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in creator/contributor: "Casalnuovo, Stephen A."  
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Gas Phase Chemical Detection with an Integrated Chemical Analysis System

Description: Microfabrication technology has been applied to the development of a miniature, multi-channel gas phase chemical laboratory that provides fast response, small size, and enhanced versatility and chemical discrimination. Each analysis channel includes a sample concentrator followed by a gas chromatographic separator and a chemically selective surface acoustic wave detector array to achieve high sensitivity and selectivity. The performance of the components, individually and collectively, is descr… more
Date: July 8, 1999
Creator: Baca, Albert G.; Casalnuovo, Stephen A.; Frye-Mason, Gregory C.; Heller, Edwin J.; Hietala, Susan L.; Hietala, Vincent M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Microfabricated Gas Phase Chemical Analysis Systems

Description: A portable, autonomous, hand-held chemical laboratory ({mu}ChemLab{trademark}) is being developed for trace detection (ppb) of chemical warfare (CW) agents and explosives in real-world environments containing high concentrations of interfering compounds. Microfabrication is utilized to provide miniature, low-power components that are characterized by rapid, sensitive and selective response. Sensitivity and selectivity are enhanced using two parallel analysis channels, each containing the sequen… more
Date: August 2, 1999
Creator: Casalnuovo, Stephen A.; Frye-Mason, Gregory C; Heller, Edwin J.; Hietala, Vincent M.; Kottenstette, Richard J.; Lewis, Patrick R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gas phase chemical detection with an integrated chemical analysis system

Description: Microfabrication technology has been applied to the development of a miniature, multi-channel gas phase chemical laboratory that provides fast response, small size, and enhanced versatility and chemical discrimination. Each analysis channel includes a sample preconcentrator followed by a gas chromatographic separator and a chemically selective surface acoustic wave detector array to achieve high sensitivity and selectivity. The performance of the components, individually and collectively, is de… more
Date: April 12, 2000
Creator: Casalnuovo, Stephen A.; Frye-Mason, Gregory Charles; Kottenstette, Richard; Heller, Edwin J.; Matzke, Carolyn M.; Lewis, Patrick R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Monolithic integration of GaAs SAW chemical microsensor arrays and detection electronics

Description: The authors describe the integration of an array of surface acoustic wave delay line chemical sensors with the associated RF microelectronics such that the resulting device operates in a DC in/DC out mode. The microelectronics design for on-chip RF generation and detection is presented. Both hybrid and monolithic approaches are discussed. This approach improves system performance, simplifies packaging and assembly, and significantly reduces overall system size. The array design can be readily s… more
Date: April 17, 2000
Creator: Casalnuovo, Stephen A.; Hietala, Vincent M.; Heller, Edwin J.; Ason, Gregory Charles & Baca, Albert G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Integrated chemiresistor array for small sensor platforms

Description: Chemiresistors are fabricated from materials that change their electrical resistance when exposed to certain chemical species. Composites of soluble polymers with metallic particles have shown remarkable sensitivity to many volatile organic chemicals, depending on the ability of the analyte molecules to swell the polymer matrix. These sensors can be made extremely small (< 100 square microns), operate at ambient temperatures, and require almost no power to read-out. However, the chemiresisto… more
Date: April 13, 2000
Creator: Hughes, Robert C.; Casalnuovo, Stephen A.; Wessendorf, Kurt O.; Savignon, Daniel J.; Hietala, Susan Leslie & Patel, Sanjay V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Acoustic Wave Chemical Microsensors in GaAs

Description: High sensitivity acoustic wave chemical microsensors are being developed on GaAs substrates. These devices take advantage of the piezoelectric properties of GaAs as well as its mature microelectronics fabrication technology and nascent micromachining technology. The design, fabrication, and response of GaAs SAW chemical microsensors are reported. Functional integrated GaAs SAW oscillators, suitable for chemical sensing, have been produced. The integrated oscillator requires 20 mA at 3 VK, opera… more
Date: September 20, 1998
Creator: Baca, Albert G.; Heller, Edwin J.; Frye-Mason, Gregory C.; Reno, John L.; Kottenstette, Richard; Casalnuovo, Stephen A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Monolithic GaAs surface acoustic wave chemical microsensor array

Description: A four-channel surface acoustic wave (SAW) chemical sensor array with associated RF electronics is monolithically integrated onto one GaAs IC. The sensor operates at 690 MHz from an on-chip SAW based oscillator and provides simple DC voltage outputs by using integrated phase detectors. This sensor array represents a significant advance in microsensor technology offering miniaturization, increased chemical selectivity, simplified system assembly, improved sensitivity, and inherent temperature co… more
Date: March 9, 2000
Creator: Hietala, Vincent M.; Casalnuovo, Stephen A.; Heller, Edwin J.; Wendt, Joel R.; Frye-Mason, Gregory Charles & Baca, Albert G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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