The multi-disciplinary research programs in the Fang Group will focus on the bottom-up synthesis
and processing of novel organic polymer materials — namely, ladder and coplanar polymers, as well
as microporous polymer networks — for the applications on electronics and energy conversion/storage.
Our thrust will be to gain profound understanding on the structure-property relationship of these
materials at both the molecular and the macroscopic levels by employing the toolboxes of synthetic
chemistry and device engineering. With this knowledge, we aim to establish a series of synthetically
feasible, high performing, processable organic carbon-based material systems for field effect transistors,
light emitting diodes, solar cells, supercapacitors, and batteries, and to be at the forefront in the
enhancement of their efficiencies.
Milestones for these projects are identified as:
- Feasible bottom-up synthesis and unambiguous characterization of covalently bridged ladder polymers,
noncovalently coplanarized polymers, and cross-linked microporous polymer networks/covalent organic frameworks.
- Successful processing of these materials into application-related forms.
- Fabrication and test of the functional devices.
In order to achieve these benchmarks, the following strategies will be employed:
- Utilizing synthetic versatility of the core structures of the polymers to meet the specific requirements
and to avoid potential synthetic challenges.
- Engineering the sidechains to address the challenges regarding solubility, characterization and processing.
- Incorporating techniques such as (a) in situ processing, (b) post-casting reaction and (c) grafting from the
substrate, to process these materials and to fabricate the devices.
Graduate students joining the Fang Group will receive an extensive training across the broad range of
contemporary organic, polymer and physical chemistry, materials science and process engineering, on the basis
of chemical synthesis. The students are also expected to work and study in a highly collaborative environment,
yet to gain a profound understanding in the research area he/she focuses on.
The Fang Group will be equipped with standard synthetic organic/polymer chemistry facilities, including fume
hoods, rotary evaporators, dry solvent systems, glove boxes and analytical / preparative GPC systems. In addition,
we will obtain instrumentations for thin-film engineering and device characterization, such as spin-coater,
vacuum deposition chamber, probe station, and semiconductor characterization system.
B. S., Wuhan University
Ph. D., Northwestern University
- Zhu, C.; Guo, Z.-H.; Mu, A. U.; Liu, Y.; Wheeler, S. E.; Fang, L.* Low Bandgap Coplanar Conjugated Molecules Featuring Dynamic Intramolecular Lewis Acid-Base Coordination, J. Org. Chem. 2016, 81, 4347-4352.
- Lee, J.; Rajeeva, B. B.; Yuan, T. Y.; Guo, Z.-H.; Al-Hashimi, M.; Zheng, Y. B.; Fang, L.* Thermodynamic Synthesis of Solution Processable Ladder Polymers, Chem. Sci. 2016, 7, 881−889. (Front Cover Highlight, DOI: 10.1039/C6SC90007K).
- Guo, Z.-H.; Ai, N.; McBroom, C. R.; Yuan, T.; Lin, Y.-H.; Roders, M.; Zhu, C.; Ayzner, A.; Pei. J.*; Fang, L.* Side-Chain Engineering Approach to Solvent-Resistant Semiconducting Polymer Thin Films, Polym. Chem. 2016, 7, 648−655.
- Zou, Y.; Yuan, T.; Yao, H.; Frazier, D. J.; Stanton, D. J.; Sue, H.-J.; Fang, L.* Solution-Processable Core-Extended Quinacridone Derivatives with Intact Hydrogen-Bonds, Org. Lett. 2015, 17, 3146−3149.
- Mei, J.; Diao, Y.; Appleton, A. L.; Fang, L.; Bao, Z. Integrated Materials Design of Organic Semiconductors for Field-Effect Transistors, J. Am. Chem. Soc., 2013, In Press.
- Fang, L.; Basu, S.; Sue, C.-H.; Fahrenbach, A. C.; Stoddart, J. F. Syntheses and Dynamics of Donor-Acceptor Catenanes in Water, J. Am. Chem. Soc. 2011 133, 396-399.
- Fang, L.; Wang, C.; Fahrenbach, A. C.; Trabolsi, A.; Botros, Y. Y.; Stoddart, J. F. Dual Stimulus Switching of a Catenane in Water, Angew. Chem. Int. Ed. 2011, 50, 1805-1809.
- Zhang, W.; DeIonno, E.; Dichtel, W. R.; Fang, L.; Trabolsi, A.; Olsen, J.-C.; Benítez, D.; Heath, J. R.; Stoddart, J. F. A Solid-State Switch Containing An Electrochemically Switchable Bistable Poly[n]rotaxane, J. Mater. Chem. 2011, 21, 1487-1495.
- Fang, L.; Olson, M. A.; Benítez, D.; Tkatchouk, E.; Goddard, W. A., III; Stoddart, J. F. Mechanically Bonded Macromolecules, Chem. Soc. Rev. 2010, 39, 17-29.