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RISS 인기검색어
- 검색키워드
- 저자 : ROGER G. HARRISON (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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SYNTHESIS, CHARACTERIZATION, AND OPTICAL PROPERTIES OF Y-DOPED ZnO NANOPARTICLES
TALAAT M. HAMMAD,JAMIL K. SALEM,ROGER G. HARRISON 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.4
Zinc oxide (ZnO) and yttrium-doped ZnO nanoparticles with particle size in the nanometer range have been successfully synthesized by the alkali precipitation method. The nanoparticle size and morphology have been investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM). The average particle size of Y-doped ZnO nanoparticles is about 17–29 nm. The absorption and photoluminescence (PL) spectra of the undoped and doped ZnO nanoparticles were also investigated. The optical band gap of ZnO nanoparticles can be tuned from 3.27 to 3.40 eV with increasing yittrium doping levels from 0 to 5%. The nanoparticles gave two emission peaks, one at around 376 nm and the other at 500 nm.
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Song, Eun Joo,Kang, Juhye,You, Ga Rim,Park, Gyeong Jin,Kim, Youngmee,Kim, Sung-Jin,Kim, Cheal,Harrison, Roger G. The Royal Society of Chemistry 2013 Dalton transactions Vol.42 No.43
<P>A new metal ion sensor that contains quinoline and pyridylaminophenol has been synthesized. In acetonitrile and in the presence of Zn<SUP>2+</SUP>, the sensor fluoresces. In contrast, in aqueous solutions the sensor fluoresces in the presence of Cd<SUP>2+</SUP>. The fluorescence of the molecule is selective for Zn<SUP>2+</SUP> or Cd<SUP>2+</SUP> and shows no fluorescence with other metal ions. The crystal structure of the Cd<SUP>2+</SUP> complex shows coordination through the amide and phenol oxygens, as well as the amine nitrogen of the sensor. The sensor also acts as a colorimetric sensor for Co<SUP>2+</SUP> by changing color from colorless to yellow. The color change is selective for Co<SUP>2+</SUP> and is not observed with other metal ions. The unique combination of pyridine and phenol groups with quinoline results in the properties of this sensor.</P> <P>Graphic Abstract</P><P>A new metal ion sensor based on quinoline fluoresces in organic solvents with Zn<SUP>2+</SUP>, fluoresces in aqueous solutions with Cd<SUP>2+</SUP> and changes color in organic solvents with Co<SUP>2+</SUP>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3dt51635k'> </P>
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Zinc sensors with lower binding affinities for cellular imaging
Kim, Jin Hoon,Hwang, In Hong,Jang, Seung Pyo,Kang, Juhye,Kim, Sumi,Noh, Insup,Kim, Youngmee,Kim, Cheal,Harrison, Roger G. The Royal Society of Chemistry 2013 Dalton transactions Vol.42 No.15
<P>Zinc sensors based on 2,3-dipicolylamine (DPA) and quinoline have been synthesized. They fluoresced in the presence of Zn<SUP>2+</SUP> and remained fluorescent when other metal ions were present. Fluorescence enhancement of the sensors was not seen for most other metal ions. <I>In vitro</I> studies with fibroblasts showed fluorescence when sensor and Zn<SUP>2+</SUP> were present. As seen by single crystal X-ray analysis, four nitrogens from the sensor bind to Zn<SUP>2+</SUP>. These new sensors have lower binding constants than the pentadentate sensors based on 2,2-DPA.</P> <P>Graphic Abstract</P><P>Molecules based on quiniline and bispicolylamine selectively bind Zn<SUP>2+</SUP> ions, fluoresce and cause fluorescence in cells exposed to Zn<SUP>2+</SUP>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3dt33024a'> </P>
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A zinc fluorescent sensor used to detect mercury (II) and hydrosulfide
Jung, Jae Min,Lee, Jae Jun,Nam, Eunju,Lim, Mi Hee,Kim, Cheal,Harrison, Roger G. Elsevier 2017 Spectrochimica acta. Part A, Molecular and biomole Vol.178 No.-
<P><B>Abstract</B></P> <P>A zinc sensor based on quinoline and morpholine has been synthesized. The sensor selectively fluoresces in the presence of Zn<SUP>2+</SUP>, while not for other metal ions. Absorbance changes in the 350nm region are observed when Zn<SUP>2+</SUP> binds, which binds in a 1:1 ratio. The sensor fluoresces due to Zn<SUP>2+</SUP> above pH values of 6.0 and in the biological important region. The Zn<SUP>2+</SUP>-sensor complex has the unique ability to detect both Hg<SUP>2+</SUP> and HS<SUP>−</SUP>. The fluorescence of the Zn<SUP>2+</SUP>-sensor complex is quenched when it is exposed to aqueous solutions of Hg<SUP>2+</SUP> with sub-micromolar detection levels for Hg<SUP>2+</SUP>. The fluorescence of the Zn<SUP>2+</SUP>-sensor complex is also quenched by aqueous solutions of hydrosulfide. The sensor was used to detect Zn<SUP>2+</SUP> and Hg<SUP>2+</SUP> in living cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Zinc selective fluorescent sensor </LI> <LI> Zn sensor used to detect Hg<SUP>2+</SUP> </LI> <LI> Zn sensor used to detect HS<SUP>−</SUP> </LI> <LI> Hg<SUP>2+</SUP> and HS<SUP>−</SUP> detection on test strips </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>The fluorescence of the zinc sensor is sensitive to mercury and sulfide ions.</P> <P>[DISPLAY OMISSION]</P>
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