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Dina Fattakhovarohlfing - One of the best experts on this subject based on the ideXlab platform.

  • making ultrafast high capacity anodes for lithium ion batteries via antimony doping of nanosized Tin Oxide graphene composites
    Advanced Functional Materials, 2018
    Co-Authors: Kristina Peters, Patrick Zeller, Dina Fattakhovarohlfing, Florian Zoller, Peter M Zehetmaier, Markus Doblinger, Thomas Bein, Zdeneˇk Sofer
    Abstract:

    Tin Oxide-based materials attract increasing attention as anodes in lithium-ion batteries due to their high theoretical capacity, low cost, and high abundance. Composites of such materials with a carbonaceous matrix such as graphene are particularly promising, as they can overcome the limitations of the individual materials. The fabrication of Antimony-Doped Tin Oxide (ATO)/graphene hybrid nanocomposites is described with high reversible capacity and superior rate performance using a microwave assisted in situ synthesis in tert-butyl alcohol. This reaction enables the growth of ultrasmall ATO nanoparticles with sizes below 3 nm on the surface of graphene, providing a composite anode material with a high electric conductivity and high structural stability. Antimony doping results in greatly increased lithium insertion rates of this conversion-type anode and an improved cycling stability, presumably due to the increased electrical conductivity. The uniform composites feature gravimetric capacity of 1226 mAh g(-1) at the charging rate 1C and still a high capacity of 577 mAh g(-1) at very high charging rates of up to 60C, as compared to 93 mAh g(-1) at 60C for the undoped composite synthesized in a similar way. At the same time, the Antimony-Doped anodes demonstrate excellent stability with a capacity retention of 77% after 1000 cycles.

  • nanostructured antimony doped Tin Oxide layers with tunable pore architectures as versatile transparent current collectors for biophotovoltaics
    Advanced Functional Materials, 2016
    Co-Authors: Kristina Peters, Hasala N Lokupitiya, David Sarauli, Mathias Labs, Mathias Pribil, Jiři Rathouský, Alexander Kuhn, Dario Leister, Morgan Stefik, Dina Fattakhovarohlfing
    Abstract:

    Nanostructured transparent conducTing Oxide (TCO) layers gain increasing importance as high surface area electrodes enabling incorporation of functional redox species with high loading. The fabrication of porous TCO films, namely, Antimony-Doped Tin Oxide (ATO), is reported using the self-assembly of preformed ATO nanocrystals with poly(ethylene Oxide-b-hexyl acrylate) (PEO-b-PHA) block copolymer. The high molar mass of the polymer and tunable solution processing conditions enable the fabrication of TCO electrodes with pore sizes ranging from mesopores to macropores. Particularly notable is access to uniform macroporous films with a nominal pore size of around 80 nm, which is difficult to obtain by other techniques. The combination of tunable porosity with a large conducTing interface makes the obtained layers versatile current collectors with adjustable performance. While all the obtained electrodes incorporate a large amount of small redox molecules such as molybdenum polyoxometalate, only the electrodes with sufficiently large macropores are able to accommodate high amounts of bulky photoactive photosystem I (PSI) protein complexes. The 11-fold enhancement of the current response of PSI modified macroporous ATO electrodes compared to PSI on planar indium Tin Oxide (ITO), makes this type of electrodes promising candidates for the development of biohybrid devices.

  • water dispersible small monodisperse electrically conducTing antimony doped Tin Oxide nanoparticles
    Chemistry of Materials, 2015
    Co-Authors: Kristina Peters, Patrick Zeller, Goran Stefanic, V Skoromets, P Kužel, Dina Fattakhovarohlfing
    Abstract:

    We describe the fabrication of crystalline electrically conducTing Antimony-Doped Tin Oxide (ATO) nanoparticles highly dispersible in polar solvents such as water and ethanol without any stabilizing agents. Nonagglomerated monodisperse ATO nanoparticles with different doping levels are obtained by a facile solvothermal reaction in tert-butanol, leading to the formation of monodisperse nanocrystals with a size of about 3 nm directly after synthesis. Electrical conductivity of ATO nanoparticles strongly increases due to the substitutional doping with antimony, reaching 6.8 × 10–2 S cm–1 for the as-synthesized nanoparticles prepared with 3–5 mol % Sb. This increase stems from transition from hopping in the undoped samples to band-like conduction in the doped samples as revealed by terahertz (THz) spectroscopy measurements describing transport on nanometer distances. The dc conductivity of the doped nanoparticles increases by about 3 orders of magnitude up to 62 S cm–1 after annealing in air at 500 °C. The el...

  • highly conducTing nanosized monodispersed antimony doped Tin Oxide particles synthesized via nonaqueous sol gel procedure
    Chemistry of Materials, 2009
    Co-Authors: Vesna Muller, Goran Stefanic, Matthias Rasp, Jianhua Ba, S Gunther, Jiri Rathousky, Markus Niederberger, Dina Fattakhovarohlfing
    Abstract:

    ConducTing Antimony-Doped Tin Oxide (ATO) nanoparticles are prepared by a nonaqueous solution route, using benzyl alcohol as both the oxygen source and the solvent, and Tin tetrachloride and various Sb(III) and Sb(V) compounds as Tin and antimony sources, respectively. This reaction produces nonagglomerated crystalline particles 3−4 nm in size, which can be easily redispersed in high concentrations in a variety of solvents to form stable transparent colloidal solutions without any stabilizing agents. The synthesis temperature is the most important processing parameter largely governing the reaction course and the particle properties, while the nature of the antimony source has only a marginal influence. The cassiterite SnO2 lattice can accommodate up to 30 mol % antimony without significant changes in the structure. The incorporation of an increasing percentage of antimony causes a conTinuous decrease in particle size and a slight asymmetric lattice distortion. The introduction of an antimony dopant drama...

