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RESEARCH PRODUCT
Growth and Characterization of Ordered PbO[sub 2] Nanowire Arrays
Rosalinda InguantaCarmelo SunseriSalvatore Piazzasubject
Materials scienceRenewable Energy Sustainability and the EnvironmentNanowireAnalytical chemistryLead dioxideNanotechnologyCrystal structureElectrolyteCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsAnodeElectrochemical deposition Anodic alumina membranes Lead dioxide Nanowireschemistry.chemical_compoundSettore ING-IND/23 - Chimica Fisica ApplicatachemistryNitric acidMaterials ChemistryElectrochemistryVapor–liquid–solid methodPolarization (electrochemistry)description
Large arrays of PbO 2 nanowires having high aspect ratios (length-to-width ratio) were grown by potentiostatic electrodeposition into anodic alumina templates under anodic polarization. Different electrolytic solutions were used in order to obtain nanowires of pure α-PbO 2 , pure β-PbO 2 , and a a + β mixture, We have found that, in a lead nitrate bath, a crystallographic structure of nanowires depends on pH; this latter was varied adding diluted nitric acid to the electrolyte. Nanowires of pure β-PbO 2 were obtained at pH 0.6, while mixed α-PbO 2 + β-PbΟ 2 nanowires were grown at pH 2. Pure α-phase was obtained in a bath containing lead acetate at pH 6.6. In all deposition conditions, nanowires present the same morphology: perfectly cylindrical wires having uniform diameters throughout length, with an average value of ∼210 nm and a population density on the order of 10 13 wires/m 2 . Very high aspect ratios were obtained already after 30 min of electrodeposition.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-01-01 | Journal of The Electrochemical Society |