Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session G12: Undergraduate Research IV
8:30 AM–9:54 AM,
Sunday, April 14, 2019
Sheraton
Room: Plaza Court 1
Chair: Brad Conrad, Society of Physics Students/Sigma Pi Sigma
Abstract: G12.00005 : Electron Spin Resonance of Magnetic Two-Dimensional Covalent Organic Frameworks*
9:18 AM–9:30 AM
Presenter:
Abigail A. Firme
(Department of Physics, University of Wyoming)
Authors:
Abigail A. Firme
(Department of Physics, University of Wyoming)
Valerie A. Kuehl
(Department of Chemistry, University of Wyoming)
Joseph R. Murphy
(Department of Physics, University of Wyoming)
John O. Hoberg
(Department of Chemistry, University of Wyoming)
William D. Rice
(Department of Physics, University of Wyoming)
Two-dimensional (2D) materials have generated significant interest because of their unique electrical, optical, and magnetic single-layer behaviors. However, the inability to add electrical or magnetic dopants to a substantial set of 2D materials hinders their ability to be incorporated into device architectures. Here, we synthesize 2D covalent organic frameworks (COFs) that have a lattice of nanopores, which we are able to synthetically fill with magnetic ions (Mn2+) that are hexagonally arranged. We use a host of characterization techniques, such as x-ray diffraction, TEM, NMR, and FTIR, to demonstrate that our COFs are ordered, nanoporous, and 2D. Magnetic ion incorporation is empirically shown through electron spin resonance measurements. Unlike the unfilled COFs, which have a single peak at g=2.0, the Mn-filled COFs show a hyperfine-split, sextet of peaks with a spin relaxation time of ~5 ns and a 19 G exchange splitting. The ability to chemically change the nanopore spacing and the inter-ion distance, combined with our confirmation of the hexagonal Mn2+ ion arrangement, suggests the possibility of using these 2D COFs for potential quantum spin liquids or in magneto-optical devices.
*We acknowledge support from the UW School of Energy Resources and the A&S Dean’s Office.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700