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Property Control of Graphene by Employing “Semi‐Ionic” Liquid Fluorination
Lee, Jong Hak,Koon, Gavin Kok Wai,Shin, Dong Wook,Fedorov, V. E.,Choi, Jae‐,Young,Yoo, Ji‐,Beom,Ö,zyilmaz, Barbaros WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.26
<P><B>Abstract</B></P><P>Semi‐ionically fluorinated graphene (s‐FG) is synthesized with a one step liquid fluorination treatment. The s‐FG consists of two different types of bonds, namely a covalent C‐F bond and an ionic C‐F bond. Control is achieved over the properties of s‐FG by selectively eliminating ionic C‐F bonds from the as prepared s‐FG film which is highly insulating (current < 10<SUP>−13</SUP> A at 1 V). After selective elimination of ionic C‐F bonds by acetone treatment, s‐FG recovers the highly conductive property of graphene. A 10<SUP>9</SUP> times increase in current from 10<SUP>−13</SUP> to 10<SUP>−4</SUP>A at 1 V is achieved, which indicates that s‐FG recovers its conducting property. The properties of reduced s‐FG vary according to the number of layers and the single layer reduced s‐FG has mobility of more than 6000 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>. The mobility drastically decreases with increasing number of layers. The bi‐layered s‐FG has a mobility of 141cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> and multi‐layered s‐FG film showed highly p‐type doped electrical property without Dirac point. The reduction via acetone proceeds as 2C<SUB>2</SUB>F<SUB>(semi‐ionic)</SUB> + CH<SUB>3</SUB>C(O)CH<SUB>3(l)</SUB> → HF + 2C<SUB>(s)</SUB> + C<SUB>2</SUB>F<SUB>(covalent)</SUB> + CH<SUB>3</SUB>C(O)CH<SUB>2(l)</SUB>. The fluorination and reduction processes permit the safe and facile non‐destructive property control of the s‐FG film.</P>
Preparation and characterization of HTSC LuBa2Cu3O6+x single crystals
V.E.Fedorov,M.Yu.Kameneva,N.V.Podberezskaya,D.Yu.Naumov,N.F.Beizel,U-HyonPaeka,L.P.Kozeeva 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
For the first time large HTSC (high temperature superconductive) crystals of LuBa2Cu3O6+x (up to 5´5´0.2 mm3) were obtained from the Lu2O3-BaO-CuO system by a flux growth method. The crystals obtained were characterized by differential thermal analysis (DTA), chemical and X-ray diffraction analyses. The temperature of incongruent melting of the phase was defined more exactly (950±5oC). The composition of crystals corresponds to the formula LuBa2Cu3O6+x. The crystal structure of the tetragonal form was determined and x=0 was found for this case.
Makotchenko, V.G.,Grayfer, E.D.,Nazarov, A.S.,Kim, S.J.,Fedorov, V.E. Pergamon Press ; Elsevier Science Ltd 2011 Carbon Vol.49 No.10
A series of new highly exfoliated graphites were synthesized from fluorinated graphite intercalation compounds of compositions C<SUB>2</SUB>F.xR (R=ClF<SUB>3</SUB>, (CH<SUB>3</SUB>)<SUB>2</SUB>CO, CH<SUB>3</SUB>CN, C<SUB>6</SUB>H<SUB>6</SUB>, CCl<SUB>4</SUB>). The exfoliation degree of these materials reaches more than 2000 times, indicating a significantly higher exfoliated state than observed for the conventional expanded graphites derived from graphite bisulphate or nitrate. These exfoliated graphites have increased interlayer distances, specific surface areas as high as 170-370m<SUP>2</SUP>/g, low bulk densities of 0.4-0.7g/L, and good sorption capacities towards a range of organic and inorganic liquids. The influence of the nature of the intercalated molecules on the properties of the exfoliated graphite is discussed.
GYAGG/ 6 LiF composite scintillation screen for neutron detection
A. Fedorov,I. Komendo,A. Amelina,E. Gordienko,V. Gurinovich,V. Guzov,G. Dosovitskiy,V. Kozhemyakin,D. Kozlov,A. Lopatik,V. Mechinsky,V. Retivo,V. Smyslova,A. Zharova,M. Korzhik 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
Composite scintillation screens on a base of Gd1.2Y1.8Ga2.5Al2.5O12:Ce (GYAGG) scintillator have beenevaluated for neutron detection. Besides the powdered scintillator, the composite includes 6LiF particles;both are merged with a binder and deposited onto the light-reflecting aluminum substrate. Resultsobtained demonstrates that screens are suitable for use with a silicon photomultiplier readout to create aprospective solution for a compact and low-cost thermal neutron sensor. Composite GYAGG/6LiF scintillationscreen shows a pretty matched sensitivity and g-background rejection with a widely usedZnS/6LiF screens however, possesses forty times faster response.
