A5016807370- Carbon Nanotubes in Composites
- Graphene research and applications
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- Superconducting and THz Device Technology
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Advanced biosensing and bioanalysis techniques
- Nanopore and Nanochannel Transport Studies
- Mitochondrial Function and Pathology
- Semiconductor Quantum Structures and Devices
- Advancements in Semiconductor Devices and Circuit Design
- Nanotechnology research and applications
- Mechanical and Optical Resonators
- Radio Frequency Integrated Circuit Design
- Plasmonic and Surface Plasmon Research
- Semiconductor materials and devices
- Terahertz technology and applications
- Neuroscience and Neural Engineering
- Microfluidic and Bio-sensing Technologies
- Electrochemical sensors and biosensors
- Acoustic Wave Resonator Technologies
- Graphene and Nanomaterials Applications
- Photonic and Optical Devices
- Electrochemical Analysis and Applications
University of California, Irvine
2014-2023
Irvine University
2004-2023
University of California System
2004-2014
UC Irvine Health
2014
Sunchon National University
2010
General Dynamics (United Kingdom)
2009
Samueli Institute
2004-2009
California Institute of Technology
2000-2003
Yale University
1995-1999
Advanced Micro Devices (United States)
1995
Presents a technique to directly excite Luttinger liquid collective modes in carbon nanotubes at gigahertz frequencies. By modeling the nanotube as nano-transmission line with distributed kinetic and magnetic inductance well quantum electrostatic capacitance, we calculate complex frequency-dependent impedance for variety of measurement geometries. Exciting voltage waves on is equivalent exciting yet-to-be observed one-dimensional plasmons, low energy excitation liquid. Our has already been...
We develop an RF circuit model for single walled carbon nanotubes both dc and capacitively contacted geometries. By modeling the nanotube as a nanotransmission line with distributed kinetic magnetic inductance well quantum electrostatic capacitance, we calculate complex, frequency dependent impedance variety of measurement Exciting voltage waves on is equivalent to directly exciting yet-to-be observed one dimensional plasmons, low energy excitation Luttinger liquid.
We present quantitative predictions of the performance nanotubes and nanowires as antennas, including radiation resistance, input reactance antenna efficiency, a function frequency nanotube length. Particular attention is paid to quantum capacitance kinetic inductance. develop models for both far-field patterns well near-field antenna-to-antenna coupling. In so doing, we also circuit model transmission line made two parallel nanotubes, which has applications nanointerconnect technology....
Using about 600 college students and exploratory confirmatory factor analysis, three models of personality structure were tested: the Big Five, as measured by NEO Personality Inventory (P.T. Costa & R. McCrae, 1985), A. Tellegen's (1985) three- four-dimensional models, Multidimensional Questionnaire (A. Tellegen, 1982). Both methods indicated considerable support for, but also some divergences from, models. We concluded that parsimonious are unlikely to meet conventional goodness-of-fit...
Double-quantum-well field-effect transistors with a grating gate exhibit sharply resonant, voltage tuned terahertz photoconductivity. The resonance is determined by the plasma oscillations of composite structure. resonant photoconductivity requires double-quantum well but mechanism whereby produce changes in device conductance not understood. phenomenon potentially important for fast, tunable detectors.
We present the first demonstration of single-walled carbon nanotube transistor operation at microwave frequencies. To measure source-drain ac current and voltage frequencies, we construct a resonant LC impedance-matching circuit 2.6 GHz. Both semiconducting metallic nanotubes are measured. Varying back-gate for dc varies 2.6-GHz impedance. In contrast, varying on has no effect find impedance to be different than resistance, which may due distributed nature capacitive inductive contacts nanotube.
Centimeter scale aligned carbon nanotube arrays are grown from nanoparticle/metal catalyst pads. We find the nanotubes grow both "with" and "against wind". A metal underlayer provides in situ electrical contact to these long with no post growth processing needed. Using electrically contacted nanotubes, we study transport of 0.4 cm nanotubes. The source−drain I−V curves quantitatively described by a classical, diffusive model. Our measurements show that outstanding properties can be extended...
Detailed measurements of the voltage, temperature, and frequency dependence nonequilibrium current fluctuations for a diffusive mesoscopic conductor are reported. The data confirm predictions that shorter than electron-electron inelastic length will display shot noise. Furthermore, low temperatures (100 mK) high frequencies (1--20 GHz) used allow tests in high-frequency regime (i.e., $h\ensuremath{\nu}\ensuremath{\gg}\mathrm{eV}$ $\mathrm{kT}$) noise, which clearly show influence vacuum...
We measure the real and imaginary conductivity σ(k=0,ω) of a high-mobility two-dimensional electron gas (2DEG) system at frequencies below above momentum scattering rate. The part 2DEG impedance is observed to be inductive, consistent with Drude model. Using this kinetic inductance, we construct transmission line by capacitively coupling an Al Schottky barrier gate separated 5000 Å from 2DEG. measured wave velocity temperature-dependent damping are in good agreement simple Exciting these...
Here we report experimental results for a carbon nanotube (CNT) based amplitude-modulated (AM) demodulator modulation frequencies up to 100 kHz. Further, the CNT was successfully demonstrated in an actual AM radio receiver operating at carrier frequency of 1 GHz and capable demodulating high-fidelity audio. The demodulation originates from nonlinear current−voltage (IDS vs VDS) characteristic CNT, which induces rectification portion applied RF signal. By properly biasing such that point is...
High mobility and high on/off ratio thin-film transistors are fabricated using solution-based deposition of purified semiconducting carbon nanotubes. A comprehensive spectrum the density starting from less than 10 tubes μm−2 to end around 100 is investigated. This study provides first important roadmap for tradeoffs between in nanotube-based inks. Detailed facts importance specialist readers published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset....
We present an open source, fully wireless potentiostat (the “NanoStat”) for applications in electrochemistry, sensing, biomedical diagnostics, and nanotechnology, based on only 2 integrated circuit chips: A digital microcontroller with board WiFi file/web server hardware/software, analog front end. This versatile platform is capable of all modern electrochemisty assays, including cyclic voltammetry, square wave chronoamperometry, normal pulse voltammetry. The user interface a web browser...
The dynamical conductance of electrically contacted single-walled carbon nanotubes is measured from dc to 10 GHz as a function source−drain voltage in both the low-field and high-field limits. ac nanotube itself found be equal over frequency range studied for tubes ballistic diffusive limit. This clearly demonstrates that can carry high-frequency currents at least well wide operating conditions. Although detailed theoretical explanation still lacking, we present phenomenological model...