title: Fabrication and electrocatalysis of self-assembly directed gold nanoparticles anchored carbon nanotubes modified electrode.
abstract: A self-assembly directed approach was adopted to modify glassy carbon electrode (GC) with gold nanoparticles incorporation and the electrocatalytic performance of self-assembly modified electrode, GC/SA-Au-ME was critically evaluated for the oxidation of ascorbic acid (AA). The modification involves the dispersion of multi-wall carbon nanotube (MWNT) and an inclusion complex, beta-cyclodextrin-4-aminothiophenol on the surface of GC electrode in the presence of cetyltrimethylammonium bromide (CTAB). Gold nanoparticles were deposited into the self-assembled sites to fabricate the modified electrode, GC/SA-Au-ME. Another electrode (GC-Au-ME) was fabricated under similar conditions in the absence of CTAB. The electrocatalytic activity of the modified electrodes (GC/SA-Au-ME and GC-Au-ME) towards the oxidation of AA was critically compared. Cyclic voltammetry, chronoamperometry, and double potential chronoamperometry were used to evaluate the characteristics of the modified electrodes. The self-assembled electrode (GC/SA-Au-ME) shows excellent electrocatalytic activity over the other electrode, GC-Au-ME. Augmented current response, faster electron transfer kinetics (with a rate constant for electron transfer process as 3.25 x 10(4) cm3 mol(-1) s(-1)), linear range of response for the analyte (1-50 mM with an extended detection limit to 1 microM), better sensitivity, and selectivity were witnessed for the self-assembly directed modified electrode.
authors.affiliation: Department of Chemistry Graduate School, Kyungpook National University, Daegu 702-701, South Korea.
authors.forename: Kwang-Pill
authors.initials: KP
authors.lastname: Lee
authors.forename: Anantha Iyengar
authors.initials: AI
authors.lastname: Gopalan
authors.forename: Padmanabhan
authors.initials: P
authors.lastname: Santhosh
authors.forename: Kalayil Manian
authors.initials: KM
authors.lastname: Manesh
authors.forename: Jun Heon
authors.initials: JH
authors.lastname: Kim
authors.forename: Kyu Soo
authors.initials: KS
authors.lastname: Kim
mesh_terms: D002384:Catalysis; D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D004563:Electrochemistry; D004566:Electrodes; D006046:Gold; D049329:Nanostructures; D036103:Nanotechnology; D037742:Nanotubes, Carbon / Q000737:chemistry*
chemical_list: D002593:Cetrimonium Compounds; D020099:Coated Materials, Biocompatible; D037742:Nanotubes, Carbon; D006046:Gold; D000077286:Cetrimonium