Mironov, Yuri V.,Brylev, Konstantin A.,Kim, Sung-Jin,Kozlova, Svetlana G.,Kitamura, Noboru,Fedorov, Vladimir E. Elsevier 2011 Inorganica chimica acta Vol.370 No.1
<P><B>Graphical abstract</B></P><P>New hexarhenium cyanohydroxo cluster anion [Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]<SUP>4−</SUP> was synthesized and crystallized as a salt of the composition Cs<SUB>2.75</SUB>K<SUB>1.25</SUB>[Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]·H<SUB>2</SUB>O (<B>1</B>). Based on this anion two other compounds, namely [Cu(NH<SUB>3</SUB>)<SUB>5</SUB>]<SUB>2</SUB>[Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]·8H<SUB>2</SUB>O and [{Cu(CH<SUB>3</SUB>NH<SUB>2</SUB>)<SUB>4</SUB>}<SUB>2</SUB>Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>] were synthesized. All of these three compounds were characterized by a single-crystal X-ray diffraction method. The luminescence properties of <B>1</B> were studied in both aqueous solution and solid state. In addition, the electronic structure of [Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]<SUP>4−</SUP> was elucidated by DFT calculations.<ce:figure id='f0005'></ce:figure></P><P><B>Research highlights</B></P><P>► The partial substitution of terminal OH ligands in Re<SUB>6</SUB> cluster complex leads to <I>trans</I>-[Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]<SUP>4−</SUP>. ► The complex synthesized is a new multifunctional building block. ► The compound emits above 600nm in both solid phase and an aqueous solution.</P> <P><B>Abstract</B></P><P>A hexarhenium cyanohydroxo anionic cluster complex [Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]<SUP>4−</SUP> was synthesized for the first time starting from [Re<SUB>6</SUB>Se<SUB>8</SUB>(OH)<SUB>6</SUB>]<SUP>4−</SUP>, which was crystallized as a salt of the composition Cs<SUB>2.75</SUB>K<SUB>1.25</SUB>[Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]·H<SUB>2</SUB>O (<B>1</B>). The reaction of the complex with Cu<SUP>2+</SUP> in an aqueous ammonia or methylamine solutions afforded [Cu(NH<SUB>3</SUB>)<SUB>5</SUB>]<SUB>2</SUB>[Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]·8H<SUB>2</SUB>O (<B>2</B>) or [{Cu(CH<SUB>3</SUB>NH<SUB>2</SUB>)<SUB>4</SUB>}<SUB>2</SUB>Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>] (<B>3</B>), respectively. All of these three compounds were characterized by a single-crystal X-ray diffraction method. Compound <B>1</B> is crystallized in the tetragonal space group <I>I</I>4<I>/m</I> with eight formula units per cell (<I>a</I>=<I>b</I>=17.4823(14)Å, <I>c</I>=19.430(2)Å, <I>V</I>=5938.3(10)Å<SUP>3</SUP>); compound <B>2</B> is crystallized in the monoclinic space group <I>P</I>2<SUB>1</SUB><I>/n</I> with two formula units per cell (<I>a</I>=12.1845(13)Å, <I>b</I>=8.6554(9)Å, <I>c</I>=19.2568(19)Å, <I>β</I>=91.081(2)°, <I>V</I>=2030.5(4)Å<SUP>3</SUP>); compound <B>3</B> is crystallized in the orthorhombic space group <I>Cmcm</I> with four formula units per cell (<I>a</I>=19.816(4)Å, <I>b</I>=14.611(3)Å, <I>c</I>=13.751(3)Å, <I>V</I>=3981.2(13)Å<SUP>3</SUP>). The luminescence properties of <B>1</B> were studied in both aqueous solution and solid state. In addition, the electronic structure of [Re<SUB>6</SUB>Se<SUB>8</SUB>(CN)<SUB>4</SUB>(OH)<SUB>2</SUB>]<SUP>4−</SUP> was elucidated by DFT calculations.</P>
