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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


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(1) Our recent "Block copolymer/graphene" work was introduced in the media, Veritas, Kyosu-net, etc. See also the story behind the paper in Nature Research Chemistry Community "Non-conductive polymers for electronics and optoelectronics?", Mar./15/2020.

(2) Associate Editor
: Prof. Yoon now serves as an Associate Editor for the journal Polymers (impact factor 3.164).

 


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(1) Nat. 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.
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(2) Invited Reveiw Article: Carbon 2019, 152, 796-817.
"Strategies for Fabricating Versatile Carbon Nanomaterials from Polymer Precursor"

There has been a continuous pursuit toward developing techniques used to prepare enhanced carbon nanomaterials over the last several decades. In particular, the demand for new and advanced carbon nanomaterials is related to the need to optimize their physicochemical characteristics for specific applications. In this regard, polymer precursors have great potential for fabricating nanostructured carbons with desirable properties since the chemical structure and surface/interface properties of the polymer can be designed and tailored during the preparation process. Various types of polymers including synthetic polymers, natural polymers, and biomass have been investigated as carbon precursors. Elaborate efforts have been made to prepare polymer nanoparticles, polymer blends, and nanocarbon/polymer hybrids for versatile carbon nanomaterials via heat treatment processes, for which knowledge and technologies regarding the interface and polymer chemistry/physics are required. In addition, more in-depth studies into the carbonization mechanism may lead to various strategies for creating advanced carbon nanomaterials with desirable properties.
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School of Polymer Science & Engineering, 77 Yongbong-ro, Buk-gu, Gwangju 61186, South Korea

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