Publications

Names in bold letters indicate authors from the group, *Corresponding author, § Equal contribution

Recent & Selected publications

Vacuum-depositable Fluorinated Photoresist toward Organic Light-Emitting Diode (OLED) Patterning

Gayoung Kim, Yu-Jeong Kwon, Hyo-Eun Choi, Hanbeen Lee, Jeong-Hwan Lee, Myungwoong Kim, Jin-Kyun Lee,* Gwiwon Jang, Taewoo Kim, Jun Yeob Lee, Keewook Paeng,* Eun Yeong Soh, Doo Hong Kim, Byung Jun Jung,*

ACS Materials Letters, 2025, 7, 2988-2995 

Greater Influence of Density on the Electrical Properties of an Organic Semiconductor Glass Compared to Molecular Orientation

Gwiwon Jang, Taewoo Kim, Junho Lee, Joonsuk Huh, Seong Eun Kim, So Youn Kim, Yasushi Koishikawa, Ohyun Kwon,* and Keewook Paeng*

Journal of Physical Chemistry B, 2025, 129, 1689-1696 

Published as part of The Journal of Physical Chemistry B special issue “Mark Ediger Festschrift”.

Nanoscale Structural Heterogeneity  in Inter- and Intrachain Entangled Polymer Networks Probed Using the Random Barrier Model 

Hyeyoung Joung,§  Dongho Kang,§  Jaesang Yu, Inyoung Cho, Soohyun Lee, Keewook Paeng,* Jaesung Yang*

Macromolecules, 2025, 58, 877-884  

Intermolecular lithium bonding between different components upon mixing simultaneously enhances the thermal and electrical properties of an amorphous organic semiconductor material 

Seon Bin Song,§  Myungsun Sim,§ Min Seok Ki,§  Taewoo Kim, You Kyoung Chung, Joonsuk Huh, Ohyun Kwon,* and Keewook Paeng*

Journal of Materials Chemistry C, 2024, 12, 5469-5479 

Segmental Dynamics of Polystyrene near Polymer-Polymer Interfaces

Jeongin Lee,§ Soohyun Lee,§ Keonchang Lee, Hyeyoung Joung, Seug Kun Choi, Myungwoong Kim, Jaesung Yang,* and Keewook Paeng* 

Journal of Chemical Physics, 2024, 160, 124902

Segmental dynamics of an isolated component polymer chain in polymer blends near the glass transition

Hyangseok Lee, Taegeun Kim, Seungyeon Choi, Jaesung Yang,* Myungwoong Kim,* and Keewook Paeng*

Macromolecules, 2023, 56, 8133-8143

Improved Thermal Stability and Operational Lifetime of Blue Fluorescent Organic Light Emitting Diodes by using A Mixed Electron Transporting Layer 

Min Seok Ki,§ Myungsun Sim,§ Ohyun Kwon,*  Kyuhyun Im, Byoungki Choi,* Byeong Jun Cha, Young Dok Kim, Tae Young Jin, and Keewook Paeng*

ACS Materials Letters, 2022,  4, 1676−1683

Single molecule demonstration of Debye–Stokes–Einstein breakdown in polystyrene near the glass transition temperature

Nicole L. Mandel, Soohyun Lee, Kimyung Kim, Keewook Paeng*, and Laura J. Kaufman*

Nature Communications, 2022, 13,  3580 

Direct Observations of Segmental Dynamics at the Polymer–Substrate Interface Enabled by Localizing Fluorescent Probes with Polymer Brushes

Yura Chung,§ Jieun Nam,§ Dongwan Son, Hyangseok Lee, Myungwoon Kim*, and Keewook Paeng*    

Macromolecules, 2021, 54, 4546−4556

How Tethered Probes Report the Dynamics of a Polymer near the Glass transition

Jiwon Choi,§ Soohyun Lee,§ Jongwon Choe, Yura Chung, Yae Eun Lee, Jisu Kim, Myungwoon Kim*, and Keewook Paeng*     

