A5017474585- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Advanced Chemical Sensor Technologies
- Semiconductor materials and devices
- Semiconductor materials and interfaces
- Advanced biosensing and bioanalysis techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Microfluidic and Capillary Electrophoresis Applications
- Mechanical Behavior of Composites
- Molecular Junctions and Nanostructures
- Advanced Sensor Technologies Research
- Composite Material Mechanics
- Electrochemical sensors and biosensors
- Neuroscience and Neural Engineering
- nanoparticles nucleation surface interactions
- Protein purification and stability
- Advancements in Semiconductor Devices and Circuit Design
- Mechanical and Optical Resonators
- thermodynamics and calorimetric analyses
- Optical measurement and interference techniques
- Microfluidic and Bio-sensing Technologies
- Metal and Thin Film Mechanics
- Carbon Nanotubes in Composites
- Thermal Radiation and Cooling Technologies
- Nanotechnology research and applications
National Institute of Standards and Technology
2006-2023
Material Measurement Laboratory
2002-2023
University of Illinois Urbana-Champaign
2018-2022
National Institute of Standards
2019-2021
Large Synoptic Survey Telescope Corporation
2019
Directed Vapor Technologies (United States)
2009
United States Naval Research Laboratory
2009
Texas Instruments (United States)
2002-2008
Information Technology Laboratory
2007
Science Applications International Corporation (United States)
1998
We have sought to enhance the sensitivity of conductometric gas microsensors through design and fabrication porous, three-dimensional tin oxide nanoparticle structures. Electrostatically controlled layer-by-layer processing in aqueous solutions was used decorate sacrificial latex microspheres with Sb:SnO2 nanoparticles. To evaluate their sensing performance, these structures were then deposited as films, via micropipetting, on MEMS micro-hot-plate platforms interdigitated electrodes. Prior...
A monolithic CMOS microhotplate-based conductance-type gas sensor system is described. bulk micromachining technique used to create suspended microhotplate structures that serve as sensing film platforms. The thermal properties of the microhotplates include a 1-ms time constant and 10/spl deg/C/mW efficiency. polysilicon for heater exhibits temperature coefficient resistance 1.067/spl times/10/sup -3///spl deg/C. Tin(IV) oxide titanium(IV) (SnO/sub 2/,TiO/sub 2/) films are grown over...
We have determined the parameters necessary to fabricate reproducible neuronal patterns which we are using begin studying fundamental issues in developmental neurobiology. The addition of a beam homogenizer, as well new surface preparation, has enabled routine production reproducible, high-resolution (2−20 μm) organosilane patterns. effects preparation and dosage were monitored X-ray photoelectron spectroscopy (XPS) proof patterning is provided by imaging XPS. also report guidance adhesion...
We evaluated a microelectromechanical systems (MEMS) microsensor array with temperature-controlled chemi-resistive elements for use as noninvasive clinical diagnostic tool to detect the presence or absence of trace amounts disease biomarkers in simulated breath samples. The environment was periodically altered between air (78% N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , 21% O by volume, 20% relative humidity) and (77% 16% 4% CO...
MOF-coated NHA plasmonic gas sensor with high sensitivity and temperature-induced analyte discrimination.
We investigated multilayer and bilayer Ni/Si thin films by nanodifferential scanning calorimetry (nano-DSC) at ultrarapid scan rates, in a temperature-time regime not accessible with conventional apparatus. DSC experiments were completed slower rates as well, where it was possible to conduct parallel rapid thermal annealing for comparison. Postexperimental characterization accomplished x-ray diffraction, transmission electron microscopy (TEM) energy-filtered TEM of cross sections prepared...
A novel nickel self-aligned silicide (SALICIDE) process technology has been developed for CMOS devices with physical gate length of sub-40 nm. The excess silicidation problem due to edge effect is effectively solved by using a low-temperature, in-situ formed Ni-rich silicide. With this new process, poly prevented. Island diode leakage current and breakdown voltage are also improved.
In this paper we describe a novel long-term microhotplate temperature sensor calibration technique suitable for Built-In Self Test (BIST). The thermal resistance (thermal efficiency) and the voltage from an integrated platinum-rhodium thermocouple were calibrated against freshly four-wire polysilicon microhotplate-heater (heater) that is not stable over long periods of time when exposed to higher temperatures. To stress microhotplate, its was raised around 400 °C held there days. heater then...
Development of technologies for rapid screening DNA secondary structure thermal stability and the effects on binding small molecule drugs is important to drug discovery process. In this report, we describe capabilities an electrochemical, microdevice-based approach determining melting temperatures (Tm) electrode-bound duplex structures. We also highlight new features technology that are compatible with array development adaptation high-throughput screening. As a foundational study exhibit...
In this letter, we describe a novel long-term microhotplate temperature-sensor calibration technique suitable for built-in self-test (BIST). The thermal resistance (thermal efficiency) and the voltage from an integrated platinum/rhodium thermocouple were calibrated against polysilicon curve which drifts over time. Both of these temperature sensors, cannot be directly calibrated, exhibit excellent stability are appropriate BIST functionality.
Previously, we showed within a sub-micron fin shape heterojunction, as current density increases, the non-radiative Auger recombination saturates mediated by extension of depletion region into fin, resulting in droop-free behavior. Here, investigate dependence aspect ratio (height to width ratio) on external quantum efficiency (EQE) single n-AlGaN fin/p-GaN heterojunctions. Fins are arranged an array format varying from 3000 200 nm. In this architecture, n-metal contact is interfaced with...