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Madhavan A.A.,Amrita Center for Nanosciences and Molecular Medicine Ponekkara | Mohandas A.,Amrita Center for Nanosciences and Molecular Medicine Ponekkara | Licciulli A.,University of Salento | Sanosh K.P.,University of Salento | And 5 more authors.
RSC Advances | Year: 2013

The present study provides the first reports on the electrospinning of TiO2-ZnO-graphene composite nanofibers for photovoltaic and biomedical applications. These nanofibers were characterized by spectroscopic and microscopic techniques to evaluate the morphologies and phases. The fiber diameter was found to be ∼210 nm. The graphene content was maintained in the range of 0.2-0.7 weight percent. It was observed that when the graphene content was increased beyond 0.7 weight percent, the continuous fiber morphology was lost. Raman spectroscopy was used to confirm the presence of graphene. Conductivity studies showed a ∼9 times increase in conductance values for the TiO2-ZnO-graphene system as compared to TiO2-ZnO nanofibers. Employing these TiO2-ZnO-graphene fiber composites as photoanodes in dye sensitized solar cells, an efficiency of 3.7% was attained. Antibacterial studies performed on two bacterial strains, namely E.coli and S. aureus, have shown that these composite fibers can be used effectively for antibacterial wound dressing applications. This journal is © The Royal Society of Chemistry.


Roshny S.,Amrita Center for Nanosciences and Molecular Medicine Ponekkara | Ranjusha R.,Amrita Center for Nanosciences and Molecular Medicine Ponekkara | Deepak M.S.,Amrita Center for Nanosciences and Molecular Medicine Ponekkara | Sanoj Rejinold N.,Amrita Center for Nanosciences and Molecular Medicine Ponekkara | And 3 more authors.
RSC Advances | Year: 2014

The present study provides the first reports on a low temperature molten salt route which can generate unique architecture of MnO2 nanospikes arrayed in a peculiar fashion to form micron sized ball morphology. This morphology when employed as supercapacitor electrodes gives an advantage of surface relaxation during the charge-discharge process making it super stable. The study highlights the advantages of nanostructuring of microparticles which can answer the toxicity issues and their potential as a commercial product. This claim in the present study has been validated by cell toxicity study on human dermal fibroblasts, which established that a nano/micro hybrid structure can be relatively less toxic. Cytoskeleton rearrangements were also observed as the size of MnO2 was reduced from micron to nanoscale. A mechanism of the structure formation and the influence of the salt in controlling the process parameters as well as the morphology are also proposed. These electrodes in coin cells exhibited specific mass capacitance value as high as 1100 F g -1 with a power density and energy density of 4.5 W h kg-1 and 14 kW kg-1, respectively. This journal is © the Partner Organisations 2014.

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