% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{PalenciaRamrez:631530,
      author       = {Palencia Ramírez, Cristina and Seher, Robert and Krohn,
                      Jan and Thiel, Felix and Lehmkühler, Felix and Weller,
                      Horst},
      title        = {{F}ormation {D}ynamics of {N}anocrystals: {I}n-situ
                      {O}bservation of the {G}rowth of {C}d{S}e {NC}s {V}ia
                      {M}agic-sized {C}lusters {I}ntermediates.},
      publisher    = {Fundació Scito València},
      reportid     = {PUBDB-2025-02042},
      year         = {2019},
      comment      = {Proceedings of the nanoGe Fall Meeting19 - Fundació Scito
                      València, 2019. - ISBN - doi:10.29363/nanoge.nfm.2019.207},
      booktitle     = {Proceedings of the nanoGe Fall
                       Meeting19 - Fundació Scito València,
                       2019. - ISBN -
                       doi:10.29363/nanoge.nfm.2019.207},
      abstract     = {The pioneer synthesis of nanocrystals (NCs) published in
                      1993 opened up new routes to prepare highly monodisperse
                      quantum dots. This, together with the outstanding
                      electronical, optical and surface properties observed in
                      different kinds of such semiconductor nanocrystals, has
                      triggered an increased scientific interest on these
                      nanomaterials. As a result, well-defined methods to
                      synthesize and characterize NCs have been developed, and
                      very precise control on the synthesis allows obtaining a
                      variety of crystal structures, shapes and sizes. Despite
                      this, usually these advances are the result of trial-mistake
                      approaches and this is due to the lack of knowledge in the
                      events concurring during the formation of such nanocrystals.
                      The key point to investigate the formation dynamics of
                      nanocrystals lies on the possibility to in-situ characterize
                      nucleation and growth events, which take place from the
                      millisecond to second time window.To this aim, we have
                      designed and assembled a state-of-the-art continuous-flow
                      device to perform the synthesis of CdSe NCs at very
                      different reaction conditions. The addition of optical flow
                      cells and X-ray transparent flow cells enables in-situ
                      characterization by means of optical spectroscopy and
                      SAXS/WAXS experiments (synchrotron radiation facilities).
                      With this reactor we have studied the growth dynamics of
                      CdSe nanocrystals. Our results show that CdSe magic sized
                      clusters are formed always as intermediates in the formation
                      of CdSe nanocrystals. Whether they can be observed or not in
                      solution depends mainly on the reaction temperature, which
                      is closely related to the monomer concentration and the
                      nucleation rate. A series of experiments utilizing worked-up
                      CdSe clusters demonstrates our proposed new growth
                      mechanism, according to which, CdSe nanocrystals are formed
                      subsequently to burst dissolution of small CdSe magic sized
                      clusters and further growth into larger clusters and
                      nanocrystals. This new growth mechanism suggests that the
                      classical nucleation theory, as we know it, is no longer
                      suitable to explain formation processes in nanocrystals.},
      month         = {Nov},
      date          = {2019-11-03},
      organization  = {nanoGe Fall Meeting 2019, Berlin
                       (Germany), 3 Nov 2019 - 8 Nov 2019},
      cin          = {FS-SMP / DOOR ; HAS-User},
      cid          = {I:(DE-H253)FS-SMP-20171124 / I:(DE-H253)HAS-User-20120731},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3},
      experiment   = {EXP:(DE-H253)P-P03-20150101},
      typ          = {PUB:(DE-HGF)1 / PUB:(DE-HGF)3},
      doi          = {10.29363/nanoge.nfm.2019.207},
      url          = {https://bib-pubdb1.desy.de/record/631530},
}