Yarovoi, Spartak S.,Mironov, Yuri V.,Naumov, Dmitry Y.,Gatilov, Yuri V.,Kozlova, Svetlana G.,Kim, Sung-Jin,Fedorov, Vladimir E. WILEY-VCH Verlag 2005 European journal of inorganic chemistry Vol.2005 No.19
<P>Two novel rhenium cluster compounds, K<SUB>4</SUB>[Re<SUB>6</SUB>S<SUB>8</SUB>(OH)<SUB>6</SUB>]·8H<SUB>2</SUB>O (1) and K<SUB>4</SUB>[Re<SUB>6</SUB>Se<SUB>8</SUB>(OH)<SUB>6</SUB>]·8H<SUB>2</SUB>O (2), containing octahedral cluster chalcogenide anionic complexes [Re<SUB>6</SUB>Q<SUB>8</SUB>(OH)<SUB>6</SUB>]<SUP>4–</SUP> with terminal hydroxo ligands have been synthesized by the reaction of Re<SUB>6</SUB>Q<SUB>8</SUB>Br<SUB>2</SUB> (Q = S, Se) with molten KOH. Two chalcohalide compounds, one known (Cs<SUB>4</SUB>[Re<SUB>6</SUB>S<SUB>8</SUB>Br<SUB>6</SUB>]·2H<SUB>2</SUB>O, 3) and another new (Cs<SUB>3</SUB>[Re<SUB>6</SUB>Se<SUB>8</SUB>Cl<SUB>6</SUB>]·2H<SUB>2</SUB>O, 4), were prepared by reactions of 1 and 2 with CsX and HX (X = Br, Cl) in an aqueous solution. Compounds 1, 2, and 4 have been characterized by the single-crystal X-ray diffraction method. Compounds 1 and 2 are crystallized in triclinic space group P<TEX>$\bar {1}$</TEX> with one formula unit in the cell of dimensions a = 8.4936(8) Å, b = 8.9101(11) Å, c = 10.5940(13) Å, α = 77.935(11)°, β = 75.933(9)°, γ = 71.244(10)°, V = 728.9(1) Å<SUP>3</SUP> (compound 1) and a = 8.613(1) Å, b = 8.996(1) Å, c = 10.057(1) Å, α = 78.587(2)°, β = 77.811(2)°, γ = 71.728(2)°, V = 715.9(2) Å<SUP>3</SUP> (compound 2). Compound 4 crystallizes in the monoclinic space group P2<SUB>1</SUB>/n with two formula units in the cell of dimensions a = 9.819(3) Å, b = 12.925(4) Å, c = 11.756(4) Å, β = 113.38(3)°, V = 1369.6(8) Å<SUP>3</SUP>. Compounds 1 and 2 display luminescent properties. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2005-2005-19-EJIC200500284-fig000.gif' alt='wiley_img/14341948-2005-2005-19-EJIC200500284-fig000'> </P>
Mironov, Yuri V.,Naumov, Nikolai G.,Kozlova, Svetlana G.,Kim, Sung-Jin,Fedorov, Vladimir E. WILEY-VCH Verlag 2005 Angewandte Chemie Vol.117 No.42
<B>Graphic Abstract</B> <P>Die Cyanidcluster [Re<SUB>12</SUB>CS<SUB>17</SUB>(CN)<SUB>6</SUB>]<SUP>n−</SUP> (n=8 oder 6) könnten als Bausteine für polymere Materialien dienen. Sie entstehen aus ReS<SUB>2</SUB> in geschmolzenem KCN bei 750 °C. Die Clustereinheit umfasst zwei {Re<SUB>6</SUB>}-Oktaeder, die durch drei μ<SUB>2</SUB>-S-Brücken und ein interstitielles μ<SUB>6</SUB>-C-Atom verbunden sind (siehe Bild). <img src='wiley_img/00448249-2005-117-42-ANGE200501911-content.gif' alt='wiley_img/00448249-2005-117-42-ANGE200501911-content'> </P>
Korzhik M.,Abashev R.,Fedorov A.,Dosovitskiy G.,Gordienko E.,Kamenskikh I.,Kazlou D.,Kuznecova D.,Mechinsky V.,Pustovarov V.,Retivov V.,Vasil'ev A. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.7
Ceramics of quaternary garnets (Gd,Y)3Al2Ga3O12 doped with Ce, Tb have been fabricated and evaluated as prospective materials for indirect energy converters of a-and b-voltaic. Samples were characterized at excitation with an X-ray source and an intense 150 keV electron beam and showed good temperature stability of their emission and tolerance to irradiation. The role of X-rays accompanied the a-particle emitting in the increase of the conversion efficiency is clarified. The garnet-type structure of the matrix in the developed materials allows the production of quality crystalline mass with a light yield exceeding that of the commonly used YAG: Ce scintillator by a factor of two times