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Search Publications by: Kris A. Bertness (Fed)

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Displaying 76 - 100 of 351

Gallium Nitride Nanowire Probe for Near-Field Scanning Microwave Microscopy

January 15, 2014
Author(s)
Joel C. Weber, Paul T. Blanchard, Aric W. Sanders, Atif A. Imtiaz, Thomas M. Wallis, Kevin J. Coakley, Kristine A. Bertness, Pavel Kabos, Norman A. Sanford, Victor M. Bright
We report on the fabrication of a GaN nanowire probe for near-field scanning microwave microscopy. A single nanowire was Pt-bonded to a commercial Si cantilever prior to evaporation of a Ti/Al coating to provide a microwave signal pathway. Testing over a

Isnt it time to get serious about standards?

November 18, 2013
Author(s)
Kristine A. Bertness
Current methods of composition measurement lack the ability to produce consistent results from laboratory to laboratory and across companies. NIST has developed AlGaAs SRMs to make standardization possible, but the standards need to be used. This opinion

Atom probe tomography evaporation behavior of C-axis GaN nanowires: Crystallographic, stoichiometric, and detection efficiency aspects

November 13, 2013
Author(s)
Norman A. Sanford, David R. Diercks, Brian Gorman, R Kirchofer, Kristine A. Bertness, Matthew D. Brubaker
The field evaporation behavior of c-axis GaN nanowires was explored in two different laser-pulsed atom probe tomography (APT) instruments. Transmission electron microscopy imaging before and after atom probe tomography analysis was used to assist in

Analysis of Contact Interfaces for Single GaN Nanowire Devices

November 1, 2013
Author(s)
Andrew M. Herrero, Paul T. Blanchard, Kristine A. Bertness
Single GaN nanowire (NW) devices fabricated on SiO 2 can exhibit a strong degradation after annealing due to the occurrence of void formation at the contact/SiO 2 interface. This void formation can cause cracking and delamination of the metal film, which

Trace water vapor analysis in specialty gases: sensor and spectroscopic approaches

July 1, 2013
Author(s)
Kristine A. Bertness, Mark W. Raynor, Kevin C. Cossel, Florian B. Adler, Jun Ye
The analysis of water vapor impurity is important in a number of specialty gas applications. However the main driver for the development and advancement of trace H 2O analysis techniques has been the microelectronics industry. The International Technology

On the Field Evaporation Behavior of c-axis GaN Nanowires in Laser-Pulsed Atom Probe Tomography

June 26, 2013
Author(s)
Matthew D. Brubaker, Kristine A. Bertness, Norman A. Sanford, Brian Gorman, David R. Diercks, R Kirchofer
GaN has seen use in many applications such as photovoltaics, blue and ultraviolet lasers, and light-emitting diodes with additional research into expanded and new applications. GaN in the form of nanowires present additional possibilities due to their high

Radio-Frequency and DC Electrical Characterization on a Modular MEMS Mechanical Test Platform for Nanomaterials

June 16, 2013
Author(s)
J. J. Brown, Thomas Mitchell (Mitch) Wallis, Pavel Kabos, Kristine A. Bertness, Norman Sanford, Victor Bright
In order to enable radio frequency (RF) data collection from a micromechanical system designed to strain nanomaterials, a coplanar electrical waveguide has been integrated with an actuated microscale stage. RF (100 MHz to 20 GHz) admittance measurements

AlGaAs Composition Standards at NIST

May 30, 2013
Author(s)
Kristine A. Bertness
High-accuracy comparison standards for Al mole fraction x in AlxGa1–xAs have been available at NIST since 2006 via the Standard Reference Material (SRM) program. This extended abstract describes the development history and technology behind these SRMs.

Studies of photoconductivity and FET behavior in examining drift mobility, surface depletion, and transient effects in Si-doped GaN nanowires examined in vacuum and air

May 3, 2013
Author(s)
Norman A. Sanford, Lawrence H. Robins, Paul T. Blanchard, K. Soria, B. Klein, Kristine A. Bertness, John B. Schlager, Aric W. Sanders
Variable intensity photoconductivity (PC) performed under vacuum at 325 nm was used to estimate drift mobility and negative surface charge density sigma for c-axis oriented Si-doped GaN nanowires (NWs). In this approach we assumed that sigma was

Nitro-Aromatic Explosive Sensing Using GaN Nanowire - Titania Nanocluster Hybrids

May 1, 2013
Author(s)
Albert Davydov, Geetha G. Aluri, Abhishek Motayed, Vladimir P. Oleshko, Kristine A. Bertness, Mulpuri V. Rao
A highly sensitive and selective detection of traces of nitro-aromatic explosive compounds by functionalizing gallium nitride (GaN) nanowires with anatase phase titania (titanium dioxide, TiO2) nanoclusters is demonstrated. The ultraviolet light photo

Spatially-Resolved Dopant Characterization with a Scanning Microwave Microscope

March 25, 2013
Author(s)
Thomas M. Wallis, Atif A. Imtiaz, Alexandra E. Curtin, Pavel Kabos, Matthew D. Brubaker, Norman A. Sanford, Kristine A. Bertness
The scanning microwave microscope (SMM) is a tool for spatially-resolved microwave characterization of nanoelectronic materials and devices. The microscope incorporates a sharp, near-field probe, which measures local changes in reflected microwave signals

Gallium Nitride Nanowires for On-Chip Optical Interconnects on Ex-Situ Substrates

January 16, 2013
Author(s)
Matthew D. Brubaker, Paul T. Blanchard, John B. Schlager, Aric W. Sanders, Alexana Roshko, Shannon M. Duff, Jason Gray, Victor M. Bright, Norman A. Sanford, Kristine A. Bertness
In this letter we report on the fabrication, device characteristics, and optical coupling of a two-nanowire device comprising light-emitting diode and photoconductive GaN nanowires. Axial p-n junction GaN nanowires were grown by molecular beam epitaxy

Selective Streptavidin Bioconjugation on Si and SiC nanowires for Biosensor Applications.

January 14, 2013
Author(s)
Elissa H. Williams, John A. Schreifels, Mulpuri V. Rao, Albert Davydov, Vladimir P. Oleshko, Nancy J. Lin, Kristen L. Steffens, Sergiy Krylyuk, Kristine A. Bertness, Amy Manocchi, Yaroslav Koshka
A functionalization method for the specific and selective immobilization of the streptavidin (SA) protein on semiconductor nanowires (NWs) was developed. Silicon (Si) and silicon carbide (SiC) NWs were functionalized with 3-aminopropyltriethoxysilane