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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: Chem. European J. 2020, 26, 6360-6401.
"Exfoliation of 2D Materials for Energy and Environmental Applications"

The fascinating properties of single‐layer graphene isolated by mechanical exfoliation have inspired extensive research efforts toward two‐dimensional (2D) materials. Layered compounds serve as precursors for atomically thin 2D materials (briefly, 2D nanomaterials) owing to their strong intraplane chemical bonding but weak interplane van der Waals interactions. There are newly emerging 2D materials beyond graphene, and it is becoming increasingly important to develop cost‐effective, scalable methods for producing 2D nanomaterials with controlled microstructures and properties. The variety of developed synthetic techniques can be categorized into two classes: bottom‐up and top‐down approaches. Of top‐down approaches, the exfoliation of bulk 2D materials into single or few layers is the most common. This review highlights chemical and physical exfoliation methods that allow for the production of 2D nanomaterials in large quantities. In addition, remarkable examples of utilizing exfoliated 2D nanomaterials in energy and environmental applications are introduced.
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School of Polymer Science & Engineering, 77 Yongbong-ro, Buk-gu, Gwangju 61186, South Korea

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