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@PHDTHESIS{Ji:867906,
      author       = {Ji, Wenhai},
      title        = {{T}he guided self-assembly of magnetic nanoparticles into
                      two- and three-dimensional nanostructures using patterned
                      substrates},
      volume       = {214},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2019-06505},
      isbn         = {978-3-95806-462-1},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Schlüsseltechnologien / Key Technologies},
      pages        = {VI, 140 S.},
      year         = {2019},
      note         = {RWTH Aachen, Diss., 2019},
      abstract     = {The present thesis provides an original and extensive
                      contribution to the understanding of the self-assembly of
                      magnetic nanoparticles in different dimensions with the help
                      of patterned sapphire substrates and block copolymers. The
                      combination of real space and reciprocal space techniques
                      allows a better understanding of nanostructures with
                      different dimensions, which are formed on the patterned
                      substrates. The first topic covered in the thesis is
                      formation of 2D nanoparticle assemblies by annealing the
                      M-plane sapphire at various temperatures. The procedure is
                      adjusted to obtain patterned substrates that can accommodate
                      the nanoparticles of a given size. The highly-ordered 2D
                      magnetic nanoparticles arrays deposited on patterned
                      sapphire substrates were studied using scanning electron
                      microscopy and grazing incidence x-ray scattering (GISAXS)
                      methods. In addition, a detailed analysis of GISAXS data
                      using the Distorted Wave Born Approximation theory allowed
                      characterizing the samples quantitatively. The second topic
                      is to deal with the self-organization of 3D nanoparticles
                      assemblies over the macroscopic scale, with precise control
                      of the spatial organization of nanoparticles by employing
                      the block copolymers. It was achieved by controlling the
                      morphology of the block copolymer films with a solvent vapor
                      annealing, which proved to be a powerful method. It was
                      demonstrated that the solvent volume, annealing time and
                      drying process had an impact on the final morphology of the
                      nanocomposite film. The influence of those parameters was
                      thoroughly investigated and optimum values were derived. The
                      orientation parameter obtained from GISAXS measurements
                      allows identifying the different stages of the alignment of
                      the block copolymer matrix. Using developed approach, 3D
                      nanoparticles with a long-range order in nanocomposite film
                      can be readily obtained on patterned substrates, which were
                      confirmed by both atomic force microcopy and GISAXS methods.
                      The magnetic interactions between magnetic nanoparticles in
                      nanocomposite film, containing only 8 wt $\%$ of
                      nanoparticles were studied with polarized neutron scattering
                      experiments. The qualitative analysis of the grazing
                      incidence neutron scattering and polarized neutron
                      reflectometry data, combined with GISAXS data analysis,
                      unambiguously demonstrated that a weak magnetic scattering
                      from array of magnetic nanoparticles can be detected. The
                      methodology developed in this work exemplifies a key role of
                      polarized neutron scattering techniques in characterization
                      of magnetic inter-particle interactions embedded in complex
                      nanocomposite materials. In conclusion, this work shows how
                      2D and 3D nanoparticles assemblies can be prepared by using
                      patterned substrates and how preparation parameters affect
                      the resulting nanostructures. The vital role of various
                      scattering methods in qualitative characterization of
                      structural and magnetic properties of nanostructures was
                      emphasized.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)MARIA-20140101 / EXP:(DE-MLZ)KWS1-20140101 /
                      EXP:(DE-MLZ)KWS3-20140101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2020072205},
      url          = {https://juser.fz-juelich.de/record/867906},
}