02179nas a2200181   4500008004100000022001500041245013700056210006900193260000800262300001000270490000700280520148400287100002501771700003001796700002501826700001901851856012701870       2018                        eng d  a 0925-963500a Enhanced microwave absorption property of reduced graphene oxide (RGO)-strontium hexaferrite (SF)/poly (vinylidene) fluoride (PVDF)0 aEnhanced microwave absorption property of reduced graphene oxide  cOCT  a28-340 v893 aEnormous growth in the use of electronic gadgets presents a challenge to develop efficient electromagnetic interference (EMI) shielding materials specifically using composites with properties such as light weight and high shielding due to absorption. In the present work we have synthesized a composite material with three components; Reduced Graphene Oxide (RGO) and Strontium Hexaferrite (SrFe12O19) (SF) bound together by polymer Poly (Vinylidene) Fluoride (PVDF). Composite RGO/SF (RGOSF) was prepared by facile one port chemical reduction method. Surface anchoring of similar to 500 nm of magnetic particles over the graphene sheet was confirmed by Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM). Crystal structure of SF particles was analyzed before and after composite formation with RGO. Effective crystallite size was estimated from both XRD and Raman Spectroscopy which showed similar trend moving from SF to RGOSF to RGOSFPVDF. Polymer composite films of RGOSFPVDF were prepared by hot pressing. Both real and imaginary part of magnetic and dielectric parameters were studied. It was observed that enhancement of interfacial polarization and anisotropic heat loss in PVDF matrix was generated by RGOSF which ultimately created more scattering center and helped in absorption of electromagnetic radiation. Critical film thickness of 3 mm was capable to shield up to 33 dB EM energy of which > 99.9% was due to absorption.1 aAcharya, Sanghamitra1 aGopinath, Chinnakonda, S.1 aAlegaonkar, Prashant1 aDatar, Suwarna  uhttps://library.ncl.res.in/content/enhanced-microwave-absorption-property-reduced-graphene-oxide-rgo-strontium-hexaferrite02524nas a2200253   4500008004100000022001400041245009000055210006900145260000800214300001400222490000700236520166400243653003001907653002901937653003401966653003602000100001802036700001902054700001802073700002502091700001902116700002602135856010902161       2018                        eng d  a1533-488000aInvestigation of disorder in mixed phase, sp(2)-sp(3) bonded graphene-like nanocarbon0 aInvestigation of disorder in mixed phase sp2sp3 bonded graphenel  cAPR  a2504-25120 v183 a<p>Disorder in a mixed phase, sp(2)-sp(3) bonded graphene-like nanocarbon (GNC) lattice has been extensively studied for its electronic and field emission properties. Morphological investigations are performed using scanning electron microscopy (SEM) which depicts microstructures comprising of atomically flat terraces (c-planes) with an abundance of edges (ab planes which are orthogonal to c-planes). Scanning tunneling microscopy (STM) is used to observe the atomic structure of basal planes whereas field emission microscopy (FEM) is found to be suitable for resolving nanotopography of edges. STM images revealed the hexagonal and non-hexagonal atomic arrangements in addition to a variety of defect structures. Scanning tunneling spectroscopy is carried out to study the effect of this short-range disorder on the local density of states. Current versus voltage (I-V) characteristics have been recorded at different defect sites and are compared with respect to the extent of the defect. As sharp edges of GNC are expected to be excellent field emitters, because of low work function and high electric field, enhancement in current is observed particularly when applied electric field is along basal planes. Therefore, it is worthwhile to investigate field emission from these samples. The FEM images show a cluster of bright spots at low voltages which later transformed into an array resembling ledges of ab-planes with increasing voltage. Reproducible I-V curves yield linear Fowler-Nordheim plots supporting field emission as the dominant mechanism of electron emission. Turn on field for 10 mu A current is estimated to be similar to 3 V/mu m.</p>10aField emission microscopy10aGraphene-Like Nanocarbon10aScanning tunneling microscopy10aScanning Tunneling Spectroscopy1 aPatil, Sumati1 aKolekar, Sadhu1 aKumar, Arvind1 aAlegaonkar, Prashant1 aDatar, Suwarna1 aDharmadhikari, C., V.  uhttps://library.ncl.res.in/content/investigation-disorder-mixed-phase-sp2-sp3-bonded-graphene-nanocarbon