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Kim, Yeoju,Kim, Joohoon American Chemical Society 2014 ANALYTICAL CHEMISTRY - Vol.86 No.3
<P>Here, we report highly enhanced stable electrogenerated chemiluminescence (ECL) of Ru(bpy)<SUB>3</SUB><SUP>2+</SUP> (bpy = 2,2′-bipyridyl) with tripropylamine (TPrA) coreactant on indium tin oxide (ITO) electrodes modified with amine-terminated dendrimers encapsulating catalytic nanoparticles while maintaining optical transparency of ITO and feasibility of the modified ITOs to sensitive ECL-based assays. As model systems, we prepared Pt and Au dendrimer-encapsulated nanoparticles (DENs) using amine-terminated sixth-generation poly(amido amine) dendrimers and subsequently immobilized the DENs onto ITO surfaces via electrooxidative grafting of the terminal amines of dendrimers to the surfaces. The resulting DEN-modified ITOs preserved good optical transparency of ITO and exhibited highly catalyzed electrochemical oxidation of Ru(bpy)<SUB>3</SUB><SUP>2+</SUP>/TPrA, leading to significantly increased ECL emission. Especially, the Pt DEN-modified ITO electrode provides negligible transmittance drop, i.e., only ∼1.99% over the entire visible region, and exhibited not only much enhanced (i.e., ∼213-fold increase compared to ECL obtained from bare ITO) but also stable ECL emission under consecutive potential scans from 0.00 to 1.10 V for 10 cycles, which allowed ∼329 times more sensitive ECL-based analysis of nicotine using the Pt DEN-modified ITO compared with the use of bare ITO.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2014/ancham.2014.86.issue-3/ac403415m/production/images/medium/ac-2013-03415m_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac403415m'>ACS Electronic Supporting Info</A></P>
Near-infrared electrochemiluminescence from orange fluorescent Au nanoclusters in water
Kim, Jun Myung,Jeong, Seonghyun,Song, Jae Kyu,Kim, Joohoon The Royal Society of Chemistry 2018 Chemical communications Vol.54 No.23
<P>We report the unusual generation of near-infrared (near-IR) electrochemiluminescence (ECL) from water-soluble Au nanoclusters (NCs), of which the photoluminescence is primarily within the visible wavelength region. The near-IR ECL is ascribed to the Au(0)-glutathione motif in the Au NCs stabilized by glutathione in water.</P>
Blue Luminescence of Dendrimer‐Encapsulated Gold Nanoclusters
Kim, Jun Myung,Sohn, So Hyeong,Han, Noh Soo,Park, Seung Min,Kim, Joohoon,Song, Jae Kyu WILEY‐VCH Verlag 2014 CHEMPHYSCHEM -WEINHEIM- Vol.15 No.14
<P><B>Abstract</B></P><P>Direct evidence for the blue luminescence of gold nanoclusters encapsulated inside hydroxyl‐terminated polyamidoamine (PAMAM) dendrimers was provided by spectroscopic studies as well as by theoretical calculations. Steady‐state and time‐resolved spectroscopic studies showed that the luminescence of the gold nanoclusters consisted largely of two electronic transitions. Theoretical calculations indicate that the two transitions are attributed to the different sizes of the gold nanoclusters (Au<SUB>8</SUB> and Au<SUB>13</SUB>). The luminescence of the gold nanoclusters was clearly distinguished from that of the dendrimers.</P>
Kim Jiwoo,Kim Joohoon 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.11
We reported the electrochemically induced deposition of hydroxyl-terminated poly(amidoamine) dendrimers encapsulating Pt nanoparticles on the surface of indium tin oxide (ITO). The electrochemical deposition led to significantly high surface coverage of Pt nanoparticles encapsulated inside the dendrimers on ITO surfaces, which allowed enhanced (i.e., ca. 212-fold) electrochemiluminescence of Ru(bpy)3 2+/tripropylamine on the modified ITOs compared to unmodified ITO.
Kim Jiwoong,Kim Joohoon 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.1
We synthesized Pt nanoparticles using amine-terminated poly(amidoamine) dendrimers to hybridize the nanoparticles encapsulated inside dendrimers with graphene oxide (GO) sheets. The resulting Pt–GO hybrid composites revealed improved electrocatalytic activity in oxygen reduction reaction compared with GO sheets.
Kim, Jun Myung,Kim, Jungahn,Kim, Joohoon The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.74
<P>We report a method for universal assembly of multiple nanoparticles with different sizes and compositions on a single chemically converted graphene sheet with good control over particle sizes in the range of 1 to 2 nm through the covalent immobilization of dendrimer-encapsulated nanoparticles.</P> <P>Graphic Abstract</P><P>Multiple jewels on a graphene sheet: universal approach for assembly of multiple nanoparticles with different sizes and compositions on a single graphene sheet with good control over particle sizes in the range of 1 to 2 nm. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc31780j'> </P>
평생학습계좌제와 검정고시 연계를 위한 학습과정 평가인정 절차 및 평가지표 개발연구
김만희(Kim ManHee),전주성(Jun JuSung),김주훈(Kim Joohoon),안성훈(Ahn SeongHun),서순영(Seo SoonYoung) 중앙대학교 한국인적자원개발전략연구소 2012 역량개발학습연구 Vol.7 No.2
이 연구에서는 관계 법령에 따라 평생학습계좌제와 고입/고졸 검정고시를 연계시키기 위한 실천적 전략으로 검정고시 과목의 고시 면제를 위한 평생학습계좌제 학습과정 평가인정 절차 및 평가지표를 개발하고자 하였다. 이 연구는 5명의 연구진과 핵심 이해당사자 등이 참여한 액션 리서치 방법에 의해 수행되었다. 연구결과로 평생학습계좌제와 검정고시 연계를 위한 평가인정 절차 및 평가지표가 제시되었다. 더불어, 이 연구가 수행되게 된 근본 취지를 더 잘 살리기 위하여 (1) 검정고시 과목별로 연계가 가능한 평생교육프로그램의 DB 확보, (2) 국어, 영어, 수학을 포함하여 모든 과목을 평생학습계좌제 이수를 통해 면제 받을 수 있도록 검정고시 규칙 개정, (3) 교육기회 소외자 중심의 탄력적인 제도 운영 등 몇 가지 중요한 개선 노력들도 제안되었다. The purpose of this study was to develop an accreditation procedure for connection between the lifelong learning account system and the qualification examination for middle/high school degree. To achieve the research purpose, the researchers used action research as the research methodology. Five researchers and some key stakeholders were participated in the study. They suggested an accreditation procedure including some evaluation indexes for connection between those two systems, reflecting the intent of the Lifelong Education Act 2011 and the Regulation 2010 of the Qualification Examination for Middle/High School Degree.