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Electrochemically programmed chemodosimeter on ultrathin platinum films
Kim, Yang-Rae,Kim, Hyun Jung,Lee, Min Hee,Kang, Yeon-Joo,Yang, Yongtak,Kim, Hasuck,Kim, Jong Seung Royal Society of Chemistry 2010 Chemical communications Vol.46 No.44
<P>We demonstrate electrochemically controlled release of chemodosimeters attached to ultrathin patterned platinum electrodes. Fluorescence and electrochemical methods have been employed for the detection of chemodosimeter modification/desorption and Cu<SUP>2+</SUP> binding/removal.</P> <P>Graphic Abstract</P><P>We demonstrate electrochemically controlled release of chemodosimeter attached to patterned platinum electrode. Furthermore, the electrode is recycled in basic solution so that it can be reused in Cu(<SMALL>II</SMALL>) sensing system. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc02528c'> </P>
Kim, Yang-Rae,Kim, Hyun Jung,Kim, Jong Seung,Kim, Hasuck WILEY-VCH Verlag 2008 ADVANCED MATERIALS Vol.20 No.23
<B>Graphic Abstract</B> <P>A thiol-functionalized rhodamine-based chemodosimeter on platinum films (PFIR) is successfully used for the first time as a molecular switch for the fluorescent sensing of Cu<SUP>2+</SUP>. In addition, the colorimetric response (colorless to pink) of the PFIR could be detected by the naked eye as platinum films display optical transparency (transmittance of ∼0.70) in the visible spectral region. <img src='wiley_img/09359648-2008-20-23-ADMA200801001-content.gif' alt='wiley_img/09359648-2008-20-23-ADMA200801001-content'> </P>
Ionic Recognition with Quinone-Derivatized Calixarenes in Solution and at Self-Assembled Monlayers
Kim Hasuck,Kang Sun Kil,Chung Taek Dong The Korean Electrochemical Society 2000 한국전기화학회지 Vol.3 No.2
카르복시산과 이황하물 다리를 가지며 산화환원 활성이 있는 칼릭스[4]아렌을 합성하였고 그것이 은과 금 표면 위에 자발적으로 흡착하는 것을 관찰하였다. 칼릭스[4]아렌은 특이한 구조 때문에 수용액에서 알칼리 토금속이온에 선택적인 친화력을 보인다 한편 둥그런 이온 수용체를 전극 위에 고정시켰을 때 금속 이온을 포획하는 것을 전압전류법 및 분광학적인 연구를 통해 확인하였다. 아울러 EDTA와 같은 강한 킬레이트제를 이용하여 이온을 가역적으로 제거할 수 있음을 보였다. Redox-active calix[4]arenes with carboxylic acid and disulfide groups were prepared and spontaneous deposition on silver and gold surfaces was observed. Owing to their unusual structure, the calix[4]arenes exhibit selective affinity fur alkaline earth metal ions in aqueous media. When annular ionophores are immobilized on the surface, voltammetric and spectroscopic studies show the entrapment of metal ions. Furthermore, it was possible to reversibly capture and remove the ions using strong chelating agents such as ethylenediaminetetraacetic acid (EDTA).
Catalytic Reactions in Direct Ethanol Fuel Cells
Kim, In,Han, Oc Hee,Chae, Seen Ae,Paik, Younkee,Kwon, Sung‐,Hyea,Lee, Kug‐,Seung,Sung, Yung‐,Eun,Kim, Hasuck WILEY‐VCH Verlag 2011 Angewandte Chemie Vol.123 No.10
<P><B>Der Anodenkatalysator</B> (Pt/C, PtRu/C, Pt<SUB>3</SUB>Sn/C) und die Betriebsspannung beeinflussen laut <SUP>13</SUP>C‐NMR‐Spektroskopie in flüssiger Phase die Produktverteilung im Anodenabgas direkter Ethanolbrennstoffzellen (siehe typisches Spektrum). Mit Ru oder Sn ist die Stromdichte höher, vor allem aufgrund einer erhöhten Essigsäureproduktion. Die Potentialabhängigkeit der Produktverteilung lässt Rückschlüsse auf Reaktionspfade der Elektrooxidation zu.</P>
Kim, Yang‐,Rae,Seo, Hyo‐,Ju,Oh, Jeong‐,Wook,Lim, Hyunchang,Kim, Tae Hyun,Kim, Hasuck WILEY‐VCH Verlag 2013 Electroanalysis Vol.25 No.4
<P><B>Abstract</B></P><P>An electrogenerated chemiluminescence (ECL)‐based immunosensor for the detection of immunoglobulin G (IgG) has been fabricated using Ru(bpy)<SUB>3</SUB><SUP>2+</SUP>‐doped silica nanoparticles and calix[4]crown‐5 self‐assembled monolayers (SAMs). Ru(bpy)<SUB>3</SUB><SUP>2+</SUP>‐doped silica nanoparticles are prepared by the water‐in‐oil (W/O) microemulsion method. ProLinker B, a commercially available thiolated calix[4]crown‐5 derivative, is utilized for the immobilization of anti‐immunoglobulin G (Anti‐IgG) on a gold electrode. The concentration of IgG is measured using a sandwich‐type ECL immunosensor based on the proposed immunosensor. The ECL intensity is linearly proportional to the IgG concentration over the concentration range 5–30 µg mL<SUP>−1</SUP>. The detection limit of IgG is 1.5 µg mL<SUP>−1</SUP>.</P>