Jianrong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • synthesis of antimony doped Tin Oxide ato nanoparticles by the nitrate citrate combustion method
    Materials Research Bulletin, 2004
    Co-Authors: Jianrong Zhang
    Abstract:

    Antimony-Doped Tin Oxide (ATO) nanoparticles having rutile structure have been synthesized by the combustion method using citric acid (CA) as fuel and nitrate as an oxidant, the metal sources were granulated Tin and Sb{sub 2}O{sub 3}. The influence of citric acid (fuel) to metal ratio on the average crystallite size, specific surface area and morphology of the nanoparticles has been investigated. X-ray diffraction showed the Tin ions were reduced to elemental Tin during combustion reaction. The average ATO crystallite size increased with the increase of citric acid (fuel). Powder morphology and the comparison of crystallite size and grain size shows that the degree of agglomeration of the powder decreased with an increase of the ratio. The highest specific surface area was 37.5 m{sup 2}/g when the citric acid to Tin ratio was about 6.

  • synthesis and characterization of antimony doped Tin Oxide ato nanoparticles by a new hydrothermal method
    Materials Chemistry and Physics, 2004
    Co-Authors: Jianrong Zhang
    Abstract:

    Abstract Antimony-Doped Tin Oxide (ATO) nanoparticles have been synthesized by mild hydrothermal method free from the widely used metal chlorides. The obtained particles were characterized by means of XRD, BET, Hall effect measurements, XPS and TEM. X-ray diffraction shows that all Sb ions came into the SnO2 lattice to substitute Sn ions, though the hydrothermal temperature was as low as 120 °C. Increasing the heat treatment temperature accelerates the growth of the nanoparticles, changes the electrical conductivity, the distribution of the Sb ions and relative amount of the two oxidation states Sb5+and Sb3+. TEM shows the ATO nanoparticles were monodispersed in the range of 3–5 nm.

  • synthesis and characterization of antimony doped Tin Oxide ato nanoparticles
    Inorganic Chemistry Communications, 2004
    Co-Authors: Jianrong Zhang
    Abstract:

    Abstract Antimony-Doped Tin Oxide (ATO) nanoparticles were successfully synthesized by the coprecipitation method from the starTing materials granulated Tin and Sb 2 O 3 for the first time.

Liangyan Chen - One of the best experts on this subject based on the ideXlab platform.

  • surface morphologies and properties of pure and antimony doped Tin Oxide films derived by sol gel dip coaTing processing
    Materials Chemistry and Physics, 2006
    Co-Authors: Daoli Zhang, Zhibing Deng, Jianbing Zhang, Liangyan Chen
    Abstract:

    Abstract A simple laboratory technique for the rouTine preparation of Antimony-Doped Tin Oxide (ATO) on float glass substrates (25 mm × 76 mm × 1 mm) was described. As-prepared thin films were dried at temperature of 100 ± 5 °C and annealed at temperatures of 400–550 °C. Microstructural and morphological analyses of as-prepared films were performed at different conditions. The evolution of grain size and the morphologies of ATO films were analyzed by means of atom force microscopy (AFM) and digital microscope. The studies suggested that higher Sb-doped level and higher annealing temperature led to a decrease in the surface roughness of the deposited films. The XRD patterns revealed that as-prepared ATO films were in the crystallization of a tetragonal rutile structure of SnO2 with highly (1 1 0) preferred orientation. Their optical properties were analyzed by U-3310 spectrophotometer. The transmission of the ATO thin films was obtained as high as 80–90% in visible region, but decreased substantially in IR region. The sheet resistance of the investigated thin films was determined by four-probe method, showing that it was about 85–100 Ω □−1which decreased with the increase of Antimony-Doped concentration.

  • microstructure and electrical properties of antimony doped Tin Oxide thin film deposited by sol gel process
    Materials Chemistry and Physics, 2006
    Co-Authors: Daoli Zhang, Zhibing Deng, Jianbing Zhang, Liangyan Chen
    Abstract:

    Abstract Antimony-Doped Tin Oxide thin films have a range of technical applications as conductive coaTings, and sol–gel processing seems to offer some advantages over other coaTing techniques. In this study, undoped and Antimony-Doped Tin Oxide (ATO) thin films were prepared by sol–gel process in the solution of metal salts of Tin (II) chloride dehydrate and antimony tri-chloride. It has been found that the heat-treatment temperature and doping level had strong influences on the microstructure and composition of Sb:SnO 2 films. The microstructure of the thin films was analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The SnO 2 crystals existed mainly as tetragonal rutile structure in the present work. The optimum heat-treatment temperature was about 450–500 °C, and the film was composed with nano-crystals and nano-pores. Compared with undoped Tin Oxide, doped antimony Tin Oxide films coated glass substrate were homogenenous in composition and morphology after being sintered at different temperatures. Electrical behavior of the doped films was discussed in terms of sheet resistance measured by four point probe. From the experimental data, the sheet resistance of the films could be as low as 100 Ω/□.

Guillaume Ozouf - One of the best experts on this subject based on the ideXlab platform.

Olga Kasian - One of the best experts on this subject based on the ideXlab platform.