Feliciano, Jennie

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    Novel synthesis and characterization of metal nanometric wires and anodic alumina membrane-palladium wire ensembles using solid state reduction for hydrogen sensing applications
    (2012) Feliciano, Jennie; Martínez Iñesta, María M.; College of Engineering; Vega Olivencia, Carmen A.; Suleiman Rosado, David; Department of Chemical Engineering; Perales Pérez, Oscar
    In the last decade nanowires (NWs) have become the focus of intensive research in the areas of catalysis, sensors, gas storage, among others. These ordered high surface area materials display high chemical reactivity because of their unusual physical and chemical properties. Metal nanowires (MNWs) are likely to become an integral part of future nanodevices, at least as the elements interconnecting the functional components such as ‘nano’-transistors. One possible application of palladium (Pd) and Pd alloyed NWs that is of interest to NASA is their study as active components for hydrogen (H2) sensors to form smaller sensors with better response. In this thesis a novel method via solid state reduction (SSR) is presented for the fabrication of regular and uniform arrays of metal nanometric wires using anodic alumina membrane (AAM) as template. This method was successful in the fabrication of copper (Cu), silver (Ag), palladium (Pd), and platinum (Pt) nanometric wires. Nickel (Ni) nanotubes were also satisfactorily synthesized using this method. It was observed that different metalsprecursors used at the same metal molar concentration have an effect in the diameter of the wires. It was also observed that higher metal concentrations increased the diameter of the wires. This technique, in comparison with existing ones, has shown to be fast, easy, safe, versatile and reliable to obtain metal nanometric wires. This technique requires less equipment, and can be useful for industrial manufacture of metal nanometric wires. The Pd nanometric wires synthesized via SSR in the AAM template were studied as H2 sensing device at room temperature. The AAM-Pd based device showed a reversible response to H2 concentration and the electrical resistance increased linearly with the H2 concentration. AAM-Pd nanometric wires ensembles with a Pd loading of 2.5%, 5%, and 10% were prepared to study the effect of Pd concentration sensing H2. The AAM-Pd nanometric wires ensemble with 5% Pd loading responded faster after hydrogen adsorption than the other ensembles. Also, it showed a better sensitivity and was more stable for H2 sensing than the others.