn 3 O 4 and Fe 2 O 3 ) and polymers during wet-chemical or electrospinning fabrication and thus lead to different sizes and/or structures in final products. − Several structures of Na 2 Ti 3 O 7 and their graphene-based composites, such as tube, fiber, and sphere, have been observed and directed in the field of electrochemistry (e.g., rechargeable batteries). Understanding the roles of graphene in manipulating their growth mechanisms, fine structures (e.g., defects), and resultant photo­(electro)­chemistry performances is still extremely controversial, particularly without the aid of capping agents and templates.…”