A Nonchlorinated Solvent-Processable Fluorinated Planar Conjugated Polymer for Flexible Field-Effect Transistors

Lee, Myeongjae,Kim, Min Je,Ro, Suhee,Choi, Shinyoung,Jin, Seon-Mi,Nguyen, Hieu Dinh,Yang, Jeehye,Lee, Kyung-Koo,Lim, Dong Un,Lee, Eunji,Kang, Moon Sung,Choi, Jong-Ho,Cho, Jeong Ho,Kim, BongSoo American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.34

<P>High carrier mobilities have recently been achieved in polymer field effect transistors (FETs). However, many of these polymer FET devices require the use of chlorinated solvents such as chloroform (CF), chlorobenzene (CB), and odichlorobenzene (DCB) during fabrication. The use of these solvents is highly restricted in industry because of health and environmental issues. Here, we report the synthesis of a low band gap (1.43 eV, 870 nm) semiconducting polymer (PDPP2DT-F2T2) having a planar geometry, which can be readily processable with nonchlorinated solvents such as toluene (TOL), o-xylene (XY), and 1,2,4-trimethylbenzene (TMB). We performed structural characterization of PDPP2DT-F2T2 films prepared from different solvents, and the electrical properties of the films were measured in the context of FETs. The devices exhibited an ambipolar behavior with hole dominant transport. Hole mobilities increased with increasing boiling point (bp) of the nonchloririated solvents: 0.03, 0.05, and 0.10 cm(2) V-1 s' for devices processed using TOL, XY, and TMB, respectively. Thermal annealing further improved the FET performance. TMB-based polymer FETs annealed at 200 degrees C yielded a maximum hole mobility of 1.28 cm(2) s(-1), which is far higher than the 0.43 cm(2) V-1 s(-1) obtained from the CF-based device. This enhancement was attributed to increased interchain interactions as well as improved long-range interconnection between fibrous domains. Moreover, all of the nonchlorinated solutions generated purely edge-on orientations of the polymer chains, which is highly beneficial for carrier transport in FET devices. Furthermore, we fabricated an array of flexible TMBprocessed PDPP2DT-F2T2 FETs on the plastic PEN substrates. These devices demonstrated excellent carrier mobilities and negligible degradation after 300 bending cycles. Overall, we demonstrated that the organized assembly of polymer chains can be achieved by slow drying using high bp nonchlorinated solvents and a post thermal treatment. Furthermore, we showed that polymer FETs processed using high bp nonhalogenated solvents may outperform those processed using halogenated solvents.</P>

A Study on the Methodology for Predicting the Generation of Solar Wasted Panels Using a Lifespan Curve

Suhee Lee,Jong-Min Park,Sook-Kyung Lee 한국신재생에너지학회 2021 AFORE Vol.2021 No.10

How much solar panel waste would be generated in South Korea?: application of population balance model (PBM)

( Suhee Lee ),( Yong-chul Jang ),( Byeonghwan Kim ),( Youngsun Kwon ),( Hakyun Song ),( Kyunghoon Choi ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-

As the demand of renewable energy keeps growing, the installation of solar panels has been increased in the world. Once life-span of solar panels is reached, end-of-life of solar panels or solar panel waste can be generated for waste management. Environmentally sound management of solar panel waste has become an issue of concern around the world because they contain valuable materials as well as toxic pollutants upon disposal. This study examines the estimation of solar panel waste by using population balance model by 2050 in South Korea. The lifespan distribution analysis of solar panels was based on the literature with the Weibull distribution. Based on the results in this study, we found that solar panel waste in 2040 is estimated to be approximately 76,000 ton in South Korea, consisting of 57,000 ton of glass, 7,600 ton of polymers, 6,000 ton of aluminium, 3,800 ton of silicon, and other metals (silver, tin, and lead) for disposal. By 2050, approximately 1.7 million ton of solar panel waste would be accumulatively generated with continued annual increase. Material recycling and recovery from the waste should be implemented for resource conservation towards a circular economy. Refined estimation of the solar panel waste is still needed by conducting sensitive analysis with more reliable data such as its life spans, demands for solar panels, and mass of panel types.

