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Komathi, Shanmugasundaram,Palaniappan, Subramanian,Manisankar, Paramasivam,Gopalan, Anantha Iyengar,Lee, Kwang-Pill WILEY-VCH Verlag 2010 Macromolecular chemistry and physics Vol.211 No.12
<P>We report the large scale preparation of nanostructured polyaniline-Pd nanoparticles composites (designated as PANI(NS)-PdNPs) through a “seed” induced bulk polymerization. Initially, a small quantity of PANI(NS)-PdNPs was formed inside the cavities of MCM-41 and used as the “seed” for the bulk preparation of PANI(NS)-PdNPs composite. For a comparative purpose a PANI-PdNPs composite was also prepared in the absence of the seed. FESEM image of PANI(NS)-PdNPs composite (bulk) shows nanofibrillar morphology. Further, transmission electron microscopy reveals the presence of spherical Pd nanoparticles. PANI(NS)-PdNPs composite (bulk) showed a good catalytic activity towards reduction of 4-nitrophenol.</P><P> <img src='wiley_img_2010/10221352-2010-211-12-MACP200900640-gra001.gif' alt='wiley_img_2010/10221352-2010-211-12-MACP200900640-gra001'> </P> <B>Graphic Abstract</B> <P>A “seed” induced bulk polymerization technique was proposed for the large scale preparation of nanostructured polyaniline incorporated with Pd nanoparticles composites (designated as PANI(NS)-PdNPs). PANI(NS) exhibited nanofibrils morphology and attached with spherical Pd NPs. The utility of PANI(NS)-PdNPs composite (bulk) as a catalyst for the reduction of 4-Nitrophenol has been demonstrated. <img src='wiley_img_2010/10221352-2010-211-12-MACP200900640-content.gif' alt='wiley_img_2010/10221352-2010-211-12-MACP200900640-content'> </P>
Electrochemical Properties of Nickel Oxide Nanoparticles Loaded Poly(o-toluidine) Composites
Shanmugasundaram Komathi,Pothum Selvi,Paramasivam Manisankar,Anantha Iyengar Gopalan,이광필 한국전기화학회 2011 한국전기화학회지 Vol.14 No.1
New nanocomposites, composed of poly(o-toludine) (POT) and nickel oxide nanoparticles (NiO-NPs), were prepared through oxidative polymerization of o-toludine (OT) in the presence of NiO-NPs. Films of NiO/POT were prepared with different amount of NiO-NPs (x) and different concentrations of OT (y) and designated as NiO(x)/POT(y) nanocomposites (x = amount of NiO-NPs (mg), y = concentration of OT (mM)). Field emission scanning electron microscopy images revealed that NiO-NP_s have nanorod like morphology. The two peaks, 0.39 V and 0.77V,are attributed to the redox conversion of leucoemeraldine to emeraldine and emeraldine to fully oxidized forms of POT, respectively. Electroactivity of the NiO(x)/POT(y) films showed dependence on x and y. Efficient electrocatalysts could be obtained by tuning x and y.
Komathi, Shanmugasundaram,Palaniappan, Subramanian,Manisankar, Paramasivam,Gopalan, Anantha Iyengar,Lee, Kwang-Pill American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.8
<P>This is the first report on the preparation of nanobelts/nanodiscs of poly(1,5-diamino naphthalene) (PDAN-P) in bulk quantities through a 'hard-soft combined templates' approach. PDAN was nanostructured within the channels of MCM-41 (hard template) in the presence of beta-napthalene sulfonic acid (beta-NSA) (soft template) and further used as the seed for the bulk preparation of pure PDAN nanobelts/nanodiscs of PDAN (PDAN-P). Field emision scanning electron microscope image reveals that a typical nanobelt has a length of approximately 3 microm, with a uniform breadth of approximately 150 nm and a thickness of approximately 50 nm. UV-Visible spectrum reveals that the electronic features of PDAN-P are different from PDAN prepared by conventional method (PDAN-C). The electrochemical and interfacial characteristics of PDAN-P were evaluated by cyclic voltammetry and impedance spectroscopy and compared with PDAN-C. The current density characteristics of ITO/PDAN-P and ITO/PDAN-C were also compared. The potential for the onset of current and the current densities beyond the onset potentials were higher at ITO/PDAN-P than for ITO/PDAN-C. Results from electrochemical imedance spectroscopy informed that the ac conductivity of PDAN-P is higher than PDAN-C. Thus, PDAN-P exhibits distinctly different electronic and electrochemical characteristics as compared to PDAN-C.</P>