ACS Macro Letters, 2019, 8, 1191-1186

Full list

55. Vacuum-depositable Fluorinated Photoresist toward Organic Light-Emitting Diode (OLED) Patterning

Gayoung Kim, Yu-Jeong Kwon, Hyo-Eun Choi, Hanbeen Lee, Jeong-Hwan Lee, Myungwoong Kim, Jin-Kyun Lee,* Gwiwon Jang, Taewoo Kim, Jun Yeob Lee, Keewook Paeng,* Eun Yeong Soh, Doo Hong Kim, Byung Jun Jung,*

ACS Materials Letters, 2025, 7, 2988-2995

54. Greater Influence of Density on the Electrical Properties of an Organic Semiconductor Glass Compared to Molecular Orientation

Gwiwon Jang, Taewoo Kim, Junho Lee, Joonsuk Huh, Seong Eun Kim, So Youn Kim, Yasushi Koishikawa, Ohyun Kwon,* and Keewook Paeng*

Journal of Physical Chemistry B, 2025,  129, 1689-1696 

Published as part of The Journal of Physical Chemistry B special issue “Mark Ediger Festschrift”.

53. Nanoscale Structural Heterogeneity  in Inter- and Intrachain Entangled Polymer Networks Probed Using the Random Barrier Model 

Hyeyoung Joung,§  Dongho Kang,§  Jaesang Yu, Inyoung Cho, Soohyun Lee, Keewook Paeng,* Jaesung Yang*

Macromolecules, 2025, 58, 877-884  

52. Intermolecular lithium bonding between different components upon mixing simultaneously enhances the thermal and electrical properties of an amorphous organic semiconductor material 

Seon Bin Song,§  Myungsun Sim,§ Min Seok Ki,§  Taewoo Kim, You Kyoung Chung, Joonsuk Huh, Ohyun Kwon,* and Keewook Paeng*

Journal of Materials Chemistry C, 2024, 12, 5469-5479 

51. Segmental Dynamics of Polystyrene near Polymer-Polymer Interfaces

Jeongin Lee,§ Soohyun Lee,§ Keonchang Lee, Hyeyoung Joung, Seug Kun Choi, Myungwoong Kim, Jaesung Yang,* and Keewook Paeng* 

Journal of Chemical Physics, 2024, 160, 124902

50. Segmental dynamics of an isolated component polymer chain in polymer blends near the glass transition

Hyangseok Lee, Taegeun Kim, Seungyeon Choi, Jaesung Yang,* Myungwoong Kim,* and Keewook Paeng*

Macromolecules, 2023, 56, 8133-8143

49. Photopatternable and Self-Healable Ionogels for Organic Thin-film Transistors

Seungjun Kim,§ Jiyeong Yeo,§ Su Jung Kim, Soeun Park, Kyung Gook Cho, Keewook Paeng,* Keun Hyung Lee,* and Myungwoong Kim*

Organic Electronics, 2023, 122, 106895

48. Aggregates of Conjugated Polymers: Bottom-Up Control of Mesoscopic Morphology and Photophysics

Chanwoo Kim§, Hyeyoung Joung§, Hyung Jun Kim, Keewook Paeng*, Laura J. Kaufman*, and Jaesung Yang*

NPG Asia Materials, 2023, 15, 32

47. CuBTC Metal–organic Framework Decorated with FeBTC Nanoparticles with Enhance Water Stability for Environmental Remediation Applications 

Donghun Kim, Ik Ji Kim, Hyuk Taek Kwon, Keewook Paeng* and Hoik Lee*

ACS Omega, 2023, 8, 17, 14900-14906

46. Roll-to-Roll Processing of Hybrid MOF and Nylon Membranes for High Efficiency Removal of Toxic Gases, Heavy Metals, and Dyes 

Donghun Kim, Ki Chul Koo, Jong Ho Park, Keewook Paeng* and Woosung Lee*

ACS Applied Engineering Materials, 2023, 1, 4, 1220-1228

45. Polymer Segmental Dynamics Near the Interface of Silica Particles in the Particle/Polymer Composites 

Ganghee Park§, Hyangseok Lee§, Jae Hyun Sim, Ahyun Kim, Myungwoong Kim*, and Keewook Paeng*

Journal of Colloid & Interface Science, 2023, 629, 256-264 

44. Connection between the time distribution and length scale of dynamic heterogeneity explored by probe reorientations of different sizes 

