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Thermal transition behaviour of iron oxide-polypyrrole nanocomposites
KomillaSuri,S.Annapoorni,R.P.Tandon,C.Rath,V.K.Aggrawal 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3
Distinct thermal transitions have been observed in nanocomposites based on iron oxide–polypyrrole prepared by simultaneous gelation and polymerization process. The transition behaviour for various iron oxide–polypyrrole compositions was investigated with the help of differential scanning calorimetery. It has been observed that the samples show a magnetic to nonmagnetic transition at 410 C. The presence of exothermic peak at 410 C is a strong indication of magnetic transition corresponding to c-Fe2O3 phase of iron oxide to a nonmagnetic a-Fe2O3 phase in these nanocomposites. However such a transition was not observed in nanocomposites containing lesser concentration of conducting polymer. 2002 Elsevier Science B.V. All rights reserved.
AmitL.Sharma,S.Annapoorni,말호트라 한국물리학회 2003 Current Applied Physics Vol.3 No.2, 3
Poly(2-uoroaniline) has been electrochemically deposited on ITO coated glass plates in the form of thin lms using 4 M per-chloric acid as electrolyte. These polymeric lms have been spectroscopically characterized by FT-IR and UV-visible spectropho-tometric methods. Room temperature electrical conductivity of the polymeric lms was measured and found to be lower than that ofpolyaniline lms. The SEM studies show the blunt needle like surface morphology of the polymeric lm.physical adsorption method. The redox characterization of poly(2-uoroaniline) and poly(2-uoroaniline)/GOX lms has beencarried out by cyclic voltammetry technique. Amperometric detection ofb-glucose was carried out by using the above enzymeimmobilized polymeric lm as a working electrode and Ag/AgCl as a reference electrode at a bias voltage of 0.2 V over a physi-ological range. The electrode carrying GOX was found to be stable up to 32 days.. 2002 Elsevier Science B.V. All rights reserved.
Defects mediated diffusion in Pt/Co/Pt multilayers induced by dense electronic excitations
Neeru Sehdev,Rohit Medwal,Zener Sukra Lie,Dinesh Chandra Agarwal,K. Asokan,D. Kanjilal,S.Annapoorni 한국물리학회 2014 Current Applied Physics Vol.14 No.3
Present study compares the effects of 200 MeV Ag15þ and 100 MeV O7þ ion irradiations on the structural, interfacial mixing and magnetic properties of annealed Pt/Co/Pt layers fabricated by DC magnetron sputtering. X-ray diffraction analysis shows that ion irradiations coupled with post annealing results in the formation of the face centred tetragonal L10 CoPt phase. Irradiation using 200 MeV Ag15þ ions having higher ionizing energy transfer to the film was found to be more efficient in causing structural phase transition as compared with that using 100 MeV energy O7þ ions having lower ionizing energy transfer at similar fluence. Rutherford back scattering analysis reveals the role of defect mediated inter-atomic diffusion in tailoring the alloy composition of the film irradiated by different energetic ions. A broad magnetic switching field distribution for O7þ ion irradiated films compared to Ag15þ ion irradiation was evident from the magnetic measurements. The contribution of alloy composition to switching field distribution has been discussed in details. Above results showed that the electronic energy loss and fluence dependent defects, generated by irradiation, played an important role in tuning the structural, atomic diffusion and magnetic reversal properties of Pt/Co/Pt.