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) Book Chapters
: Our group has published two book chapters about conjugated polymer-based energy applications.


(1) Adv. Mater. 2023, 35, 2210749.
"Rapid and Direct Liquid-Phase Synthesis of Luminescent Metal Halide Superlattices"

A straightforward strategy to rapidly and directly crystallize luminescent metal halide nanocrystals into close-packed face-centered-cubic (FCC) superlattices during the liquid-phase synthesis is demonstrated. The concomitant nanocrystal growth and superlattice formation process is governed by the interplay between the nanocrystal size and surface-coating ligand.
(2) Nature Commun. 2020, 11, 1324.
"Electrical Monitoring of Photoisomerization of Block Copolymers Intercalated into Graphene Sheets"

Insulating polymers have received little attention in electronic applications. Here, we synthesize a photoresponsive, amphiphilic block copolymer (PEO-b-PVBO) and further control the chain growth of the block segment (PVBO) to obtain different degrees of polymerization (DPs). The benzylidene oxazolone moiety in PEO-b-PVBO facilitated chain-conformational changes due to photoisomerization under visible/ultraviolet (UV) light illumination. Intercalation of the photoresponsive but electrically insulating PEO-b-PVBO into graphene sheets enabled electrical monitoring of the conformational change of the block copolymer at the molecular level. The current change at the microampere level was proportional to the DP of PVBO, demonstrating that the PEO-b-PVBO-intercalated graphene nanohybrid (PGNH) can be used in UV sensors. Additionally, discrete signals at the nanoampere level were separated from the first derivative of the time-dependent current using the fast Fourier transform (FFT). Analysis of the harmonic frequencies using the FFT revealed that the PGNH afforded sawtooth-type current flow mediated by Coulomb blockade oscillation.

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

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