Kimyung Kim, Soohyun Lee, Taegeun Kim, You Kyoung Chung, Joonsuk Huh, Jaesung Yang, Anna Lee, and Keewook Paeng*

Journal of Chemical Physics, 2022, 157, 194902 

43. The Utilization of Polymer-Tethered Probes for the Assessment of Segmental Polymer Dynamics Near Glass Transition  

Hyangseok Lee,§ Dongwan Son,§ Soohyun Lee, Kyunghyun Eun, Myungwoong Kim,* and Keewook Paeng*

Macromolecules, 2022,  55, 8176−8185 

42. Improved Thermal Stability and Operational Lifetime of Blue Fluorescent Organic Light Emitting Diodes by using A Mixed Electron Transporting Layer 

Min Seok Ki,§ Myungsun Sim,§ Ohyun Kwon,*  Kyuhyun Im, Byoungki Choi,* Byeong Jun Cha, Young Dok Kim, Tae Young Jin, and Keewook Paeng*

ACS Materials Letters, 2022,  4, 1676−1683

41. A composite of carbon nanofiber/copper particle-anchored thiol incorporated silica nanoparticles utilizable for heavy metal adsorption 

Hoik Lee, Masaaki Murai, Dongwan Son, Seong-Geun Oh, Myungwoong Kim,* Keewook Paeng,*  and Ick Soo Kim,*

Composites Communications, 2022,  34, 101256  

40. Impact of Chain Conformation on Structural Heterogeneity in Polymer Network 

Hyeyoung Joung, Chanwoo Kim, Jaesang Yu, Soohyun Lee, Keewook Paeng,* and Jaesung Yang*

Nano Letters, 2022, 22, 13, 5487–5494 

39. Single molecule demonstration of Debye–Stokes–Einstein breakdown in polystyrene near the glass transition temperature

Nicole L. Mandel, Soohyun Lee, Kimyung Kim, Keewook Paeng*, and Laura J. Kaufman*

Nature Communications, 2022, 13,  3580 

38. Direct Observations of Segmental Dynamics at the Polymer–Substrate Interface Enabled by Localizing Fluorescent Probes with Polymer Brushes

Yura Chung,§ Jieun Nam,§ Dongwan Son, Hyangseok Lee, Myungwoon Kim*, and Keewook Paeng*    

Macromolecules, 2021, 54, 4546−4556

37. Thiol-Based Chemistry as Versatile Routes for the Effective Functionalization of Cellulose Nanofibers

Sol An, Bokyoung Jeon, Jong Hyuk Bae, Ick Soo Kim, Keewook Paeng*, Myungwoong Kim*, and Hoik Lee*    

Carbohydrate Polymers, 2019,  226, 115259

36. How Tethered Probes Report the Dynamics of a Polymer near the Glass transition

Jiwon Choi,§ Soohyun Lee,§ Jongwon Choe, Yura Chung, Yae Eun Lee, Jisu Kim, Myungwoon Kim*, and Keewook Paeng*     

ACS Macro Letters, 2019, 8, 1191-1186

35. Monolayer Behaviors of Carborane Poly(Ethylene Glycol) Complexes

Sunhye Kim, Jingying Yang, Eunsuk Jang, Keewook Paeng*, and Daewon Sohn*     

Bulletin of the Korean Chemical Society, 2019,  40, 230-235

34. Copolymerization of Simple Methacrylates by Cu(0)-Mediated Reversible Deactivation Radical Polymerization 

Jongwon Choe, Woo Jung Lee, Han Gyeol Jang, Youngjoo Song, Jae Hyun Sim, Jaewoo Kim, Keewook Paeng*, Myungwoong Kim*     

Polymer Journal, 2019, 51, 449-459

33. Characterization of porous microspheres prepared via γ-ray irradiation

Hyosin Kim, Jeong Rae Kim, Keewook Paeng*, and Daewon Sohn*    

Colloid and Polymer Science, 2018, 296(12), 2015-2023

32. Biphasic rate exchange in supercooled o-terphenyl from an ensemble analysis of single-molecule data

Harveen Kaur, Sachin Dev Verma, Keewook Paeng, Laura J. Kaufman*, and Mark A. Berg*    

Physical Review E, 2018, 98, 040603(R)

