Welcome to Yoon Research Group~!!
If you have any questions, feel free to contact me at hyoon(a)chonnam.ac.kr

Research in our group focuses on rational design, synthesis, and
applications of functional nanomaterials which mainly consist of
conducting polymers, carbon nanotubes, and graphene.

본 연구실은 기능성 나노재료의 디자인, 합성 및 응용에 관한 연구를
중점적으로 진행하고 있습니다.

1) 전도성 고분자, 탄소 나노튜브, 그래핀으로 구성된 나노재료의
구조 및 물성 제어
2) 열/전기 전도, 접착, 부식방지 특성의 기능성 고분자 나노복합재료
제조, 분석 및 응용
3) 전자 장치, 화학/바이오 센서 및 각종 에너지 분야에서 기존 장치의
성능 향상 또는 신개념의 장치 개발

(1) Global Ph.D. Fellowship
Chul Soon receives Global Ph.D. Fellowship from the National Research Foundation of Korea. The fellowship supports outstanding graduate students to nuture world-class academics and researchers in South Korea. This year, 200 students were selected from more than 1,000 applicants.

(2) Editorial Board Member, Scientific Reports
: Prof. Yoon has been invited to serve as an Editorial Board Member for Scientific Reports, a journal from Nature Publishing Group. Visit the website "http://www.nature.com/srep/eap-ebm/index.html".

(3) Our heavy metal sensors article has been selected as a "Hot Article"
: Visit the Analyst Blog "http://blogs.rsc.org/an/category/hot-article/"


(1) ACS Appl. Mater. Interfaces. 2017, 9, 10768.
"Graphene-Embedded Hydrogel Nanofibers for Detection and Removal of Aqueous-Phase Dyes"


A facile route to graphene/polymer hydrogel nanofibers was developed. An aqueous dispersion of graphene (containing >40% bilayer graphene flakes) stabilized by a functionalized water-soluble polymer with phenyl side chains was successfully electrospun to yield nanofibers. Subsequent vapor-phase cross-linking of the nanofibers produced graphene-embedded hydrogel nanofibers (GHNFs). Interestingly, the GHNFs showed chemical sensitivity to the cationic dyes methylene blue (MB) and crystal violet (CV) in the aqueous phase. The adsorption capacities were as high as 0.43 and 0.33 mmol/g.s for MB and CV, respectively, even in a 1.5 mL/s flow system. A density functional theory calculation revealed that aqueous-phase MB and CV dyes were oriented parallel to the graphene surface and that the graphene/dye ensembles were stabilized by secondary physical bonding mechanisms such as the π–π stacking interaction in an aqueous medium. The GHNFs exhibited electrochemical properties arising mainly from the electric double-layer capacitance, which were applied in a demonstration of GHNF-based membrane electrodes (5 cm in diameter) for detecting the dyes in the flow system. It is believed that the GHNF membrane can be a successful model candidate for commercialization of graphene due to its easy-to-fabricate process and remarkable properties.
(1) Biosens. Bioelectron. 2017, 89, 919.
"A Near-Infrared "Turn-On" Fluorescent Probe with a Self-Immolative Linker for the In Vivo Quantitative Detection and Imaging of Hydrogen Sulfide"


Hydrogen sulfide is a critical biological messenger, but few biologically compatible methods are available for its detection in vivo. Here, we describe the design and synthesis of a novel azide-functionalized near-infrared probe, NIR-Az, for a hydrogen sulfide assay in which a self-immolative linker is incorporated between the azide moiety and phenolic dihydroxanthene fluorophore from a cyanine dye. A large “turn-on” near-infrared fluorescence signal results from the reduction of the azide group of the fluorogenic moiety to an amine, in which the self-immolative linker also enhances the accessibility of NIR-Az to hydrogen sulfide. NIR-Az can select hydrogen sulfide from among 16 analytes, including cysteine, glutathione, and homocysteine. By exploiting the superior properties of NIR-Az, such as its good biocompatibility and rapid cell internalization, we successfully demonstrated its usefulness in monitoring both the concentration- and time-dependent variations of hydrogen sulfide in living cells and animals (detection limit less than 0.26 μM), thereby providing a powerful approach for probing hydrogen sulfide chemistry in biological systems.

School of Polymer Science & Engineering, 77 Yongbong-ro, Buk-gu, Gwangju 61186, South Korea

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