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RISS 인기검색어
- 검색키워드
- 저자 : Guy Campet (검색결과 5 건)
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Josik Portier,Guy Campet Korean Chemical Society 1997 대한화학회지 Vol.41 No.8
A simple relation exists between electronegativities of cations and their oxidation states and ionic radii. An empirical law is proposed: X = 0.274 z-0.15 z r - 0.01 r+1+${\alpha}$, z being oxidation number, r ionic radius in $\AA$ and ${\alpha}$ a term related to the atomic number. this relation permits to calculate an electronegativity scale covering a large set of electronic and crystallographic situations. An application to the calculation of acid strengths of cations is presented.
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Josik Portier,Guy Campet Korean Chemical Society 1997 대한화학회지 Vol.41 No.8
The acid strngth of cations, determined with ICP (Ionic Covalent Parameter): ICP=log(P)-1.38x+2.07 where P is the polarizing power and X its electronegativity expresses the competition between the covalent and ionic forces. This concept, together with electronegativity, is used to describe the properties of oxides with various electronic properties (insulators, metals, degenerate semiconductors, superconductors).
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Application of Hybrid Polymeric Complexes to Solid State and Materials Chemistry
Josik Portier,Guy Campet,Nadine Treuil,Armel Poquet,Kim, Young Il,Kwon, Soon Jae,Kwak, Seo Young,Choy, Jin Ho Korean Chemical Society 1998 대한화학회지 Vol.42 No.4
A bird's-eye view on preparation, structure and properties of polymeric complexes in the field of Inorganic-Organic-Hybrids is presented in the view point of solid state and materials chemistry. These materials are useful precursors for preparing nanoparticles and fine grain oxides. Some of them are electroactive and are used as protonic or lithium electrolytes, electrochromic materials or membranes for sensors and actuators. New results on bio-hybrids, a class of material not far from polymeric complexes, are also described.
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RF Sputtered Lithium Nickel Oxide Films and Their Electrochromism
Kim, Young-Il,Kim, Bae-Whan,Choy, Jin-Ho,Campet, Guy,Park, Nam-Gyu,Portier, Josik,Morel, Bertrand Korean Chemical Society 1997 대한화학회지 Vol.41 No.11
RF 스피터링법을 써서 $Li_{2x}Ni_{1-x}O$ 박막을 제조하였으며, 그 과정에서 기판의 온도$(50/230^{\circ}C)와$ 분위기 $(Ar/O_2)$를 변수로써 막의 미세구조를 조절하였다. 투과전자현미경을 이용한 막 구조 분석에 의해 낮은 기판 온도와 $O_2$ 조건에서 막의 조성입자가 작아짐을 관찰하였고, $50^{\circ}C/O_2$ 하에서 얻이진 $Li_{2x}Ni_{1-x}O$ 박막은 약 $80\AA$ 크기의 입자로 이루어져 있었다. 전기화학적 조건 하에서 $Li_{2x}Ni_{1-x}O$ 박막의 변색현상을 조사한 결과, 박막의 미세구조 발달에 의해 $Li^+$ 이온의 가역적 수용량이 증가하고, 결과적으로 전기변색 기능이 향상됨을 알 수 있엇다. 50 $^{\circ}C/O_2$ 하에서 얻어진 170 nm 두께의 $Li_{2x}Ni_{1-x}O$ 박막은 30 mC/$cm^2$의 $Li^+$ 이온 수용력과 함께 약 1.3의 흡광밀도(OD)를 나타내었다. Lithium nickel oxide ($Li_{2x}Ni_{1-x}O$) thin films have been prepared by the RF sputtering of lithiated nickel oxide target, where the film microstructure was controlled by the sputtering atmosphere $(Ar/O_2)$ and the substrate temperature ($T_s=50/230^{\circ}C$). From the transmission electron microscopic analysis, it is found that the most porous film with the grain size of $∼80\AA$ could be fabricated under the sputtering atmosphere of $P(O_2)=8{\times}10^2$ mbar with the $$T_s$=50^{\circ}C.$ In the optical and electrochemical studies, the$Li_{2x}Ni_{1-x}O$ films exhibit a significant electrochromic property in association with the lithium insertion/deinsertion process. The amount of charge insertion ($Q_i$) and the optical density (OD) variation depend on the crystallinity of the film as well as its thickness, and for the $Li_{2x}Ni_{1-x}O$ film (170 nm thickness) prepared under $O_2$ atmosphere and $T_s=50^{\circ}C$, the OD could be increased up to ∼1.3 by the charge insertion with $Q_i=30\;mC/cm^2.$
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Zyoud, Ahed,AlKerm, Rana S.,Alkerm, Rola S.,Abdelhadi, Doa׳,H.,Park, DaeHoon,Helal, Mohammed H.S.,Campet, Guy,Muthaffar, Reham W.,Kwon, Hansang,Hilal, Hikmat S. North-Holland 2016 Solar Energy Materials and Solar Cells Vol. No.
<P><B>Abstract</B></P> <P>High conversion efficiency (<I>η</I>) values have been obtained from modified CuS film electrodes electrochemically deposited onto Glass/FTO. The modification involved pre-annealing the film followed by coating with tetra(-4-pyridyl)porphyrinato manganese (MnTPyP<SUP>+</SUP>) ions embedded inside a polyethylene (PE) matrix. The Glass/FTO/CuS/MnTPyP/PE electrodes exhibited enhanced photo-electrochemical (PEC) characteristics under solar simulated illumination (5.6mW/cm<SUP>−2</SUP>) in aqueous media, compared to the as-prepared Glass/FTO/CuS films which showed no PEC activity. Up to 17.4% efficiency and 85% fill factor (FF) values were obtained from the modified film electrodes. Such characteristics have not been widely known for metal chalcogenide based film electrodes before. Different pre-annealing temperatures were attempted and the 250°C temperature, followed by quenching, showed favorable results. Different aqueous redox couples were studied and the environmentally safe FeCl<SUB>2</SUB>/FeCl<SUB>3</SUB> aqueous system showed highest PEC characteristics. Effect of pre-annealing on film electrode characteristics is discussed. The MnTPyP/PE matrix behaves as charge transfer catalyst for the holes across the CuS film/liquid junction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CuS film electrodes were coated with metalloporphyrinato manganese(III)/polyethylene matrices. </LI> <LI> High PEC characteristics have been exhibited by the modified electrodes. </LI> <LI> Modification enhanced both film electrode stability and efficiency together. </LI> <LI> The matrix behaved as charge transfer catalyst for holes at the solid/liquid interface. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Annealing CuS film electrodes at moderate temperatures (preferably at 250°C) affects CuS film morphology and spectral properties, and coating with metalloporphyrin/polymer matrices enhanced their PEC efficiency and stability.</P> <P>[DISPLAY OMISSION]</P>
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