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Kipp van Schooten Thesis Defense 12/05/12

Thesis Defense

Kipp van Schooten

Wednesday, December 5, 2012
3:30pm (110 INSCC)

Title: Optically Active Charge Traps & Chemical Defects in Semiconducting Nanocrystals Probed by Pulsed Optically Detected Magnetic Resonance

Abstract:

The forefront of current nanoscience initiatives includes the investigation and development of semiconducting colloidal nanocrystals for optoelectronic device concepts. Being highly facile in their synthesis, a wide range of sizes, morphologies, materials, interactions and effects can easily be engineered. Their solution-processability also offers the prospect of extremely cheap device manufacturing. Additionally, this material class makes available a type of “playground” for generating and observing novel quantum effects within reduced dimensions.

Since the surface-to-volume ratio is very large in these systems, unsatisfied surface states are able to dominate the energetics of these particles. Serving as charge “trap” states, their effect on observables is readily seen, for instance, in single particle photoluminescence blinking. Unfortunately, most methods used to observe their influence are inherently blind to the chemical identity of these sites. In absence of such structural information, systematically engineering a robust passivation system becomes problematic.

The development of pulsed optically detected magnetic resonance (pODMR) as a method for directly addressing the chemical nature of optically active charges while under trapping conditions is the primary tenet of this thesis work. Several trapping channels are observed in CdS nanorods, while two in particular are correlated, demonstrating for the first time that both electrons and holes are able to be trapped within the same nanoparticle at the same time. The intrinsically long spin coherence lifetime for these states allows for the spin multiplicity and degree of isolation to be explored, and opens the possibility of highly precise chemical fingerprinting through electron spin echo envelop modulation (ESEEM). Demonstration of novel effects is also performed for CdS/CdSe heterostructure tetrapods, such as coherent control of the light-harvesting process and remote readout of spin information.

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This Week's Colloquium: Robert Davis, Dec. 6, 2012

Robert Davis
Brigham Young University

Thursday, Dec. 6, 2012
102 JFB

Refreshments: 3:30 pm in 219 JFB
Lecture 4:00pm (102 JFB)

Title: Carbon Nanotube Templated Microfabrication

Abstract:

Precision microscale manufacturing, driven initially by the microelectronics industry, has more recently been extended to fabricate structures for mechanical and optical applications. Very low cost microscale mechanical sensors have become ubiquitous; most smart phones now incorporate microfabricated accelerometers and gyros. Silicon is not only the anchor material for microelectronics but vertically etching of silicon is also used to create the three dimensional microstructures used in applications ranging from inertial sensors to neural probe arrays. We have recently developed carbon nanotube templated microfabrication (CNT-M), a fabrication technique that is complementary in several ways to vertical silicon etching. CNT-M enables high aspect ratio fabrication of microstructures from a wide range of materials including ceramics and metals. We now use CNT-M to fabricate structures for applications ranging from energy storage to chemical filtration and detection.

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Frontiers of Science with Pearl Sandick

Wednesday, Nov. 28 @ 7:30 p.m. - Frontiers of Science with Pearl Sandick! "Particle Smashers, Higgs Hunters, & the Fundamental Theory of the Universe" at the ASB on the U of U Campus!.

FRONTIERS OF SCIENCE

with Dr. Pearl Sandick,
Assistant Professor of Physics & Astronomy

Particle Smashers, Higgs Hunters, & the Fundamental Theory of Nature

Date & Time:Wednesday, Nov. 28, 2012. 7:30 - 8:30 PM

Location: 220 Aline Skaggs Building at the University of Utah
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On July 4th, 2012, a Higgs-like particle was discovered by the Large Hadron Collider. This discovery is a major step towards the goal of understanding the origin of mass, with implications for the fundamental theory of physics that describes our universe.

In this lecture, Dr. Pearl Sandick tells the story of the Higgs boson, the researchers searching for it, and what it means for the future of particle physics.

Frontiers of Science is free and open to the public. Please arrive early, as seating and parking will be limited.

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This Week's Colloquium: Tatjana Jevremovic, Nov. 29, 2012

Tatjana Jevremovic
University of Utah Nuclear Engineering
EnergySolutions Presidential Endowed Chair Professor
Director of the Utah Nuclear Engineering Program

Thursday, Nov. 29, 2012
102 JFB

Refreshments: 3:30 pm in 219 JFB
Lecture 4:00pm (102 JFB)

Title: Utah Nuclear Engineering Program: New Development in Curricula, Research, Training & Outreach

Abstract:

The University of Utah Nuclear Engineering Program (UNEP) is restructured, modernized and revitalized starting fall of 2009, with the goal to meet the expectations of the 21st century nuclear engineering education, research and development. Our focus areas are on nuclear power, nuclear forensics, advanced computational simulations, visualizations and modeling, nuclear medicine, and nuclear materials detection. UNEP houses a number of facilities providing unique opportunities to students and faculty. Our facilities include one of 13 left TRIGA research reactors, radiochemistry lab, radiation measurement lab, nuclear forensics lab, radiation detection lab, computer lab, microscopy lab, and BNCT lab. Our new curriculum is structured to assure our graduates will be highly-­‐ skilled, uniquely-­‐trained with hands-­‐on experience using our facilities, and prepared for jobs in nuclear power sector, nuclear nonproliferation, forensics and safeguards, nuclear medicine and radiation detection fields. An overview of educational, training, research and outreach programs will be provided.

Biography

Dr Tatjana Jevremovic, native of Serbia, received her BS and MS degrees in nuclear engineering at the University of Belgrade, Serbia, and her PhD degree in nuclear engineering at the University of Tokyo, Japan. She was a project manager in Energoproject Co. in Belgrade for 8 years, Chief Engineer in Nuclear Fuel Industries, Ltd. in Japan for 5 years; she was a professor at the University of Tokyo for 2 years, at Purdue University for 8 years. While in Nuclear Fuel Industries, Ltd. in Japan, she has developed a nuclear reactor lattice physics code for advanced simulations of nuclear power reactor performances. The code was selected to be included as a part of the BWR power plants licensing procedure in Japan. In 2001 she received a prestigious company annual award for that development. From 2009 she is Endowed Chair Professor and Head of Nuclear Engineering Program and The University of Utah, Salt Lake City. She authored a textbook, Nuclear Principles in Engineering published by Springer, that is used at a number of universities worldwide. She published over 150 conference and journal papers mainly in the fields of nuclear reactor physics modeling, radiation transport, nuclear medicine, nuclear forensics and nuclear engineering education.

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