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@ARTICLE{Dzhagan:890122,
      author       = {Dzhagan, Volodymyr and Selyshchev, Oleksandr and Raievska,
                      Oleksandra and Stroyuk, Oleksandr and Hertling, Lukas and
                      Mazur, Nazar and Valakh, Mykhailo Ya. and Zahn, Dietrich R.
                      T.},
      title        = {{P}honon {S}pectra of {S}trongly {L}uminescent
                      {N}onstoichiometric {A}g–{I}n–{S}, {C}u–{I}n–{S},
                      and {H}g–{I}n–{S} {N}anocrystals of {S}mall {S}ize},
      journal      = {The journal of physical chemistry / C},
      volume       = {124},
      number       = {28},
      issn         = {1932-7455},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2021-00711},
      pages        = {15511 - 15522},
      year         = {2020},
      abstract     = {We present a detailed analysis of Raman and infrared (IR)
                      phonon spectra of strongly luminescent non-stoichiometric
                      M-In-S (M = Cu, Ag, Hg) and core/shell M-In-S/ZnS
                      nanocrystals (NCs) of small size (d  2-4 nm), formed by
                      means of aqueous colloidal chemistry under mild conditions.
                      Despite presumably similar factors determining position and
                      broadening of the Raman and X-ray diffraction (XRD) peaks,
                      phonon spectra are shown to be more sensitive to NC
                      composition and crystals structure. The spectral Raman
                      pattern of these strongly M-deficient M-In-S NCs is
                      different from that of the corresponding stoichiometric
                      phases, e.g. CuInS2 or AgIn5S8, and excludes its assignment
                      to relevant binary sulfides, e.g. In2S3. Resonant behavior
                      of relative peak intensities in Raman spectra is different
                      from that of larger-size stoichiometric NCs and bulk samples
                      studied before, while the temperature dependence reveals an
                      analogous enhancement of the highest-frequency LO modes
                      supporting an unambiguous assignment of the latter.
                      Therefore, we conclude that the Raman spectra observed are
                      characteristic of the specific structure of these highly
                      non-stoichiometric small NCs. IR modes of these NCs occur in
                      the same frequency range as the Raman ones but at higher
                      frequencies than the IR phonons in bulk material. The IR
                      spectra are less characteristic, compared to Raman ones,
                      revealing more similarity among the three NC compounds and
                      with the bulk counterparts.},
      cin          = {IEK-11},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-11-20140314},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / 530 - Science and Technology of Nanosystems
                      (POF3-500)},
      pid          = {G:(DE-HGF)POF3-113 / G:(DE-HGF)POF3-530},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000551543800062},
      doi          = {10.1021/acs.jpcc.0c03268},
      url          = {https://juser.fz-juelich.de/record/890122},
}