Electrochemical oxidation and reduction were utilized to modify vertically aligned carbon nanotube (CNT) arrays grown on a porous network of conductive carbon microfibers. Ultrafast and complete CNT opening and purification were achieved through electrochemical oxidation. Highly dispersed platinum nanoparticles were then uniformly and densely deposited as electrocatalysts onto the surface of these CNTs through electrochemical reduction. Using supercritical drying techniques, we demonstrate that the unidirectionally aligned and laterally spaced geometry of the CNT arrays can be fully retained after being subjected to each step of electrochemical modification. The open-tipped CNTs can also be electrochemically detached in full lengths from the supporting substrates and harvested if needed.
Two IR flash kinetic spectrometers are described. Both use nanosecond pulsed UV lasers to produce high concentrations of reactive species. These are then probed by tunable cw IR lasers. High-resolution spectra of singlet and triplet states of CH2 and of HCO are presented. Measurements of reaction rates and of product quantum yields are described for several reactions important in atmospheric and combustion chemistry with particular emphasis on the dynamics of radical-radical reactions. The reactivity of the coordinatively unsaturated organometallic intermediate cyclopentadienylcobaltmonocarbonyl (CpCoCO) to a variety of ligands is studied in both gas and liquid phases.
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