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Search Publications by: Steve Semancik (Fed)

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Displaying 76 - 100 of 213

Directed Fabrication of Ceramic Nanostructures on Fragile Substrates Using Soft-Electron Beam Lithography (soft-eBL)

May 1, 2008
Author(s)
Suresh Donthu, Nasim Alem, Zixlao Pan, Shu-you Li, Gajendra Shekhawat, Vinayak Dravid, Kurt D. Benkstein, Stephen Semancik
We demonstrate the use of a facile nanopatterning scheme known as soft-electron beam lithography (soft-eBL) to fabricate and site-specifically position a variety of functional ceramic nanostructures onto fragile substrates: a 75-nm thick electron

Coupling Nanowire Chemiresistors With Microhotplate Platforms for Advanced Gas Sensing

August 6, 2007
Author(s)
Douglas C. Meier, Stephen Semancik, Bradley Button, Eugene Strelcov, Andrei Kilmakov
Recent advances in nanotechnology have yielded new materials and structures that offer great potential for improving sensitivity, selectivity and stability of the next generation of chemical gas sensors. To successfully fabricate practical devices, the

Temperature Measurements of Microhotplates Using Fluorescence Thermometry

March 1, 2006
Author(s)
Christopher W. Meyer, Douglas C. Meier, Christopher B. Montgomery, Stephen Semancik
A fluorescence microscope has been constructed for measuring surface temperatures of microhotplate platforms. The microscope measures temperature-dependent fluorescence lifetimes of a film of the phosphor Mg4(F)GeO6:Mn which is deposited on the

Characterization System for Embedded Gas Sensor Systems-on-a-Chip

December 1, 2005
Author(s)
Muhammad Y. Afridi, Allen R. Hefner Jr., Colleen E. Hood, Richard E. Cavicchi, Stephen Semancik
A characterization system is presented for evaluating critical functions of a microhotplate-based embedded gas-sensor for system-on-a-chip applications. The system uses a virtual instrument interface to control parts-per-billion (ppb) gas concentration

Chemical Warfare Agent Detection Using MEMS Microsensor Arrays

August 1, 2005
Author(s)
Douglas C. Meier, C J. Taylor, Richard E. Cavicchi, Edward White V, M W. Ellzy, K B. Sumpter, Stephen Semancik
Chemical sensors capable of accurate detection of trace quantities of chemical warfare (CW) agents would provide a potent tool for perimeter security, treaty verification, battlefield threat detection, and the protection of civilians in public places

Chemical Warfare Agent Detection Using MEMS-Compatible Microsensor Arrays

August 1, 2005
Author(s)
Douglas C. Meier, C J. Taylor, Richard E. Cavicchi, Edward White, M W. Ellzy, K B. Sumpter, Stephen Semancik
Microsensors have been fabricated consisting of TiO2 and SnO2 sensing films prepared by chemical vapor deposition (CVD) on MEMS- (micro-electromechanical systems) compatible array platforms. Response measurements from these devices to the CW agents GA