Portland State University – TechConnect Briefs

Automated Crystal Orientation and Phase Mapping of Iron Oxide Nano-Crystals in a Transmission Electron Microscope

Rouvimov S., Rauch E.F., Moeck P., Nicolopoulos S., Portland State University, US

An automated technique for the crystal phase and orientation mapping of polycrystalline materials in a TEM has recently beam developed. This technique is based on template matching of experimental electron diffraction spot patterns to their [...]

Structural fingerprinting of nano-crystals based on high resolution transmission electron microscopy imaging: challenges and perspectives

Rouvimov S., Moon B., Moeck P., Portland State University, US

The methods for structure identification and analysis of nanocrystalline particles are in high demand for nanotechnology and nanofabrication, areas that require fast, reliable and robust metrologies for nanometer-sized objects. High-resolution (HR) transmission electron microscopy (TEM) [...]

Quantifying and enforcing the two-dimensional symmetry of scanning probe microscopy images of periodic objects

Moeck P., Moon Jr. B., Sánchez E., Abdel-Hafiez M., Hietschold M., Portland State University, US

The defining features of a scanning probe microscope are a very fine probe that is scanned in two dimensions (2D), in very fine steps, very close to the surface of a sample, and a probe-sample [...]

Polymer nanocomposite based chemiresistive gas sensors

Meka D.A., George L.A., Prasad S., Portland State University, US

We present here the development of a polymer nanocomposite based gas sensor for detecting trace gas emissions in ambient environment. This project is aimed to build a chemiresistive gas sensor with excellent sensitivity and improved [...]

Nanomonitors for Energy Systems

Meka D., Onbattuvelli V., Atre S., Prasad S., Portland State University, US

We present here the design , fabrication and development of a minaturized electrical sensor for aggresive environment monitoring of energy systems.

Palladium/Polymer nanocomposite based Chemiresistive SO2 Sensor

Meka D., Onbattuvelli V., Atre S., Prasad S., Portland State University, US

Here we present a highly sensitive nanocomposite based Chemiresistive SO2 sensor. The main objective of this research is focused on developing a cost effective, integrable and disposable gas sensor which detects SO2 gas molecules in [...]

Ferromagnetic Resonance Biochip for Diagnosing Pancratic Cancer

Casler E., Chae S., Kunduru V., Bothara M., Yang E., Ghionea S., Dhagat P., Prasad S., Portland State University, US

The goal of this research is to be able to develop a device that would be able to detect and diagnosis pancreatic cancer at bedside. The key criteria to be addressed are the cost, portability, [...]

Nanomonitors: Electrical Immunoassays for Protein Biomarker Profiling

Bothara M.G., Reddy R.K., Barrett T., Carruthers J., Prasad S., Portland State University, US

Robust diagnosis of a disease can be accomplished by reliable detection of multiple protein biomarkers. Traditional assay methods for protein detection such as enzyme-linked immunosorbent assay (ELISA) have several limitations – need for use of [...]

‘Lab on a chip’ Label Free Protein Sensor Systems Based on Polystyrene Bead and Nanofibrous Solid Supports

Kunduru V., Prasad S., Patra P.K., Sengupta S., Portland State University, US

Polystyrene bead and electrospun polystyrene nanofibers are employed as subjects of study in this protein biomarker sensor. The study is conducted to compare the sensitivity and efficiency of the polystyrene nanofibers and microspheres as protein [...]

Iridium Oxide Nanowire Monitors for Protein Detection

Venkatraman V.L., Reddy R.K., Zhang F., Hsu V., Ulrich B., Prasad S., Portland State University, US

The overarching research objective is the development of a “point-of-care” immunoassay device based on iridium oxide nanowires for disease state identification to predict human health outcomes. This device is based on electrical detection of proteins [...]