31. Segmental dynamics of polymer by rotational fluorescence correlation microscopy

Soohyun Lee, Jiwon Choi, Jongwon Choe, Myungwoong Kim*, and Keewook Paeng*    

Journal of Chemical Physics, 2018, 149, 164910

30. Which probes can report intrinsic dynamic heterogeneity of a glass forming liquid? 

Keewook Paeng,  and Laura J. Kaufman*   

Journal of Chemical Physics, 2018, 149, 164501

29. Reversible assembly of terpyridine incorporated norbornene-based polymer via ring-opening methathesis polymerization and its self-healing property

Jookyeong Lee, Hwi Hyun Moon, Keewook Paeng*,  and Changsik Song*   

Polymers, 2018, 10 (10), 1173

28. Effect of Film Deposition Parameters on the Glass Transition Behaviors of Poly(methyl methacrylate), Poly(ethyl methacrylate), and Poly(methyl methacrylate-random-ethyl methacrylate) Films

Woo Jung Lee, Jongwon Choe, Sunghyeon Ryu, Jeong Min Lim, Myungwoong Kim*,  Keewook Paeng*  

Thin Solid Films, 2018, 668, 56-62

27. A review of doping modulation in graphene

Hoik Lee,* Keewook Paeng,* Ick Soo Kim* 

Synthetic Metals, 2018, 244, 36-47

26. Epoxy-Containing Copolymers: A Versatile Toolbox for Functional Nanofiber Mats with Desired Chemical Functionalities

Hoik Lee, Sol An, Sukjoo Kim, Bokyoung Jeon, Keewook Paeng, Ick Soo Kim,* Myungwoong Kim*

Advanced Materials Interfaces, 2018, 5, 1800506

25. Stable polymer brushes with effectively varied grafting density synthesized from highly crosslinked random copolymer thin films

Hyungoo Kang, Sol An, Woo Jung Lee, Ga Ryang Kang, Sangwon Kim, Su-Mi Hur,* Keewook Paeng,*  and  Myungwoong Kim* 

RSC Advances, 2018, 8, 24166

24. Single molecule studies reveal temperature independence of lifetime of dynamic heterogeneity in polystyrene

Alyssa S. Manz, Keewook Paeng, and Laura J. Kaufman*

Journal of Chemical Physics, 2018, 148, 204508

23. Confocal rheology probes structure and mechanics of collagen through the sol-gel transition

Khansh-Hoa Tran-Ba, Daniel J. Lee, Jieling Zhu, Keewook Paeng, and Laura J. Kaufman*

Biophysical Journal, 2017, 113, 1882-1892

22. The spatial arrangement of a single nanoparticle in a thin polymer film and its effect on the nanoparticle diffusion

Hesang Im, Younghoon Oh, Hyun Woo Cho, Jeongmin Kim, Keewook Paeng and Bong June Sung*

Soft Matter, 2017, 13, 5897-5904

21. Single Molecule Experiments Reveal the Dynamic Heterogeneity and Exchange Time Scales of Polystyrene near the Glass Transition

Keewook Paeng and Laura J. Kaufman*

Macromolecules, 2016, 49, 2876-2885

20. In Situ Multi-modal Monitoring of Solvent Vapor Swelling in Polymer Thin Films

Dat Tien Hoang, Jaesung Yang, Keewook Paeng, Youngah Kwon, Oh Sang Kweon, and Laura J. Kaufman*

Review of Scientific Instruments, 2016, 87, 015106

19. Conformation-Dependent Photostability among and within Single Conjugated Polymers

Heungman Park; Dat Tien Hoang, Keewook Paeng, Jaesung Yang and Laura J. Kaufman*

Nano Letters, 2015, 15 (11), 7604-7609

18. Ideal probe single molecule experiments reveal the intrinsic dynamic heterogeneity of a supercooled liquid

Keewook Paeng, Heungman Park , Dat Tien Hoang, and Laura J. Kaufman*

Proceedings of the National Academy of Sciences, 2015, 112 (16), 4952-4967

17. Localizing Exciton Recombination Sites in Conformationally Distinct Single Conjugated Polymers by Super-Resolution Fluorescence Imaging

