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Biomediated Silver Nanoparticles for the Highly Selective Copper(II) Ion Sensor Applications
Kirubaharan, C. Joseph,Kalpana, D.,Lee, Yang Soo,Kim, A. R.,Yoo, Don Jin,Nahm, Kee Suk,Kumar, G. Gnana American Chemical Society 2012 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.51 No.21
<P>Nanoparticles synthesis is an evergreen research field of 21st century in which the connotation of the biomediated experimental process is highly imperative. Biomediated silver nanoparticles were synthesized with the aid of an eco-friendly biomaterial, namely, aqueous <I>Azadirachta indica</I> extract. The effect of pH and temperature on the formation of silver nanoparticles was analyzed. Formation of the silver nanoparticles was verified by surface plasmon spectra using a UV–vis spectrophotometer. Morphology and crystalline structure of the prepared silver nanoparticles were characterized by TEM and XRD techniques, respectively. Furthermore, the biomediated silver nanoparticles without any surface modification were used for the heavy metal ion sensors in aqueous media. The prepared silver nanoparticles were successful in detecting even the minimal amount of heavy metal copper(II) ion and exhibited excellent specific metal ion selectivity.</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie3003232'>ACS Electronic Supporting Info</A></P>
Gnana kumar, G.,Joseph Kirubaharan, C.,Yoo, D.J.,Kim, A.R. Pergamon Press ; Elsevier Science Ltd 2016 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.41 No.30
<P>The ternary composite comprising reduced graphene oxide (rGO), poly(3,4-ethylenedioxythiophene) (PEDOT) and iron oxide (Fe3O4) nanorods is developed and its substantial contribution toward the green energy generation of air cathode microbial fuel cells (ACMFC) as an efficient oxygen reduction reaction (ORR) catalyst is evaluated by using the different electrochemical techniques under various regimes and conditions. The effectual distribution of needle like and cubic inverse spinel structured Fe3O4 nanorods over the PEDOT enveloped graphene sheets are elucidated from the electron micrographs and the growth and composite formation mechanisms of Fe3O4 and rGO/PEDOT/Fe3O4, respectively, are enunciated from the detailed structural characterizations. The extended surface area, high electrical conductivity, and large oxygen adsorption sites of rGO/PEDOT/Fe3O4 nanocomposite facilitate the excellent ORR kinetics, which yields the maximum ACMFC power density with the superior durability of more than 600 h. Thus the proposed strategy extends a new approach in bringing the advantages of active carbon, conductive polymer and nanomaterials in a single tool, which constructs the prepared ternary composite as a potential ORR contender to the commercially available catalysts. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>
Tribochemistry of contact interfaces of nanocrystalline molybdenum carbide films
Kumar, D. Dinesh,Kumar, N.,Panda, Kalpataru,Kamalan Kirubaharan, A.M.,Kuppusami, P. Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.447 No.-
<P><B>Abstract</B></P> <P>Transition metal carbides (TMC) are known for their improved tribological properties and are sensitive to the tribo-atmospheric environment. Nanocrystalline molybdenum carbide (MoC) thin films were deposited by DC magnetron sputtering technique using reactive CH<SUB>4</SUB> gas. The friction and wear resistance properties of MoC thin films were significantly improved in humid-atmospheric condition as compared to high-vacuum tribo-condition. A comprehensive chemical analysis of deformed contact interfaces was carried out by X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX) and Raman spectroscopy. XPS and Raman spectroscopy showed the formation of stable molybdenum-oxide (MoO), molybdenum carbide (MoC) and amorphous carbon (a-C) tribo-phases. Moreover, during the sliding in humid-atmospheric condition, these phases were extensively deposited on the sliding steel ball counter body which significantly protected against undesirable friction and wear.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reactive DC magnetron sputtered cubic phase of nanocrystalline MoC thin films. </LI> <LI> Chemical bonding analysis of MoC films using X-ray photoelectron spectroscopy. </LI> <LI> Tribological properties of MoC films in ambient and high-vacuum tribo-atmospheres. </LI> <LI> Comprehensive tribochemical analysis of contact interfaces. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Friction and wear behavior of nanocrystalline MoC films under atmospheric and high-vacuum conditions.</P> <P>[DISPLAY OMISSION]</P>