Yadav, P. A. (2012) Polymer derived functional carbon and carbon based nanocomposites. PhD thesis, CSIR-National Chemical Laboratory, Pune.

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The technological and scientific potentials of carbon based nanomaterials is certainly bright as revealed in the present study on carbon nanoscrolls, porous graphene, single sheet graphene, magnetite-graphene oxide, carbon coated ZnO etc. Moreover, the ultimate use of these carbon nanomaterials is strongly dependent upon the ability to precisely control their dimension, composition, surface property, phase purity and crystal structure. As the basic building block of these carbon nanostructures is a sheet of carbon in hexagonal network (graphene), these structures have high surface area together with enhanced conductivity, which is important for many applications. This work hence opens the new perceptive towards promising synthesis methods and developments of graphene based nanostructures to stretch the applications of these fascinating nanomaterials in the field of energy and environment. During the course of the present research work, we have investigated various methods for the synthesis of carbon based nanomaterials and their applications for energy storage, field-effect transistor and photocatalysis. The key concepts in nanoscience and a literature survey of the properties and applications of carbon nanomaterials have been discussed in the previous sections. These constitute the First Chapter. In the Second Chapter, a brief overview of the techniques used for the synthesis of carbon nanomaterials is presented. Furthermore, a general outline of the instruments and methods used for the characterization of these carbon nanomaterials is also presented. The Third Chapter discusses the synthesis of carbon nanoscrolls starting from pyrolysis of polymer. Pyrolysis of poly (acrylic acid co maleic acid) sodium salt leads to formation of carbon form and sodium carbonate. The carbon part of decomposition products undergo self-assembly upon its aqueous soaking to form carbon nanoscrolls. We also discuss synthesis of magnetite-graphene oxide (M-GO) composite by pyrolysis route. In the Fourth Chapter, we have demonstrated the synthesis of hierarchically porous graphene with hexagonal nonopores. It is a catalyst-free synthesis leading to single-layer-graphene-assembled carbon without use of any template. The as-synthesized sample exhibits high surface area of about 1720 m2/g and shows bulk specific conductivity of 23 S/m. The material exhibits excellent supercapacitance performance in aqueous medium with maximum specific capacitance of 154 F/g at a current density of 0.5 A/g. In the Fifth Chapter, we report on the synthesis of large area single layer graphene. It is a catalyst-free synthesis without use of any template. The as-synthesized graphene exhibits high surface area of about 350 m2/g and shows bulk specific conductivity of 90 S/m. This graphene also shows good CV behaviour with approximate specific capacitance of 120-140 F/g. We have used this graphene for making graphene/P3HT composite and used this composite as a channel material for field effect transistor application. In the Sixth Chapter, we report on synthesis of anisotropic structure of carbon coated ZnO nanoroads. The as synthesized carbon coated ZnO shows efficient visible light photocatalytic activity. Moreover it is also resistant to degradation by and scavenging of the dye without hindrance to charge transfer; a characteristic of significant interest to optical device applications. The Seventh Chapter summarizes the work described in this thesis by presenting the salient features of the work and also mentions the possible avenues for future investigations. Appendix I follows the work done on investigation of observation of strong ferroelectricity in hydrated sodium carbonate.

Item Type: Thesis (PhD)
Subjects: Polymer Science and Engineering
Depositing User: Mr. Prasad Yadav
Date Deposited: 05 Apr 2013 07:19
Last Modified: 26 Jul 2017 08:03
URI: http://ncl.csircentral.net/id/eprint/1163

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