Erik H. Hároz

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Fluorescence has been observed directly across the band gap of semiconducting carbon nanotubes. We obtained individual nanotubes, each encased in a cylindrical micelle, by ultrasonically agitating an aqueous dispersion of raw single-walled carbon nanotubes in sodium dodecyl sulfate and then centrifuging to remove tube bundles, ropes, and residual catalyst.(More)
The ionic surfactant-assisted dispersion of single-walled carbon nanotubes in aqueous solution has been studied by Raman and fluorescent spectroscopy during ultrasonic processing. During the process, an equilibrium is established between free individuals and aggregates or bundles that limits the concentration of the former that is possible. This equilibrium(More)
Raman spectroscopy performed between 565 and 627 nm and also between 458and 514.5-nm laser excitation was used to map the lowestenergy van Hove singularities of metallic single-walled carbon nanotubes suspended in aqueous solution using sodium dodecyl sulfate. The interband transitions of distinct metallic nanotubes were observed directly and assigned using(More)
Plasmon resonance is expected to occur in metallic and doped semiconducting carbon nanotubes in the terahertz frequency range, but its convincing identification has so far been elusive. The origin of the terahertz conductivity peak commonly observed for carbon nanotube ensembles remains controversial. Here we present results of optical, terahertz, and(More)
Capillary electrophoresis (CE) has been performed on polymer-stabilized bundles and sodium dodecyl sulfate (SDS) suspensions of high-pressure carbon monoxide (HiPco)-produced single-walled carbon nanotubes. Realtime Raman spectroscopy has been used for detection and characterization of the separation process. Radialbreathing-mode vibrational frequencies are(More)
G. D. Sanders,1 C. J. Stanton,1 J.-H. Kim,2 K.-J. Yee,2 Y.-S. Lim,3 E. H. Hároz,4 L. G. Booshehri,4 J. Kono,4 and R. Saito5 1Department of Physics, University of Florida, Box 118440, Gainesville, Florida 32611-8440, USA 2Department of Physics, Chungnam National University, Daejeon 305-764, Republic of Korea 3Department of Applied Physics, Konkuk University,(More)
Single-wall carbon nanotubes provide ideal model one-dimensional (1-D) condensed matter systems in which to address fundamental questions in many-body physics, while, at the same time, they are leading candidates for building blocks in nanoscale optoelectronic circuits. Much attention has been recently paid to their optical properties, arising from 1-D(More)
L. G. Booshehri,1,2 C. L. Pint,2,3,4 G. D. Sanders,5 L. Ren,1,2 C. Sun,1,2 E. H. Hároz,1,2 J.-H. Kim,6 K.-J. Yee,6 Y.-S. Lim,7 R. H. Hauge,2,4 C. J. Stanton,5 and J. Kono1,2,3,* 1Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA 2The Richard E. Smalley Institute for Nanoscale Science and Technology, Rice(More)
In acidic solution between pH 6 and 2.5, protons react reversibly and selectively in the presence of preadsorbed oxygen at the sidewall of aqueous dispersed single-walled carbon nanotubes suspended in sodium dodecyl sulfate. This reactive complex, which protonates the nanotube sidewall, reversibly diminishes absorption intensity, fluorescent emission, and(More)
A scalable and facile approach is demonstrated where as-grown patterns of well-aligned structures composed of single-walled carbon nanotubes (SWNT) synthesized via water-assisted chemical vapor deposition (CVD) can be transferred, or printed, to any host surface in a single dry, room-temperature step using the growth substrate as a stamp. We demonstrate(More)