Lizbeth Rostro
Purdue University
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Publication
Featured researches published by Lizbeth Rostro.
ACS Applied Materials & Interfaces | 2013
Lizbeth Rostro; Aditya G. Baradwaj; Bryan W. Boudouris
Macromolecules with aliphatic backbones that bear pendant stable radical groups (i.e., radical polymers) have attracted much attention in applications where a supporting electrolyte is capable of aiding charge transport in solution; however, the utilization of these materials in solid state applications has been limited. Here, we synthesize a model radical polymer, poly(2,2,6,6-tetramethylpiperidinyloxy methacrylate) (PTMA), through a controlled reversible addition-fragmentation chain transfer (RAFT) mediated polymerization mechanism to generate well-defined and easily-tunable functional polymers. These completely amorphous, electronically-active polymers demonstrate relatively high glass transition temperatures (Tg ∼170 °C) and, because of the aliphatic nature of the backbone of the radical polymers, are almost completely transparent in the visible region of the electromagnetic spectrum. Additionally, we quantify the conductivity of PTMA (∼1×10(-6) S cm(-1)) and find it to be on par with pristine π-conjugated polymers such as poly(phenylene vinylenes) (PPVs) and poly(3-alkylthiophenes) (P3ATs). Furthermore, we demonstrate that the addition of small molecules bearing stable radical groups provides for more solid state charge hopping sites without altering the chemical nature of radical polymers; this, in turn, allows for an increase in the conductivity of PTMA relative to neat PTMA thin films while still retaining the same high degree of optical transparency and device stability. Because of the synthetic flexibility and easily-controlled doping mechanisms (that do not alter the PTMA chemistry), radical polymers present themselves as promising and tunable materials for transparent solid-state plastic electronic applications.
Applied Physics Letters | 2014
Aditya G. Baradwaj; Lizbeth Rostro; Muhammad A. Alam; Bryan W. Boudouris
We establish that an oft-used radical polymer, poly(2,2,6,6-tetramethylpiperidinyloxy methacrylate) (PTMA), has a solid-state hole mobility value on the order of 10−4 cm2 V−1 s−1 in a space charge-limited device geometry. Despite being completely amorphous and lacking any π-conjugation, these results demonstrate that the hole mobility of PTMA is comparable to many well-studied conjugated polymers [e.g., poly(3-hexylthiophene)]. Furthermore, we show that the space charge-limited charge carrier mobility of these macromolecules is only a weak function of temperature, in contrast to many thermally-activated models of charge transport in polymeric materials. This key result demonstrates that the charge transport in radical polymers is inherently different than that in semicrystalline, conjugated polymers. These results establish the mechanism of solid-state charge transport in radical polymers and provide macromolecular design principles for this emerging class of organic electronic materials.
Macromolecules | 2014
Lizbeth Rostro; Si Hui Wong; Bryan W. Boudouris
Journal of Polymer Science Part B | 2015
Lizbeth Rostro; Lucio Galicia; Bryan W. Boudouris
MRS Communications | 2015
Lizbeth Rostro; Aditya G. Baradwaj; Alexander R. Muller; Jennifer S. Laster; Bryan W. Boudouris
Macromolecular Chemistry and Physics | 2016
Aditya G. Baradwaj; Lizbeth Rostro; Bryan W. Boudouris
Archive | 2016
Stephen P. Beaudoin; Bryan W. Boudouris; Michelle N. Chaffee-Cipich; Aaron J. Harrison; Stefan Lukow; Lizbeth Rostro; Caitlin J. Schram; Kathryn Smith; Myles Thomas
Bulletin of the American Physical Society | 2016
Bryan W. Boudouris; Lizbeth Rostro; Aditya G. Baradwaj; Jennifer S. Laster
Bulletin of the American Physical Society | 2015
Lizbeth Rostro; Si Hui Wong; Lucio Galicia; Bryan W. Boudouris
Bulletin of the American Physical Society | 2015
Bryan W. Boudouris; Lizbeth Rostro; Aditya G. Baradwaj; Martha E. Hay