Modification of cysteine 457 in plakoglobin modulates the proliferation and migration of colorectal cancer cells by altering binding to E-cadherin/catenins

Kim, Suhee,Ahn, Sun Hee,Yang, Hee-Young,Lee, Jin-Sil,Choi, Hyang-Gi,Park, Young-Kyu,Lee, Tae-Hoon Informa UK (TaylorFrancis) 2017 Redox report Vol.22 No.6

<P>Discussion: Pg appears to be redox-sensitive in cancer, and the C457 modification may impair cell migration and proliferation by affecting its interaction with the E-cadherin/catenin axis. Our findings suggest that redox-sensitive cysteines of Pg may be the targets for CRC therapy.</P>

유아교사의 직무 스트레스, 학부모와의 관계, 사회적 지지가 소진에 미치는 영향

이수희(Suhee Lee),차정주(Jungju Cha) 한국어린이미디어학회 2022 어린이미디어연구 Vol.21 No.1

본 연구는 유아교사의 직무 스트레스와 학부모와의 관계, 사회적 지지가 그들의 소진에 미치는 영향을 알아보기 위한 목적으로 이루어졌다. 이를 위하여 대구, 경북 지역 유아교사 205명을 대상으로 약 3주간 비대면 설문을 실시하고, 설문 자료를 토대로, 기술통계 분석, 상관관계 분석, 중다회귀분석을 실시하였다. 분석을 통해 도출된 결과를 제시하면 다음과 같다. 첫째, 유아교사의 직무 스트레스, 학부모와의 관계, 사회적 지지, 소진 사이의 상관관계를 분석한 결과 유아교사의 직무 스트레스는 그들의 학부모와의 관계, 사회적 지지와 유의미한 부적 상관을 가지고, 소진과는 유의미한 정적 상관을 가지고 있었다. 둘째, 유아교사의 직무 스트레스, 학부모와의 관계, 사회적 지지가 소진에 미치는 영향을 탐색하기 위해 중다회귀분석을 실시한 결과, 직무 스트레스, 학부모와의 관계, 사회적 지지 모두 그들의 소진에 유의한 영향을 미치는 것으로 나타났다. 본 논문은 유아교사의 소진을 예방하기 위해 그들의 직무 스트레스를 최소화하고, 학부모와의 관계에서 발생하는 부정적 감정 소모를 감소시키기 위한 정책적 지원과 더불어 주변 및 조직의 지지 형성을 위한 사회적인 지원도 필요함을 시사한다. This research examines the relationships among job stress, human relation with parent, social support, and burnout of early childhood teachers. An untact survey mehtod is employed to collect data from 205 early childhood teachers who have worked in Daegu and Gyeongbuk. Based on multiple regression analysis, the result indicates that the four variales used in this research are significantly correlated. Job stress, human relation with parent, and social support have statistically significant impacts on their burnout. In other words, it turns out that job stress, human relation with parent, and social support are critical variables in explaining the burnout of early childhood teachers. Based on the research findings, this research suggests that the job stress of early childhood teachers should be reduced and human relation with parent and social support should be encouraged for preventing their burnout. Additionally, they need to learn how to redece their job stress, how to manage relation with parents, and how to attain social support if they are to avoid burnout.

A Study on the Development of Interview Procedure for HSA at Kori Unit 1

Donghee Lee,Wook Sohn,Sukbon Yoon,Suhee Lee 한국방사성폐기물학회 2018 한국방사성폐기물학회 학술논문요약집 Vol.2018 No.05

An aptamer-aptamer sandwich assay with nanorod-enhanced surface plasmon resonance for attomolar concentration of norovirus capsid protein

Kim, Suhee,Lee, Sanghyuk,Lee, Hye Jin Elsevier 2018 Sensors and actuators. B Chemical Vol.273 No.-

<P><B>Abstract</B></P> <P>A Gold nanorod (NR) enhanced surface sandwich assay utilizing a novel pair of aptamers for the attomolar concentration of norovirus (NoV) capsid protein was developed in conjunction with surface plasmon resonance (SPR). A total of four different DNA aptamer sequences (aptamer I-IV) known to be specific for the NoV protein were examined using SPR for individual binding strength with the NoV protein and for the formation of surface sandwich with the NoV protein, meaning that the chosen aptamer pair possesses different binding epitope towards the NoV protein. One of the aptamer (aptamer II) sequences with the strongest binding constant was covalently tethered onto a chemically modified thin gold chip surface, while the other aptamer I was used for tethering onto the Au NR surface. The surface sandwich complex was formed via the sequential adsorption of NoV capsid protein and Au NR coated aptamer I onto the aptamer II surface. As low as a 70 aM concentration of the NoV protein in buffer solution could be detected, which is 10<SUP>5</SUP> times better than that of using the aptamer-aptamer sandwich platform without any gold NR particles. As a demonstration, the aptamer-NR coated aptamer sandwich assay was applied to analyze NoV capsid protein concentrations spiked in human serum solutions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly sensitive and selective surface sandwich bioassays for norovirus (NoV) capsid protein. </LI> <LI> A pair of DNA aptamer bioreceptors for enhancing the selectivity of NoV capsid protein sensing. </LI> <LI> Gold nanorod-DNA aptamer conjugates to improve the sensitivity for NoV capsid protein sensing. </LI> <LI> Direct analysis of NoV capsid protein concentrations in undiluted human serum samples. </LI> <LI> A lowest detectable concentration of 50 aM NoV capsid protein. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Synthesis and photovoltaic property of copolymers with phenanthrothiadiazole moiety

