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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) 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) Guest Editor, Applied Sciences
: Prof. Yoon now serves as a Guest Editor for a Special Issue "Recent Trends in Polymer Nanoscience and Nanotechnology" in Applied Sciences. Visit the website "http://www.mdpi.com/journal/applsci/special_issues/Polymer_Nano".

(3) Our recent work about "nanofiber filter for microdust capturing" was introduced in the media
: Money Today, Dong-A Science, Chosun Biz, etc.
:Visit the website "http://hellodd.com/?md=news&mt=view&pid=64538"

 


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(1) Biosens. Bioelectron. 2018, 105, 151-158.
"Fast and sensitive near-infrared fluorescent probes for ALP detection and 3d printed calcium phosphate scaffold imaging in vivo"

    

Alkaline phosphatase (ALP) is a critical biological marker for osteoblast activity during early osteoblast differentiation, but few biologically compatible methods are available for its detection. Here, we describe the discovery of highly sensitive and rapidly responsive novel near-infrared (NIR) fluorescent probes (NIR-Phos-1, NIR-Phos-2) for the fluorescent detection of ALP. ALP cleaves the phosphate group from the NIR skeleton and substantially alters its photophysical properties, therefore generating a large “turn-on” fluorescent signal resulted from the catalytic hydrolysis on fluorogenic moiety. Our assay quantified ALP activity from 0 to 1.0 U/mL, showing a response rate completed within 1.5 min. A potentially powerful approach to probe ALP activity in biological systems demonstrated real-time monitoring using both concentration- and time-dependent variations of endogenous ALP in live cells and animals. Based on high binding affinity to bone tissue of phosphate moiety, bone-like scaffold-based ALP detection in vivo was accessed using NIR probe-labeled three-dimensional (3D) calcium deficient hydroxyapatite (CDHA) scaffolds. They were subcutaneously implanted into mice and monitored ALP signal changes using a confocal imaging system. Our results suggest the possibility of early-stage ALP detection during neo-bone formation inside a bone defect, by in vivo fluorescent evaluation using 3D CDHA scaffolds.
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(2) Chem. Eng. J. 2018, 339, 204.
"Surface-Modified Polymer Nanofiber Membrane for High-Efficiency Microdust Capturing"

    

Particulate matter (PM) pollution is serious human health issue. Various filter technologies have been developed to improve the air filtration efficiency. Recently, nanofibrous membrane filters have received much attention due to its outstanding transparency and high efficiency for PM ≤ 2.5 μm (PM2.5) capture/removal compared to conventional micro-structured filters. Although these filters provide high-efficiency PM2.5 capture, obtaining strong PM adhesion via surface engineering remains a challenge. In this study, we demonstrate a high efficiency PM2.5 capture air-filter by electrospun polyacrylonitrile nanofibers (EPNFs). The surface of the EPNFs was modified by oxygen plasma treatment for generating functional groups. The EPNFs were utilized as air filter in hand-made PM removal system which is consisted of DC power supply, PM source, PM sensor and PM removal test chamber. The test result showed high air flow and effective air filtration (PM2.5 removal efficiency: 94.02%, pressure drop: 18 Pa, Time to reach the PM level recommended by the World Health Organization compared to commercial filters. The intermolecular interaction between the plasma-treated EPNFs (PEPNFs) and PMs was investigated by density functional theory (DFT) calculations. The PEPNF filter showed high long-term reproducibility in a cycle test with a high PM concentration. The filter was applied as a car interior air purifier using a cigar jack as a power supply, ca. 16 min was required to reach the PM level recommended by the World Health Organization.
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School of Polymer Science & Engineering, 77 Yongbong-ro, Buk-gu, Gwangju 61186, South Korea

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