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Komathi, Shanmugasundaram,Gopalan, Anantha Iyengar,Lee, Kwang-Pill Royal Society of Chemistry 2010 The Analyst Vol.135 No.2
<P>This is the first report on ultrahigh sensitive and selective electrochemical detection of nanomolar concentrations of dopamine (DA) in the presence of ascorbic acid (AA) at a modified electrode fabricated with a new functional nanocomposite, comprising of multi-walled carbon nanotube (MWNT) grafted silica network (silica NW) and gold nanoparticles (Au NPs) (MWNT-g-silica NW/Au NPs). The fabrication of MWNT-g-silica NW/Au NPs modified electrodes involves two steps: covalent functionaliztion of MWNT with silica NW and deposition of Au NP. Cyclic voltammetry and differential pulse voltammetry experiments were performed for the individual and simultaneous electrochemical detection of DA (in nanomolar concentrations) and AA. Differential pulse voltammograms at ITO/MWNT-g-silica NW/Au NPs modified electrode (ME) revealed that the current response is linear for DA in the concentration range of 0.1 nM–30 nM with a detection limit of 0.1 nM. This is the lowest detection limit reported for DA. A plausible mechanism is presented for the excellent performance of ITO/MWNT-g-silica NW/Au NPs-ME towards nanomolar detection of DA. The results revealed that MWNT, silica NW and Au NPs in ITO/MWNT-g-silica NW/Au NPs-ME synergistically contribute to the ultrasensitivity and selectivity for the electrochemical detection of nanomolar concentrations of DA in the presence of coexisting species.</P> <P>Graphic Abstract</P><P>The matrix of new nanocomposite, porous silica grafted multi-walled carbon nanotube/Au, electrochemically discriminates dopamine from ascorbic acid at nanomolar concentration levels. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b918335c'> </P>
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>
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>
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.