Kim, Yang-Rae,Mahajan, Rakesh Kumar,Kim, Jong Seung,Kim, Hasuck American Chemical Society 2010 ACS APPLIED MATERIALS & INTERFACES Vol.2 No.1
<P>A strategy for the rational design of a novel colorimetric sensor based on dithioerythritol-modified gold nanoparticles for the selective recognition of Hg<SUP>2+</SUP> in aqueous media is presented. This approach relies on the combination of gold nanoparticles with Hg<SUP>2+</SUP> through sulfur−Hg<SUP>2+</SUP>−sulfur interaction. The gold nanoparticles showed high selectivity toward Hg<SUP>2+</SUP> with binding-induced red shift in the absorption spectra, with no response to major interfering cations such as Pb<SUP>2+</SUP>, Cd<SUP>2+</SUP>, and Cu<SUP>2+</SUP> in the presence of ethylenediamine tetraacetic acid. The system responds to Hg<SUP>2+</SUP> with a detection limit of 100 nM and might open a new avenue for the development of Hg<SUP>2+</SUP> sensing probes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2010/aamick.2010.2.issue-1/am9006963/production/images/medium/am-2009-006963_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am9006963'>ACS Electronic Supporting Info</A></P>
Kim, Tae Hyun,Kim, Jong Seung,Kim, Hasuck Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.11
The spectrophotometric and electrochemical properties of tetraazo(p-carboxy)phenylcalix[4]arene (p-CAC) in the presence of various metal ions were investigated by UV/Vis spectroscopy and voltammetry in $CH_3CN$. p-CAC showed selective color changes to $Cu^{2+}$ over other metal ions from light orange to colorless, in accordance with hypsochromic shift in UV/Vis spectra. Voltammetric measurements also showed high selectivity for $Cu^{2+}$.
Han, Donghoon,Kim, Yang-Rae,Oh, Jeong-Wook,Kim, Tae Hyun,Mahajan, Rakesh Kumar,Kim, Jong Seung,Kim, Hasuck Royal Society of Chemistry 2009 The Analyst Vol.134 No.9
<P>We have developed a selective, sensitive, and re-usable electrochemical sensor for Hg<SUP>2+</SUP> ion detection. This sensor is based on the Hg<SUP>2+</SUP>-induced conformational change of a single-stranded DNA (ssDNA) which involves an electroactive, ferrocene-labeled DNA hairpin structure and provides strategically the selective binding of a thymine–thymine mismatch for the Hg<SUP>2+</SUP> ion. The ferrocene-labeled DNA is self-assembled through S–Au bonding on a polycrystalline gold electrode surface and the surface blocked with 3-mercapto-1-propanol to form a mixed monolayer. The modified electrode showed a voltammetric signal due to a one-step redox reaction of the surface-confined ferrocenyl moiety. The ‘signal-on’ upon mercury binding could be attributed to a change in the conformation of ferrocene-labeled DNA from an open structure to a restricted hairpin structure. The differential pulse voltammetry (DPV) of the modified electrode showed a linear response of the ferrocene oxidation signal with increase of Hg<SUP>2+</SUP> concentration in the range between 0.1 and 2 µM with a detection limit of 0.1 µM. The molecular beacon mercury(<SMALL>II</SMALL>) ion sensor was amenable to regeneration by simply unfolding the ferrocene-labeled DNA in 10 µM cysteine, and could be regenerated with no loss in signal gain upon subsequent mercury(<SMALL>II</SMALL>) ion binding.</P> <P>Graphic Abstract</P><P>This sensor is based on the Hg<SUP>2+</SUP>-induced conformational change of a single-stranded DNA which involves an electroactive, ferrocene-labeled DNA hairpin structure and provides strategically the selective binding of a thymine–thymine mismatch for Hg<SUP>2+</SUP> ion. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b908457f'> </P>
Kang, Yeon-Joo,Oh, Jeong-Wook,Kim, Yang-Rae,Kim, Jong Seung,Kim, Hasuck Royal Society of Chemistry 2010 Chemical communications Vol.46 No.31
<P>The enantioselective recognition of 3,4-dihydroxyphenylalanine using penicillamine-modified gold nanoparticles has been investigated. Smaller gold nanoparticles with one enantiomeric ligand facilitate the redox reaction of only one enantiomer of 3,4-dihydroxyphenylalanine, with cross inversion for the gold nanoparticles with the other enantiomeric ligand.</P> <P>Graphic Abstract</P><P>The enantioselective recognition of 3,4-dihydroxyphenylalanine using penicillamine-modified gold nanoparticles has been investigated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc01071e'> </P>