U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Steve Semancik (Fed)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 151 - 175 of 213

Chemical Crosstalk Between Heated Gas Microsensor Elements Operating in Close Proximity

June 1, 2001
Author(s)
M C. Wheeler, J E. Tiffany, R M. Walton, Richard E. Cavicchi, Stephen Semancik
Gas microsensor arrays often have closely-spaced elements typically separated by hundreds of microns. For such devices, crosstalk between elements operated within a gaseous environment is a concern because sensing materials held at elevated temperatures

Microhotplate Platforms for Chemical Sensor Research

June 1, 2001
Author(s)
Stephen Semancik, Richard E. Cavicchi, M C. Wheeler, J E. Tiffany, G Poirier, R M. Walton, John S. Suehle, B. Panchapakesan, D. E. DeVoe
This paper describes the development and use of microdevices and microarrays in chemical sensor research. The surface-micromachined microhotplate structure common within the various platforms included here was originally designed for fabricating

Using Chemical Kinetic Effects for Understanding and Developing Chemical Sensors

February 1, 2000
Author(s)
M C. Wheeler, Richard E. Cavicchi, G Poirier, Stephen Semancik
While conductometric gas sensing has been widely studied, the mechanisms are not well understood (particularly for modified oxides). For example, what magnitude of conductance change occurs for a given coverage of adsorbed analyte? We are using specially

Microhotplate Gas Sensor Arrays

November 18, 1999
Author(s)
Richard E. Cavicchi, Stephen Semancik, R M. Walton, B Panchapakesan, Don L. DeVoe, M I. Aquino-Class, J D. Allen, John S. Suehle
In this work, micromachining and planar processing has been used to achieve solid state sensing devices with lower power consumption at lower cost. The small size brings new advantages for chemical selectivity as well: multi-element whose time-varying

Property-Performance Studies of SnO 2 Sensing Films Using Micromachined Arrays

February 22, 1999
Author(s)
R M. Walton, Richard E. Cavicchi, Stephen Semancik
The microstructure and composition of sensing materials profoundly affect the performance of solid state gas sensors. We report property/performance relationships of conductometric gas sensing films deposited on micromachined devices called microhotplates