Electrodeposited alloy film is de-alloyed to yield a nanoporous, high surface area surface.
B.S. Physics, Rice University, 2012
Matthew's research focuses on the use of alloy films for the electrochemical reduction of CO2. Although many metals can reduce CO2 at cathodic potentials, research has focused on Cu because of its ability to produce relatively large amounts of hydrocarbons during this process. However, CO2 reduction on Cu requires a large overpotential, resulting in low process efficiency. Au is able to reduce CO2 at lower overpotentials, but mainly produces CO.
It is hypothesized that alloys may allow for the multi-step reduction of CO2 to CO and CO to hydrocarbons via bimetallic effects. By controlling the morphology of the alloys through electrolyte chemistry and de-alloying we aim to optimize the reduction of CO2 on these alloys.
Outside of research, Matthew enjoys cooking, reading, and making fun of B-movies.
Magnetic characterization of Fe-Pt-Ni films.
B.S. Materials Physics, University of Science and Technology of China, 2012
Siyuan joined Dr. Zangari’s group to explore the electrodeposition of magnetic alloys and to tailor their magnetic properties for applications in magnetic storage and sensing. In her spare time, she likes movies, ball games and travelling.
Electrowetting of dielectrics. Images from Shamai, R. Soft Matter 2008, 4, 38.
B.S. Chemical Engineering, University of Virginia, 2010
M.S. Materials Science and Engineering, University of Virginia, 2013
Marcel’s research focuses on studying low voltage electrowetting-on-dielectric (EWOD) systems. EWOD consists in the change in apparent contact angle through the application of an external voltage, a phenomena which is at the basis of numerous microfluidic devices. Our efforts focus on understanding failure in thin high-k dielectrics biased in the solid state as well as in a metal/dielectric/electrolyte configuration, and on the fabrication of hydrophobic topcoats using fluoropolymers or self-assembled monolayers. The contact angle hysteresis and saturation of these layers in low voltage operation is studied both in a static and dynamic contact angle configuration; this allows to achieve a better understanding of the surface quality and to assess the performance of the interface under operation.
TiO2 nanotubes formed by anodization.
B.S. Physics, James Madison University, 2009
M.S. Materials Science and Engineering, University of Virginia, 2011
Solar energy is one of the few renewable, carbon-free energy sources capable of meeting the world’s energy demands in the 21st century. However, one of the main challenges of solar energy is that demand continues throughout the night, when photovoltaic (PV) solar cells can only operate when the sun is shining. To complement solar PV, Lok-kun is developing photoelectrochemical solar cells which convert directly sunlight into hydrogen as a storable fuel using TiO2 nanotubes as photoanode materials. The high surface area, 1D charge transport, and resistance to corrosion in solution and under light make them attractive as a photoelectrochemical solar cell material. Our work focuses on nanotube modification to enhance electrical transport properties, widen the absorption spectrum, and facilitate the reaction of water oxidation. His interests outside of school includes game design, programming, and sky photography.
B.S. Materials Science and Engineering, Gebze Institute of Technology, 2010
M.S. Materials Science and Engineering, Gebze Institute of Technology, 2012
Begum joined Dr. Zangari’s group in 2012. She is currently working on the electrodeposition of Cu-In thin films as precursors for the promising photovoltaic material CuInSa2. Electrodeposition is a relatively low-cost method for the synthesis of semiconductor absorber films, especially compared to vacuum system methods. Using underpotential electrodeposition, it is possible to synthesize CuIn films with uniform composition, facilitating homogeneous sulfurization and thus achieving the stoichiometry required for efficient and stable photovoltaic cells.
Outside of her academic endeavors, Begum is interested in Renaissance music and she likes to travel to archeological places.