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Search Publications

NIST Authors in Bold

Displaying 35551 - 35575 of 73697

Optical Bandgaps and Composition Dependence of Hafnium Aluminate Thin Films grown by Atomic Layer Chemical Vapor Deposition

November 17, 2005
Author(s)
Nhan V. Nguyen, Safak Sayan, Igor Levin, James R. Ehrstein, I.J.R. Baumvol, C. Driemeier, L Wielunski, Pui-Yee Hung, Alain C. Diebold
Hafnium-aluminate (HfAlO) films grown on Si by Atomic Layer Chemical Vapor Deposition (ALCVD) of different aluminum contents were investigated in this article. Vacuum Ultra-Violet Spectroscopic Ellipsometry (VUV-SE), high Resolution Transmission Electron

Wire Bonding Process Monitoring using Thermopile Temperature Sensor

November 17, 2005
Author(s)
Suman Shivesh, Michael Gaitan, Joshi Yogendra, George G. Harman
This work presents an approach to separate the thermal response due to ultrasonic excitation and ball deformation through a novel application of aluminum-polysilicon thermopile sensors under the bond pad. These integrated thermopile sensors measure

Decoherence in Josephson Qubits from Dielectric Loss

November 16, 2005
Author(s)
John M. Martinis, Ken B. Cooper, Robert Mcdermott, Matthias Steffen, Markus Ansmann, Kevin Osborn, Katarina Cicak, Seongshik Oh, David P. Pappas, Raymond Simmonds, Clare Yu
Dielectric loss from two-level states is shown to be a dominant decoherence source in superconducting quantum bits. Depending on the qubit design, dielectric loss from insulating materials or the tunnel junction can lead to short coherence times. We show

Gold Superfill in Sub-Micrometer Trenches: Experiment and Prediction

November 16, 2005
Author(s)
Daniel Josell, Daniel Wheeler, Thomas P. Moffat
Bottom-up deposition of gold in fine trenches, also called superfill, was recently demonstrated using a submonolayer coverage of preadsorbed, deposition-rate-accelerating lead followed by gold electrodeposition. The present study has used experiments on

Variations in Semiconducting Polymer Microstructure and Hole Mobility With Spin-Coating Speed

November 15, 2005
Author(s)
Dean M. DeLongchamp, Brandon M. Vogel, Youngsuk Jung, Curt A. Richter, Oleg A. Kirillov, Jan Obrzut, Daniel A. Fischer, S Sambasivan, Marc Gurau, Lee J. Richter, Eric K. Lin
Organic semiconductors permit low-cost processing methods such as spin-coating, dip coating, or ink-jet printing onto flexible substrates. However, the performance of these materials in devices is difficult to control and new processing methods can deliver

Carbon nanotube coated thermal detectors

November 14, 2005
Author(s)
John H. Lehman
Nearly all of the radiometric standards for laser power and energy measurements at NIST and elsewhere in the world are based on thermal detectors. These detectors usually rely on a thermal absorber coating to enhance the detector responsivity. Ideally the

Dielectric function of carbon nanotube coated thermal detectors

November 14, 2005
Author(s)
John H. Lehman
The absolute responsivity of a thermal detector depends on its absorption efficiency as a function of wavelength. We present experiments and document the results for carbon nanotube (CNT) based coatings for thermal detectors. The results indicate that the

Ultraviolet Laser Damage of Carbon Nanotube Coatings on Thermal Detector Platforms

November 14, 2005
Author(s)
Darryl A. Keenan, Natalia Varaksa, Anne Dillon, Chaiwat Engtrakul, Stephen E. Russek, John H. Lehman
We have initiated a program to demonstrate the next generation of optical detector coatings using carbon nanotubes (CNTs). These coatings have been used on a variety of detector platforms for laser power and energy measurement standards. These coatings

Characterization of Atomic Layer Deposition Using X-Ray Reflectrometry

November 13, 2005
Author(s)
Donald A. Windover, N G. Armstrong, James P. Cline, P Y. Hung, A C. Diebold
This work addresses current limitations of X-ray reflectometry (XRR) for modeling thin films and provides a basis for their improvement. Better accuracy in the characterization of novel thin film structures requires better model selection techniques and

Ignition of Vegetation and Mulch by Firebrands in Wildland/Urban Interface (WUI) Fires.

November 13, 2005
Author(s)
Samuel L. Manzello, Thomas G. Cleary, John R. Shields, Jiann C. Yang
Firebrands or embers are produced as trees and structures burn in wildland/urban interface (WUI) fires. Hot firebrands ultimately come to rest and may ignite fuels far removed from the fire, resulting in fire spread. It is believed that firebrand showers

Use of Visual Imagery for the NIST World Trade Center Investigation

November 13, 2005
Author(s)
William M. Pitts, Kathryn M. Butler, Valentine Junker
The attack on the World Trade Center (WTC) in New York City on September 11, 2001 by terrorists flying hijacked commercial aircraft into the two towers (WTC 1 and WTC 2) was among the worst building disasters in the history of the United States. In

Design and Modeling of Thermally Actuated MEMS Nanopositioners

November 11, 2005
Author(s)
Sebastien Bergna, Jason J. Gorman, Nicholas G. Dagalakis
Several micro-scale nanopositioning mechanisms, or MEMS nanopositioners, have been developed for application in nanotechnology and optical sensors. In this paper, the design and modeling of these devices is presented along with initial experimental results
Displaying 35551 - 35575 of 73697
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