Large arrays of PbO2 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 -PbO2, pure -PbO2, and a + 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 -PbO2 were obtained at pH 0.6, while mixed -PbO2 + -PbO2 nanowires were grown at pH 2. Pure –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 1013 wires/m2. Very high aspect ratios were obtained already after 30 min of electrodeposition.
Inguanta, R., Piazza, S., Sunseri, C. (2008). Growth and characterization of ordered PbO2 nanowires arrays. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 155(12), K205-K210 [10.1149/1.2988728].
Growth and characterization of ordered PbO2 nanowires arrays
INGUANTA, Rosalinda;PIAZZA, Salvatore;SUNSERI, Carmelo
2008-01-01
Abstract
Large arrays of PbO2 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 -PbO2, pure -PbO2, and a + 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 -PbO2 were obtained at pH 0.6, while mixed -PbO2 + -PbO2 nanowires were grown at pH 2. Pure –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 1013 wires/m2. Very high aspect ratios were obtained already after 30 min of electrodeposition.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.