Heungman Park, Dat T. Hoang, Keewook Paeng, and Laura J. Kaufman*

ACS nano, 2015, 9 (3) 3151-3158

16. Extraction of Rotational Correlation Times from Noisy Single Molecule Fluorescence Trajectories

Dat Tien Hoang, Keewook Paeng, Heungman Park, Lindsay M. Leone, and Laura J. Kaufman*

Analytical Chemistry, 2014, 86 (18), 9322–9329

15. Fast crystal growth from organic glasses: comparison of o-terphenyl with its structural analogs

C. Travis Powell, Keewook Paeng, Zhen Chen, Ranko Richert, Lian Yu, and M. D. Ediger*

Journal of Physical Chemistry B, 2014, 118 (28), 8203–8209

14. Single Molecule Rotational Probing of Supercooled Liquids

Keewook Paeng and Laura J. Kaufman*

Chemical Society Reviews, 2014, 43, 977-989

13. Fast crystal growth induces mobility and tension in supercooled o-terphenyl

Keewook Paeng, C. Travis Powell, Lian Yu, and M. D. Ediger*

Journal of Physical Chemistry Letters, 2012, 3, 2562

12. Molecular mobility in supported polymer thin films of polystyrene, poly(methyl methacrylate), and poly(2-vinyl pyridine) probed by dye reorientation

Keewook Paeng, Ranko Richert, and M. D. Ediger*

Soft Matter, 2012, 8, 819

11. Molecular motion in freestanding thin films of poly(methyl methacrylate), poly(4-tert-butyl styrene), poly(α-methyl styrene), and poly(2-vinyl pyridine)

Keewook Paeng and M.D. Ediger*

Macromolecules, 2011, 44, 7034

10. Direct measurement of molecular motion in freestanding polystyrene thin films

Keewook Paeng, Stephen F. Swallen, and M.D. Ediger*

Journal of the American Chemical Society, 2011, 133, 8444

9. Temperature ramping dye reorientation measurement as a probe of molecular dynamics in polymer glasses

Keewook Paeng, Hau-Nan Lee, Stephen F. Swallen, and M. D. Ediger*

Journal of Chemical Physics, 2011, 134, 024901

8. Molecular mobility of PMMA glass during uniaxial tensile creep deformation

Hau-Nan Lee, Keewook Paeng, Stephen F. Swallen, M. D. Ediger*, Rebecca A. Stamm, Grigori A. Medvedev, and James M. Caruthers

Journal of Polymer Science Part B: Polymer Physics, 2009, 47 (17), 1713-1727

7. Direct measurement of molecular mobility in actively deformed polymer glasses

Hau-Nan Lee, Keewook Paeng, Stephen F. Swallen, and M. D. Ediger*

Science, 2009, 323, 231

6. Dye reorientation as a probe of stress-induced mobility in polymer glasses 

Hau-Nan Lee, Keewook Paeng, Stephen F. Swallen, and M. D. Ediger*

Journal of Chemical Physics, 2008, 128, 134902

5. Supramolecular ordering of tripod dyes at the air/water interface 

Sang-Gil Youm, Keewook Paeng, Young-Wook Choi, Sungjin Park, Daewon Sohn*, Young-Soo Seo, Sushil K. Satija, Bong Gi Kim, Sehoon Kim, and Soo Young Park

Langmuir, 2005, 21(13), 5647-5650

4. Temperature effect of hydrophobically modified poly ethylene oxide at the air-water interface 

Keewook Paeng, Jinwoo Choi, Youngmi Park, and Daewon Sohn*

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2003, 220, 1

3. Molecular weight effect on behaviors of polystyrene-block-poly(methyl methacrylate) diblock copolymers at air/water interface

Yongsok Seo*, Keewook Paeng, and Sangwook Park

Macromolecules, 2001, 34, 8735

2. Aggregation processes of hydrophobically modified polyethylene oxide 

Keewook Paeng, Bum-Sung Kim, Eung-Ryul Kim, and Daewon Sohn*

Bulletin of the Korean Chemical Society, 2000, 21(6), 623

1. Adsorption of poly(γ-substituted α, L-glutamate) on aluminum surface: ATR and MO approaches

Keewook Paeng, Hyun Joo, Pilsoo Kang, Jaebum Choo, and Daewon Sohn*

Molecular Crystals and Liquid Crystals, 2000, 349, 155