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Dive into the research topics where Doyun Lee is active.

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Featured researches published by Doyun Lee.


Journal of Materials Chemistry | 2013

Hierarchically porous materials via assembly of nitrogen-rich polymer nanoparticles for efficient and selective CO2 capture

Doyun Lee; Chengyi Zhang; Chuan Wei; Brandon L. Ashfeld; Haifeng Gao

Hierarchically porous materials were developed using a two-step procedure by (1) the stacking of high-nitrogen-content polymer nanoparticles to produce inter-particle mesoporous space and (2) chemical activation to create intra-particle micropores. The materials exhibited efficient CO2 uptake and enhanced CO2/N2 selectivity, which is 40% higher than that of the control material without a hierarchical structure.


Macromolecular Rapid Communications | 2014

Developing porous honeycomb films using miktoarm star copolymers and exploring their application in particle separation.

Chengyi Zhang; Xiaofeng Wang; Ke Min; Doyun Lee; Chuan Wei; Hannah Schulhauser; Haifeng Gao

This paper reports for the first time the synthesis and application of miktoarm star copolymers to produce highly ordered honeycomb films using the breath figure technique. Miktoarm star copolymer containing a cross-linked core and two arm species, e.g., polystyrene and poly(t-butyl acrylate), is successfully synthesized using ATRP in a one-pot arm-first method. Various experimental parameters, including polymer architectures, solvents, polymer concentrations, and substrates, are explored to investigate their effects on the structure of the honeycomb films. It is found that miktoarm star copolymers with high molecular weight and spherical shape could readily produce ordered honeycomb films in a broader range of concentrations and humidity than linear block copolymers with similar chemical compositions but lower molecular weight. Partial hydrolysis of poly(t-butyl acrylate) arm species in the honeycomb film transforms the surface property from hydrophobic to hydrophilic while maintaining the films mechanical stability in water. This porous monolayer film with uniform pore size distribution and inter-connected pore channels is successfully applied for separation of microparticles with different sizes.


Chemistry of Materials | 2012

Enhanced and tunable open-circuit voltage using dialkylthio benzo[1,2-b: 4,5-b′]dithiophene in polymer solar cells

Doyun Lee; Emir Hubijar; Grace Jones Daba Kalaw; John P. Ferraris


Chemical Communications | 2011

A novel dialkylthio benzo[1,2-b: 4,5-b′]dithiophene derivative for high open-circuit voltage in polymer solar cells

Doyun Lee; Shane W. Stone; John P. Ferraris


Journal of the American Chemical Society | 2014

Relationship between interchain interaction, exciton delocalization, and charge separation in low-bandgap copolymer blends

Zhi Guo; Doyun Lee; Richard D. Schaller; Xiaobing Zuo; Byeongdu Lee; Tengfei Luo; Haifeng Gao; Libai Huang


Polymer | 2015

Developing recyclable pH-responsive magnetic nanoparticles for oil–water separation

Xiaofeng Wang; Yi Shi; Robert W. Graff; Doyun Lee; Haifeng Gao


Physical Chemistry Chemical Physics | 2014

Tuning the thermal conductivity of solar cell polymers through side chain engineering

Zhi Guo; Doyun Lee; Yi Liu; Fangyuan Sun; Anna Sliwinski; Haifeng Gao; Peter C. Burns; Libai Huang; Tengfei Luo


Journal of Physical Chemistry B | 2015

Exciton Structure and Dynamics in Solution Aggregates of a Low-Bandgap Copolymer.

Zhi Guo; Doyun Lee; Haifeng Gao; Libai Huang


Physical Chemistry Chemical Physics | 2014

Thermal conductivity of organic bulk heterojunction solar cells: an unusual binary mixing effect

Zhi Guo; Doyun Lee; Joseph Strzalka; Haifeng Gao; Libai Huang; Ali M. Khounsary; Tengfei Luo


Journal of Physical Chemistry B | 2013

Synthesis and Characterization of a Novel Symmetrical Sulfone-Substituted Polyphenylene Vinylene (SO2EH-PPV) for Applications in Light Emitting Devices

Emir Hubijar; Alexios Papadimitratos; Doyun Lee; Anvar A. Zakhidov; John P. Ferraris

Collaboration


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Haifeng Gao

University of Notre Dame

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Libai Huang

University of Notre Dame

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Zhi Guo

University of Notre Dame

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John P. Ferraris

University of Texas at Dallas

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Chengyi Zhang

University of Notre Dame

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Tengfei Luo

University of Notre Dame

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Chuan Wei

University of Notre Dame

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Xiaofeng Wang

University of Notre Dame

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Anvar A. Zakhidov

University of Texas System

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Emir Hubijar

University of Texas at Dallas

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