Our group is affiliated with department of Chemistry and Division of Advanced Materials Science, graduate program in POSTECH.

 Our group research focuses on the development of new functional materials through the growth and property studies of functional molecular crystals and molecular network systems as they provide enormous opportunities for the success considering the unlimited number of target molecules, and the intrinsic property of molecular crystal that frequently exhibit new properties upon crystallization, different from those of the original molecules. More specifically, we are interested in growing crystals of molecules that are electrically, optically active to eventually apply them in various applications, such as energy conversion systems, next generation semiconductors, superconductors, etc. We are also interested in their property changes depending on their morphologies, and upon dimension scales spanning from nano to micron sizes. We also challenge important hurdles present in conventional nanoscale materials including carbon nanotubes, graphene, and 2D metal dichalcogenides, etc. Molecular network systems embrace molecule-backboned materials including metal organic frameworks (MOFs) and covalent organic frameworks (COFs), of which properties could be varied upon the selection of molecular component. Our contribution in this subject is to develop synthetic methods for their formation into various dimensions, especially, in one- or two-dimensions. Our ultimate goal for the research on molecular network systems is to rebuild traditional inorganic solid state network systems into pure molecular network systems.

 In this regard, we have been working on following specific subjects:

2D COF

C70  Cube

1. Development of various crystal growth methods in all possible phases, from traditional solution phase to vapor phase reactions.

2. Fabrication of molecular crystal electrical devices to examine their electrical/optical properties.

3. Crystallographic and spectroscopic analyses to understand the property changes upon crystallization & the structure-property correlation using the Synchrotron facility on campus (Pohang Accelerator laboratory, PAL) as well as lab-equipped spectrometers.

4. Development of efficient alkali metal doping methods for the studies of higher conducting molecular crystal systems as well as superconducting molecular systems.

5. Development of synthetic methods for 1D, 2D MOFs, COFs.

6. Reconstruction of inorganic network systems using soft molecules. 

7. Understanding the growth mechanism of 2D materials on solid catalyst substrates.

News

  • Youngkwan's paper entitled "Selective growth of α-form zinc phthalocyanine nanowire crystals through flow rate control of physical vapor transport method." has been accepted in NPG Asia Mater. Congratulations! 2020.01.06

  • Taekyung's paper entitled "High Yield Organic Superconductors via Solution-Phase Alkali Metal Doping at Room Temperature." has been accepted in Nano Lett. Congratulations! 2019.12.18

  • Soyoung's review paper entitled " Recent Advances in Covalent Organic Frameworks for Molecule-Based Two-Dimensional Materials." has been accepted in ACS omega. Congratulations! 2019.12.17

  • Soyoung reveived a IKM Oral Prize at the ACCC7. Congratulations! 2019.10.17

  • Hye Soo reveived a Praf Lars Book Prize at the ACCC7. Congratulations! 2019.10.16

  • Myeonggeun received a Dalton Transactions Young Coordination Chemist Poster Prize at the ACCC7. Congratulations! 2019.10.16

  

  • Yohwan's paper entitled "Spontaneous Formation of Gold Nanoparticles on Graphene by Galvanic Reaction through Graphene​" has been accepted in ACS Omega. Congratulations! 2019.10.14

  • Jinho's paper entitled "Exfoliated Graphite Electrodes for Organic Single Crystal Field Effect Transistor Device​" has been accepted in ACS Appl. Electron. Mater. Congratulations! 2019.09.10

  • Soyoung (Dr. Kim) was selected as an interviewee of the academy activity support for female researchers at WISET. 2019.08.28 <Link>

* WISET: The Korea Center for Women in Science, Engineering, and Technology

  • Soyoung (Dr. Kim) has successfully defended her Ph. D. thesis.

       Congratulations! 2019.06.12

  • Jinho (Dr. Lee) has successfully defended his Ph. D. thesis.

       Congratulations! 2019.06.12

  • Jiwon and Jinyoung's paper entitled "Efficient approach to modulate the coordination number of yttrium ion for diverse network formation." has been accepted in CrystEngComm. Congratulations! 2019.06.10

  • Soyoung's paper entitled "Light-Promoted Synthesis of Highly-Conjugated Crystalline Covalent Organic Framework." has been accepted in Commun. Chem. Congratulations! 2019.05.10

  • Jinho and Chibeom's paper entitled "Position-selective solution phase growth of fullerene crystals" has been accepted in Carbon. Congratulations! 2019.01.04

  • ​Taeyeon and Jinyoung's paper entitled "Surface-Mediated Recrystallization for Highly Conducting Organic Radical Crystal" has been accepted in Cryst. Growth Des. Congratulations! 2019.01.03

  • Yohwan's paper is selected as the cover of Cryst. Growth Des. Congratulations! 2018.12.05\

  • ​Intek's paper entitled "Revealing the Role of Gold in the Growth of Two-dimensional Molybdenum Disulfide by Surface Alloy Formation" has been accepted in Chem. Eur. J. Congratulations! 2018.11.29

  • Yohwan's paper entitled "Additive-free Morphology Control of Organic Polyhedral Molecular Crystals by the Anti-solvent Molecular Geometry: from Rod, Disk to Cube" has been accepted in Cryst. Growth Des. Congratulations! 2018.11.08

Recent Publications

  • Yoon, Y.; Kim, S.; Choi, H. C. NPG Asia Mater. 2020, 12, 16. Selective growth of α-form zinc phthalocyanine nanowire crystals through flow rate control of physical vapor transport method.

  • Yoon, T.; Koo, J. Y.; Choi, H. C. Nano Lett. 2020, 20, 612-617. High Yield Organic Superconductors via Solution-Phase Alkali Metal Doping at Room Temperature.

  • Kim, S.; Choi, H. C. ACS Omega 2019, accepted. Recent Advances in Covalent Organic Frameworks for Molecule-Based Two-Dimensional Materials. <Review Paper>

  • Park, Y.; Koo, J. Y.; Kim, S.; Choi, H. C. ACS Omega 2019, 4, 18423–18427. Spontaneous Formation of Gold Nanoparticles on Graphene by Galvanic Reaction through Graphene. <Supplementary Cover>

  • Kim, S.; Choi, H. C. Commun. Chem. 2019, 2, 60. Light-Promoted Synthesis of Highly-Conjugated Crystalline Covalent Organic Framework.

  • Park, C.#; Lee, J.#; Lee, M.;Yoon, T.; Choi, H. C. Carbon  2019, 145, 31-37. Position-selective solution phase growth of fullerene crystals. (# these authors contributed equally to this work)

  • Kwon, T.#; Koo, J. Y.#; Choi, H. C. Cryst. Growth Des. 2019, 19, 2, 551-555. Surface-Mediated Recrystallization for Highly Conducting Organic Radical Crystal. (# these authors contributed equally to this work)

  • Song, I.; Choi, H. C. Chem. Eur. J. 2019, 25, 1337–2344. Revealing the Role of Gold in the Growth of Two‐dimensional Molybdenum Disulfide by Surface Alloy Formation. (Appears in Hot Topic: Gold)

  • Kim, S.; Lim, H.; Lee, J.; Choi, H. C. Langmuir  2018,  34, 8731–8738. Synthesis of a Scalable Two-Dimensional Covalent Organic Framework (COF) by Photon-assisted Imine Condensation Reaction on the Water Surface.

Nanoscale Materials Research Laboratory

Department of Chemistry, Pohang University of Science and Technology (POSTECH)

Tel (Lab) : 82-54-279-5524, 82-54-279-8156 / Fax : 82-54-279-8127