Publications

Displaying 51 - 75 of 171

A Universal Approach to Electrically Connecting Nanowire Arrays Using Nanoparticles Application to a Novel Gas Sensor Architecture

August 14, 2006

Author(s)

Prahalad M. Parthangal, Richard E. Cavicchi, Michael R. Zachariah

We report on a novel, in-situ approach toward connecting and electrically contacting vertically aligned nanowire arrays using conductive nanoparticles. The utility of the approach is demonstrated by development of a gas-sensing device employing this nano

New Technique for Visualizing Microboiling Phenomena and Its Application to Water Pulse Heated by a Thin Metal Film

June 1, 2006

Author(s)

C Avedisian, Richard E. Cavicchi, Michael J. Tarlov

This paper presents a new method for photographing fast transient microscale processes with illustration by the liquid-to-vapor phase change process, with illustration by bubble nucleation from pulse-heated thin films immersed in a pool of water. 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

Nanosecond Imaging of Microboiling Behavior on Pulsed-Heated Au Films Modified With Hydrophilic and Hydrophobic Self-Assembled Monolayers

November 8, 2005

Author(s)

K M. Balss, Charles T. Avedisian, Richard E. Cavicchi, Michael J. Tarlov

Fast transient microboiling has been characterized on modified gold microheaters using a novel laser strobe microscopy technique. Microheater surfaces of different hydrophobicity were prepared using self-assembled monolayers of hexadecane thiol

Restructuring of Tungsten Thin Films Into Nanowires and Hollow Square Cross-Section Microducts

November 1, 2005

Author(s)

P. M. Parthangal, Richard E. Cavicchi, Christopher B. Montgomery, Shirley Turner, Michael R. Zachariah

We report on the growth of nanowires and unusual hollow microducts of tungsten by thermal treatment of tungsten films in a RF H2/Ar plasma at temperatures between 550-620 C. Nanowires with diameters of 10-30 nm and lengths between 50-300 nm were formed

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

Calibration of Microhotplate Conductometric Gas Sensors by Non-Linear Multivariate Regression Methods

July 1, 2004

Author(s)

B K. Dable, K S. Booksh, Richard E. Cavicchi, Stephen Semancik

This paper presents the first demonstration of quantitative multicomponent multivariate calibration of microhotplate conductometric sensors for binary and tertiary mixtures of light gases in air. Four element sensors of TiO 2, SnO 2 with a layer of gold

A Microarray Approach for Optimizing Localized Deposition of Carbon Nanotubes Using Microhotplate Arrays

January 1, 2004

Author(s)

C J. Taylor, Richard E. Cavicchi, Christopher B. Montgomery, Shirley Turner

A 340-element array of microhotplates is used to characterize the chemical vapor deposition growth of carbon nanotubes and nanofibers under a variety of process conditions. One dimension of the 17 by 20 element array was used to vary the thickness of a Ni

Micro-Differential Scanning Calorimeter for Combustible Gas Sensing

January 1, 2004

Author(s)

Richard E. Cavicchi, G Poirier, N H. Tea, Muhammad Y. Afridi, David W. Berning, Allen R. Hefner Jr., John S. Suehle, Michael Gaitan, Stephen Semancik, Christopher B. Montgomery

A micron-scale differential scanning calorimeter (mDSC) has been produced on a silicon chip allowing for microscopic differential scanning calorimetry measurements on small samples. The device consists of a suspended rectangular microhotplate with sample

Rapid Identification of CW Agents by Artificial Neural Networks Pruning of Temperature Programmed Microsensor Databases

December 1, 2003

Author(s)

Zvi Boger, Richard E. Cavicchi, Douglas C. Meier, Stephen Semancik

The need for reliable, quick-acting low-cost detectors for chemical warfare (CW) gases is evident, and many sensors systems have been proposed 1,2. Mobile and hand-held battlefield CW sensor systems are already deployed, but their high cost prevents their

Use of Microhotplates in the Controlled Growth and Characterization of Metal Oxides for Chemical Sensing

December 1, 2003

Author(s)

Richard E. Cavicchi, Stephen Semancik, F DiMeo, C J. Taylor

Microhotplates are micromachined platforms with integrated heaters and contact electrodes that can be used as miniature substrates for metal oxide film growth. Fabricated as arrays, they enable efficient combinatorial studies to be performed on a single

Effect of Surface Wettability on Fast Transient Microboiling Behavior

July 22, 2003

Author(s)

O C. Thomas, Richard E. Cavicchi, Michael J. Tarlov

Microboiling events associated with the fast transient heating of a micrometer-scale metallic thin film heater immersed in water have been studied. The effect of surface properties on the microboiling transients was examined by modifying heater surfaces

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