Song, Suhee,Park, Seijung,Kwon, Sooncheol,Lee, Byoung Hoon,Shim, Joo Young,Lee, Jongjin,Park, Sung Heum,Jin, Youngeup,Kim, Il,Lee, Kwanghee,Suh, Hongsuk Elsevier 2012 Solar energy materials and solar cells Vol.105 No.-

골조직 재생을 위한 3차원 PCL/HA 인공지지체 개발

이수희(Lee SuHee),박수아(Park SuA),이준희(Lee Jun-Hee),김효주(Kim HyoJoo),김완두(Kim Wan Doo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11

Recently, three-dimensional (3D) scaffold of tissue engineering was developed by rapid prototyping (RP) technology. 3-D scaffold of RP technology provide interconnective structure for cell growth and tissue regeneration. Also, it can control the pore size and porosity using the 3D-plotting system. In this research, we fabricated hybrid scaffold of polycaprolactone PCL) and hydroxyapatite (HA) for bone tissue engineering. We used scanning electron microscopy (SEM) to observe the surface of the scaffold. To characterize the scaffold, mechanical property and cell proliferation was measured.

주글론을 이용한 모발의 염색성

이수희(Lee SuHee) 한국뷰티산업학회 2006 뷰티산업연구 Vol.1 No.1

Currently, the interest in a natural hair dying are dramatically increased due to the problems of environment. A natural hair dye has features as like antibiosis, deodorizing, anti-allergy, and anti-cancer, despite of those multi-functional features are proven by hair-dying, the lack of colure range, the difficulties of securing and custody, low dye concentration, reproducibility, lightfastness and other low all sorts fastness are critical problems. Additionally, the complexity for way of dying gives more difficulties of being practical. The conquest of problems are instantly required the developing of moderate and various natural hair-dye stuffs and the researching of simple way of hair-dying. According to a research paper, juglone which is a main ingredient of wall-nut shell shows high rate of dying for wool. The research for possibility of using the juglone as a hair-dyes which could lead the same results. The bleaching was demanded before dying. Also, the variation for properties of matter and a form of hair in each conditions of dying was examined. Also, the variation of the rate of dying, the tone of colure and tensile intensity by dying conditions are examined. Finally, the variation of colour by a Fe mordant are researched. The consequence of this research show us that the best bleaching conditions for natural hair-dying are beaching in 50⁰C during 10minutes, with 9% density of H2O2. dye hair tensile strength because dip dyeing effect of hair damage. The longer dying time shows more rate of coloration. The higher density of dystuff give the hair low of colour shade and dark of color tone. The treatment of a Fe mordant lead the dark more darkness of tone of hair color. 최근 환경문제로 천염염색에 관심은 더욱 고조되고 있다. 천연염료는 항균성, 소취성, 항 알레르기성, 항암성 등을 지니고 있어 염색에 의하여 다양한 기능성을 부여할 수 있는 특성에도 불구하고 합성염료에 비해 색상이 다양하지 못하고 재료의 지속적 인 확보와 보관이 어려우며 낮은 염착력과 재현성, 일광견뢰도를 비롯한 제반 견뢰도가 낮은 것이 문제점이다. 또한 염색법이 복잡하여 실용화의 어려움을 지니고 있다. 이러한 문제점을 극복하기 위해서는 저렴하고 다양한 색상의 염재 발굴과 간편한 염 법에 의한 천연염료의 연구개발이 시급하다. 연구보고서에 따르면 호도외피의 주성 분인 주글론이 양모에 높은 염착량을 보였는데 이 결과가 모발에도 같은 결과가 나오는지 주글론의 모발 염색제로서의 유효성을 알아보기 위해 염색성을 조사하였고, 염색을 위한 전 처리로 탈색을 행하였으며, 탈색 조건에 의한 모발의 형태 및 물성 변화를 조사하였다. 염색 조건에 따른 염착량, 색상, 인장강도의 변화를 연구하였으며, 철매염에 의한 색상변화도 조사하였다. 그 결과 bleaching의 변화율을 통해 알 수 있는 것은 손상을 최소화한 천염염색을 위한 탈색조건은 H2O2의 농도 9%를 사용하여 시간을 단축하고 50℃에서 10분간 탈색한다. 염색모 인장강도 보유율은 침염으로 인해 손 상을 준다. 염색시간이 증가될수록 염착량이 증가하였다. 염료농도가 증가할수록 모 발 색상의 명도가 낮아지고 탁해졌다. 철(Fe)매염제의 처리를 한 경우가 훨씬 색상이 짙게 나왔다.