By Professor of Chemistry Toshiaki Enoki, Swapan K Pati, C N R Rao
Graphene, a unmarried sheet of graphite, has an unconventional digital constitution that may be defined when it comes to massless Dirac Fermions. This attention-grabbing digital characteristic is not just a massive basic factor in condensed topic physics but additionally holds destiny promise in post-Si electronic/spintronics gadget purposes. Graphene is the main primary construction block, with which various carbon-based fabrics comparable to graphite, fullerene and carbon nanotubes may be created. the various chemical, digital and magnetic homes of nanographene and graphene are usually as a result of their geometrical digital constitution. This e-book provides the frontiers of graphene study starting from very important matters in condensed topic physics and chemistry to complicated equipment purposes.
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Extra info for Graphene and Its Fascinating Attributes
Meyer, J. , Novoselov, K. , Roth, S. and Geim, A. K. (2006). Raman Spectrum of Graphene and Graphene Layers, Phys. Rev. , 97, pp. 187401. 23. Pimenta, M. , Dresselhaus, M. , Cancado, L. , Jorio, A. and Sato, R. (2007). Studying disorder in graphite-based systems by Raman spectroscopy, Phys. Chem. Chem. , 9, pp. 1276-1290. 24. , Hierold, C. and Wirtz, L. (2007). , 7, pp. 238-242. 25. , Piner, R. D, An, S. , Velamakanni, A. and Ruoff, R. S. (2009). , 9, pp. 1593-1597. 26. Hummers, W. and Offeman, R.
All these samples show the divergence between field-cooled (FC) and zero-field-cooled (ZFC) data at 500 Oe (Fig. 13(a)) and the divergence nearly disappears on the application of 1T as can be seen from the inset of Fig. 13(a). All the samples show magnetic hysteresis at room temperature (Fig. 13(b)) . Magnetic properties of graphene reveal that dominant ferromagnetic interactions coexist along with antiferromagnetic interactions in all of the samples, somewhat like in frustrated or phase-separated systems.
13(a). All the samples show magnetic hysteresis at room temperature (Fig. 13(b)) . Magnetic properties of graphene reveal that dominant ferromagnetic interactions coexist along with antiferromagnetic interactions in all of the samples, somewhat like in frustrated or phase-separated systems. It is not possible to exactly pin down the origin of magnetism in the graphene samples although defects, and edge effects, are likely to play a major role. Adsorption of benzene solutions of TTF and TCNE has a profound effect on the magnetic properties of graphene.