Chemically Tunable 2D Materials
Abstract
Chemically Tunable 2D MaterialsSOWSynthesize 2D layered silicon telluride, bismuth selenide, and molybdenum trioxideEnhance and re-evaluate synthesis methods for large scale-up for possible applied usageIntercalate zero-valent metals into 2D materialsEvaluate adjusted material properties through characterization tools such as TEM, XRD, SEM, and AFMCreate electronic devices from 2D materials Perform in-situ TEM and XRD measurements to identify phase changes and electronic bonding changes of materialsDevelop core theories to explain physical and chemical behaviors engineered through zero-valent intercalationObjectiveDevelop new 2D layered materials with chemically tunable properties, including: (i) new opto-electronic silicon-based 2D materials, (ii) new material coatings that can change color chemically or with heat, and (iii) chemically tunable materials adaptable for a specific application such as electronic devices, optical devices, or electrodes with chemically enabled conduction and transparency.ApproachThis proposal aims to design, fabricate, and characterize new types of 2D materials with chemically tunable properties. It will build upon a technique the PI invented to intercalate zero-valent metal atoms into the van der Waals gaps of layered materials. For example, this group (in work published in 2014 and 2015) demonstrated the intercalation of copper into nanoribbons of MoO3. Heating the structures produced nanometer-scale ordering of the copper, resulting in a superlattice structure and a charge density wave. The color of the MoO3 can be reversibly tuned from transparent to blue through heat and intercalation. An advantage of the intercalation method is that it is relatively straightforward to apply it to a variety of intercalated species to many different hosts, unlike, for example, a growth technique such as molecular beam epitaxy. In addition, the proposal includes investigations of a more basic nature. Using in situ x-ray diffraction and transmission electron microscopy (as demonstrated in their 2014 paper in 2D Materials), changes in the material structures can be measured as a function of temperature which will allow explanations in terms of parameters such as lattice strain and bond energy. These studies will provide invaluable guidance for the design of future materials.Relavance/MeritThis is an excellent proposal that is likely to result in important advances in the understanding and application of intercalated species into 2D materials. It fits into the ~Beyond Graphene~ field, but goes in a different direction than much of the current work by vastly expanding the range of composition and tunability of technologically-important materials. The PI has an impressive track record, including her work as a postdoc in which she was the first to demonstrate intercalation of metal species into van der Waals gaps of 2D materials. She is only in her second year at Brown, but her group is already very productive which bodes well for the success of this project. This proposal identifies several 2D materials of technological interest (Si2Te3 for chemical sensors or night-vision goggles, MoO3 for smart windows, and Bi2Se3 as a thermoelectric material and topological insulator), demonstrates an excellent understanding of the known structure and properties of these materials, and proposes a credible route to tuning the electronic and optical properties. There are potential applications to electro-optical and electronic devices in Naval systems.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 23, 2016
- Source ID
- N000141613161
Entities
People
- Kristie J Koski
Organizations
- Office of Naval Research
- United States Navy
- University of California, Davis