Comparative study of TMO based hollow and solid nanostructures for supercapacitor applications.

No abstract

Herein, we report the fabrication of a-Fe 2 O 3 /TiO 2 hybrid structures in the form of microrods, microtubes and nanorods by co-precipitation method and via wet chemical method. The combination of a-Fe 2 O 3 and mixed phase (anatase and rutile) TiO 2 as hybrid structure not only enhances the light absorption ability but also facilitates charge separation resulting effective dye degradation. The detailed studies of photocatalytic dye degradation on a-Fe 2 O 3 /TiO 2 system were carried out to understand the mechanism. The a-Fe 2 O 3 /TiO 2 hybrid nanorods exhibited the best performances as photocatalyst as well as supercapacitor electrode with excellent stability in both cases. The a-Fe 2 O 3 /TiO 2 hybrid nanorods exhibited efficient 88% dye degradation after 120 min as photocatalyst and a specific capacitance value of 478.40 F g À1 was achieved at current density of 1 A g À1 with a capacity retention value of 92% at 2 A g À1 after 1000 cycles. It is anticipated that the anisotropic structure as well as the synergistic effect of a-Fe 2 O 3 and TiO 2 make the hybrid material a promising photocatalyst as well as potential electrode for supercapacitor.[a] M.

Graphene based nanomaterials have attracted tremendous attention for their potential applications in various fields. In the present investigation, the growth of graphene on silicon substrate using thermal chemical vapor deposition (Thermal-CVD) method has been reported and the biocompatibility of obtained yield has been critically assessed. Raman spectra confirm the formation of graphene which was found to be the best to obtain minimal number of layers of graphene. Three prominent peaks have been observed at approximately 1360[Formula: see text]cm[Formula: see text] (D Peak), 1595[Formula: see text]cm[Formula: see text] (G Peak) and 2700[Formula: see text]cm[Formula: see text] (2D Peak). Haemolysis test and simulated body fluid (SBF) test are performed to check the biocompatibility of the synthesized graphene samples. Atomic force micrographs of the samples are taken prior and after soaking them in SBF solution to study their interaction with the fluid. Haemolysis percentage is determined using UV-Vis to determine the hemocompatible nature of the samples. The results of haemolysis and SBF test demonstrated that Thermal-CVD grown graphene samples are biocompatible.