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Search Publications by: Steve Semancik (Fed)

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Displaying 26 - 50 of 213

The I/O transform of a chemical sensor

March 14, 2016
Author(s)
Nalin Katta, Douglas C. Meier, Kurt D. Benkstein, Stephen Semancik, Baranidharan Raman
A number of sensing technologies using a variety of transduction principles have been proposed for the purpose of non-invasive chemical sensing. A fundamental problem common to all sensing technologies is determining what features of the transducer's

Gas Sensing with Bare and Graphene-covered Optical Nano Antenna Structures

February 17, 2016
Author(s)
Bhaven Mehta, Kurt D. Benkstein, Stephen Semancik, Mona E. Zaghloul
The motivation behind this work is to study the gas phase chemical sensing characteristics of optical (plasmonic) nano antennas (ONA) and graphene/graphene oxide-covered versions of these structures. ONA are devices that have their resonating frequency in

Rapid DNA melting analyses using a microfabricated electrochemical platform

January 1, 2015
Author(s)
Zuliang Shen, Stephen Semancik, Herman O. Sintim
A new microscale platform is reported which is based on microfabrication methods that integrate thermal control and multi-electrode components to enable rapid temperature-dependent electrochemical measurements on small volume fluid samples. We demonstrate

A Demonstration of Fast and Accurate Discrimination and Quantification of Chemically Similar Species Utilizing a Single Cross-Selective Chemiresistor

June 14, 2014
Author(s)
Alexander (. Vergara Tinoco, Kurt D. Benkstein, Christopher B. Montgomery, Stephen Semancik
Performance characteristics of gas-phase microsensors will determine the ultimate utility of these devices for a wide range of chemical monitoring applications. Considerable effort has led to electronic nose devices that utilize multiple cross-selective

Microsensors for Mars: Trace Analyte Detection in a Simulated Martian Environment

May 23, 2014
Author(s)
Kurt D. Benkstein, Phillip H. Rogers, Christopher B. Montgomery, C. Jin, Baranidharan Raman, Stephen Semancik
Chemiresistive microsensor arrays are being developed and tested in a simulated Martian environment. Target analyte species include trace small molecules that may indicate current geological or, potentially, biological activity on Mars. The sensing films

Nanomaterials-Enabled Photonic and Chemiresistive Sensing of Chemicals and Biochemicals

May 12, 2014
Author(s)
Charles J. Choi, Kurt D. Benkstein, Phillip H. Rogers, Christopher B. Montgomery, Stephen Semancik
Contact events occurring between target species and surface sites on sensing materials initiate front-end interactions and subsequent transduction processes that can yield viable signals for target detection. By offering high surface-to-volume ratios, and

Analytical Capabilities of Chemiresistive Microsensor Arrays in a Simulated Martian Atmosphere

March 6, 2014
Author(s)
Kurt D. Benkstein, Phillip H. Rogers, Christopher B. Montgomery, Jerry Jin, Baranidharan Raman, Stephen Semancik
The capabilities of a chemiresistive microsensor array for detecting and identifying four trace target analytes were examined under a simulated Martian atmosphere. The simulated environment included low oxygen content (0.15 %) balanced by carbon dioxide

Microsensor Analyses for Trace Targets over Extended Times in a Simulated Martian Environment

November 6, 2013
Author(s)
Kurt D. Benkstein, Phillip H. Rogers, Christopher B. Montgomery, Stephen Semancik, C. Jin, Baranidharan Raman
We have studied the performance of a chemical microsensor array in a simulated Martian environment, which involved a carbon dioxide-rich background with low oxygen content (0.15 %) at low pressure and temperature to mimic the conditions at the Martian