01426nas a2200157   4500008004100000022001400041245015000055210006900205260011000274300001600384490000700400520068000407100002601087700002501113856013001138       2015                        eng d  a1463-907600aCross over from 3D variable range hopping to the 2D weak localization conduction mechanism in disordered carbon with the extent of graphitization0 aCross over from 3D variable range hopping to the 2D weak localiz  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a16178-161850 v173 a<p>The changes in the electrical transport properties and mechanism of conduction in disordered carbon, with the extent of graphitization, are studied and discussed. With heat treatment induced graphitic ordering, the electrical properties are considerably modified, inducing a crossover from strong localization to weak localization behavior. Accordingly, the conduction mechanism is modified from the 3-dimensional variable range hopping (3D VRH) model to the 2-dimensional weak localization (2D WL) model. Results show that carrier-carrier and carrier-phonon interactions play major roles in developing the weak localization behavior with the extent of graphitization.</p>1 aRaj, Kovummal, Govind1 aJoy, Pattayil, Alias  uhttp://library.ncl.res.in/content/cross-over-3d-variable-range-hopping-2d-weak-localization-conduction-mechanism-disordered-001423nas a2200145   4500008004100000245010000041210006900141260000800210300001400218490000800232520086600240100002601106700002501132856012001157       2017                        eng d00a Role of localized graphitization on the electrical and magnetic properties of activated carbon0 aRole of localized graphitization on the electrical and magnetic   cNOV  a5151-51610 v1003 aThe correlation between the magnetic and electrical properties of activated carbon with its microstructure is studied. The changes in the microstructure of activated carbon, after activation at three different temperatures (800 degrees C, 900 degrees C, 1000 degrees C) using different amounts of the activating agent, KOH (KOH/C ratio of 1: 1, 2: 1, 3: 1 and 4: 1), are studied using X-ray diffraction and Raman spectroscopy. The results showed the formation of localized nanographitic domains, along with the changes in the surface area and porosity of the activated carbon. The changes in the microstructure are found to be directly correlated with the magnetic properties and electrical conductivity. The interplay between ordering and disordering parameters in the activated carbon is found to determine the electrical conductivity and magnetic properties.1 aRaj, Kovummal, Govind1 aJoy, Pattayil, Alias  uhttp://library.ncl.res.in/content/role-localized-graphitization-electrical-and-magnetic-properties-activated-carbon