Functional Materials Research from UES Featured in Key Publications
November 17, 2021
We're excited to share our Biological & Nanoscale Technologies team's latest publications!
The first, an invited review in Materials Today titled "Synthesis and tailored properties of covalent organic framework thin films and heterostructures" addresses recent progress in the construction and tailored properties of thin film porous polymeric covalent organic frameworks (COFs), with applications in filtration, electronics, sensors, electrochemistry, magnetics, optoelectronics and beyond.
UES Scientists Lucas K. Beagle and Ly D. Tran collaborated with rsearchers from the Materials and Manufacturing Directorate, Air Force Research Laboratory, as well as Department of Materials Science and Nanoengineering, Rice University, and Department of Chemical and Materials Engineering, University of Dayton to review the fast-developing area of Porous polymeric covalent organic frameworks. Multiple techniques such as interfacial synthesis, chemical exfoliation and mechanical delamination are used to convert material powders into thing films with stringent control of thickness and morphology. Additionally, heterogeneous integration of these thin films with other inorganic and organic materials is discussed, revealing exciting opportunities to integrate COF thin films with other state of the art material and device systems. The review was written as a guide book for the reader to easily design COFs for incorporation in thin film and heterostructure applications that through purposeful, tailored design will include specific desired properties.
We’d be remiss if we didn’t note that another UES scientist, Dr. Kara Martin, created the detailed illustrations.
You can read the full article online in Materials Today.
The second article is focused on chemical sensors based on solution-processed 2D #nanomaterials. Such materials (like MoS2) represent an extremely attractive approach toward scalable and low-cost devices. UES researchers David Moore, Ali Jawaid, Robert Busch, Paige Look, Adam Miesle, Lucas Beagle and Michael Motala, and collaborators from the AFRL, UTC, Northwestern University and the University of Dayton teamed up to perform this work
Through the implementation of real-time impedance spectroscopy and development of a three-element circuit model, redox exfoliated MoS2 nanoflakes demonstrate an ultrasensitive empirical detection limit of NO2 gas at 1 ppb, with an extrapolated ultimate detection limit approaching 63 ppt. The team developed a sensor construct that reveals a more than three orders of magnitude improvement from conventional direct current sensing approaches as the traditionally dominant interflake interactions are bypassed in favor of selectively extracting intraflake doping effects. This same approach allows for an all solution-processed, flexible 2D sensor to be fabricated on a polyimide substrate using a combination of graphene contacts and drop-casted MoS2 nanoflakes, exhibiting similar sensitivity limits.
You can read the full article online in Advanced Functional Materials.