Theva Thevuthasan

Developing in-spectrometer photochemistry and integration of molecular imaging techniques: Probing photoinduced electronic structure variations in dye-sensitized TiO2 model system

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Ponnusamy Nachimuthu

The aim of this project is to develop capabilities that will advance the fundamental understanding of charge transfer and photochemical behavior of organic molecular layers on surfaces as applicable…

Developing next generation multimodal chemical imaging capability by combining STEM/APT/STXM/HIM

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Arun Devaraj

Understanding complex energy conversion and storage systems hinges upon developing a fully three-dimensional analysis of the structure and chemistry with sub-nanometer spatial and chemical resolution…

Molecular-scale visualization of ligand conformation on functionalized nanoparticles: A combination of experimental and theoretical studies

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

The goal of this project is to develop capabilities that will advance the fundamental understanding of the interaction between the nanoparticles surfaces and organic ligand molecules as applicable to…

Probing the Mesoscale Structure at Complex Electrode-Electrolyte Interfaces

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Vijayakumar Murugesan

Project type

Large-Scale EMSL Research

Molecular interactions at electrode-electrolyte interface are pivotal to the modern energy storage/conversion and microelectronic devices. However, our predictive understanding about the impact of…

Analysis of Spent Free Electron Laser Photocathodes

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Wayne Hess

Project type

Limited Scope

This project will use existing capabilities to characterize expired photocathode materials. We will conduct post-mortem investigations of used (expired) photocathodes from JLab to determine…

Structural evolution and phase transformation characteristics of amorphous silicon upon lithiation and delithiation

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Scott Lea

Amorphous silicon (a-Si) has been identified as a candidate high capacity anode material for lithium ion batteries. A fundamental challenge with a-Si is the large volume change upon lithium…

Light Source Photocathode Performance and Development

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

Accelerator photocathode technology must be advanced to meet the needs of fourth generation light sources. The ultimate output characteristics and cost of next generation UV or X-ray sources, whether…

A multi-modal approach to understanding the structural evolution and phase transformation of amorphous silicon upon lithiation insertion and extraction

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Scott Lea

Amorphous silicon (a-Si) has been identified as a candidate high capacity anode material for lithium ion batteries. A fundamental challenge with a-Si is the large volume change upon lithium…

Characterization of Glass Artifacts from the Iulia Felix and Aquileia - Man-made Analogues for Nuclear Waste Glass

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

Characterization of the glasses recovered from the sunken ship, Iulia Felix and the cemented sediment that surrounded the glass can yield data useful to the archaeologists and to those responsible…

Probing the Mesoscale Structure of Complex Electrode-Electrolyte Interfaces

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Vijayakumar Murugesan

Project type

Large-Scale EMSL Research

Molecular interactions at electrode-electrolyte interface are pivotal to the modern energy storage/conversion and microelectronic devices. However, our predictive level understanding about the…

Elucidation of Structure-Activity Relationships in Inhalation Nanotoxicology

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

Multiwalled Carbon Nanotubes (MWCNT) are of great commercial interest. However, with increasing applications and production capacities of MWCNT, they are coming under intense scrutiny by the…

Developing Three-dimensional characterization methods for energy and environmental materials

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Arun Devaraj

Three dimensional high resolution nanoscale characterization is pivotal in understanding materials relevant to energy and environmental applications. As a part of this proposal and an LDRD funded by…

Characterization of inorganic thin films on polymer substrate

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

We have received some oxide thin films that were grown on polymer substrate for characterization as a part of TAP program. The PIs are interested in elemental qunatifications in these films.

High-capacity cathode and anode materials for sodium batteries

Lead Institution

Qatar Foundation

Principal Investigator

Hamdi Yahia

Project type

Large-Scale EMSL Research

Since the sodium reserves are easily accessible, we decided to investigate sodium ion batteries (NaIBs), as new energy storage systems, for large-scale battery applications. This proposal seeks to…

TiO2 photocatalyst poisoning/contamination TAP project

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Mark Engelhard

Puralytics makes a water treatment system using UV-activated photoctalysis to remove organic and other contaminates from water. The photocatalytic material is becoming de-activated/contaminated by…

Deposition of Metal-Doped Oxides for Spintronic Applications

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Tiffany Kaspar

Project type

Exploratory Research

For spintronic devices such as spin-FETs, efficient injection of spin-polarized electrons into a semiconductor material is necessary. For devices compatible with current semiconductor technology,…

Nanolayered, Self-healing Radiation Shielding Foils

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

Recent discovery and research indicate that materials can be hardened against radiation damage by building nanolayered structures with an optimized layer thickness to increase point defect…

Influence of Gd and Sm Doping on Atomic and Ionic Transport Properties of Novel Nanostructured Ceria-Zirconia Multilayers

Lead Institution

Battelle India

Principal Investigator

Satyanarayana Kuchibhatla

Project type

Exploratory Research

This project aims to develop the understanding of ionic transport processes in nanostructured materials that may enable the design of new types of electrolyte materials for electrochemical device…

Light Source Photocathode Performance and Development

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Wayne Hess

Project type

Exploratory Research

Accelerator photocathode technology must be advanced to meet the needs of fourth generation light sources. The ultimate output characteristics and cost of next-generation ultraviolet or x-ray…

Photochemical studies on N-doped TiO2 single crystals - Fundamental Investigations of Water Splitting on Model TiO2 (Mike Henderson's BES Project - 48526)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Michael Henderson

Project type

Exploratory Research

This program's overall goals are aimed at the development of new energy sources for the 21st century. Hydrogen has considerable potential as an alternative fuel. Research includes examining the…

Micro-fabrication of Miniaturized Solid Oxide Fuel Cell (SOFC) on Silicon Chip

Lead Institution

University of Connecticut

Principal Investigator

Prabhakar Singh

Project type

Exploratory Research

We propose the development of miniaturized solid oxide fuel cell on silicon chip in EMSL micro-fabrication facility. Under this proposal, initial focus will be given on the demonstration of the…

Volumetric Density of Alpha-recoil Tracks in Uranium Oxide by TEM

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

Considerable effort has been and is being expended to explore various avenues related to nuclear forensics, whether they are for environmental signatures, remediation, or proliferation detection and…

Structure and property tailoring of metal nanoparticles dispersed in dielectrics by high energy ion implantation

Lead Institution

University of Tennessee

Principal Investigator

Gerd Duscher

Project type

Exploratory Research

High energy ion beam will be used to tailor structure of metal nanoparticles dispersed in dielectric medium. The typical examples are Au, Fe, Co, and Cr implanted into SrTiO3, MgO, TiO2. The…

Photochemical studies on N-doped TiO2 single crystals - Fundamental Investigations of Water Splitting on Model TiO2 (Mike Henderson's BES Project - 48526)

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Michael Henderson

Project type

Large-Scale EMSL Research

Development of new energy sources is a major need for the 21st century. Hydrogen has considerable potential as an alternative fuel. The discovery by Fujishima and coworkers in 1969 that water could…

Influence of Phase-Changing Medium on Surface-Enhanced Electromagnetic Fields and Coherence Lifetime of Active Plasmonic Nanostructures

Lead Institution

Vanderbilt University

Principal Investigator

Richard Haglund

Project type

Large-Scale EMSL Research

The miniaturization of photonic circuits is critical to 21st century data processing and telecommunication technologies. Plasmonics, based on the optical properties of metallic nanostructures, holds…

Spin Electronic Phenomena in Magnetically Doped Perovskites and Complex Oxide Interfaces

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Scott Chambers

Project type

Large-Scale EMSL Research

Semiconductor spintronics has the potential to create entirely new paradigms for analog and digital electronics which may have a significant impact on energy consumption and efficiency. However,…

Light Source Photocathode Performance and Development

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Wayne Hess

Accelerator photocathode technology must be advanced to meet the needs of fourth generation light sources. The ultimate output characteristics and cost of next generation UV or X-ray sources, whether…

Fundamental understanding of charge transfer from a Ru-based dye adsorbate to a TiO2(110) surface

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Michael Henderson

Project type

Large-Scale EMSL Research

Ru-based dye-sensitized TiO2 solar cells have attracted significant attention because of their potential use in photovoltaic cells[1,2]. These devices utilize films of optically transparent TiO2…

Characterization of Ore Components

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

Rocks pieces, ground rocks and moss with sand need to be assayed using particle induced x-ray emission, x-ray photoelectron spectroscopy and scanning electron microscopy. The elements in these…

In-situ electron microscopy and spectroscopy studies of interfaces in advanced Li-ion batteries under dynamic operation conditions

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Chongmin Wang

Repeated charging and discharging of the Li-ion battery induces microstructural evolutions both at the interface between the electrolyte and the electrode and within the electrode (active materials)…

Probing Structure-Property Relationship of Energy Storage Materials Using Ex Situ and In Situ Dynamic Microscopy and Spectroscopy with High Spatial and Fast Temporal Resolution

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Chongmin Wang

The specific aims of this project are to probe the structure-property relationship of next-generation energy materials (such as energy storage materials) under dynamic operating conditions with a…

Experimental investigation and theoretical validation of growth, morphology, and chemistry of cuprous oxide nanoclusters on STO (100) substrate

Lead Institution

Pacific Northwest National Laboratory

Principal Investigator

Charles Henager

Project type

Large-Scale EMSL Research

Growth of electronic materials as single crystals for a variety of uses can be limited by the lack of fundamental understanding of the nucleation, growth, and coalescence regime at the initial stages…

Investigating the interactions between linker and drug molecules and nanocrystalline surface along with cytotoxicity measurements

Lead Institution

Environmental Molecular Sciences Laboratory

Principal Investigator

Theva Thevuthasan

Identifying and synthesizing a target specific and controlled release nanoparticle based drug delivery system (DDS) provides a great potential to overcome the barriers facing existing cancer therapy…

Projects