Jump to main content
Jump to site search

Issue 7, 2010
Previous Article Next Article

Synthesis and size-dependent crystallization of colloidal germanium telluride nanoparticles

Author affiliations

Abstract

Colloidal nanocrystals have long been used to study the dependence of phase stability and transitions on size. Both structural phase stability and phase transitions change dramatically in the nanometre size regime where the surface plays a significant role in determining the overall energetics of the system. We investigate the solid–solid phase transformation of crystallization in amorphous GeTe nanoparticles. We report a colloidal synthetic route to amorphous GeTe nanoparticles. Using in situ X-ray diffraction while heating, we observe the crystallization of the nanoparticles and find a dramatic increase of the crystallization temperature of over 150 °C above the bulk value. Using size-selected nanoparticle films, we show that the crystallization temperature depends strongly on the particle size. In addition, we measure the electrical resistance of nanoparticle films and observe over 5 orders of magnitude lower resistance for the crystalline film compared to the amorphous film. Finally, we discuss the implications of the size-dependence of crystallization in the context of both understanding the behavior of phase stability in the nanosize regime and applications to phase change memory devices.

Graphical abstract: Synthesis and size-dependent crystallization of colloidal germanium telluride nanoparticles

Back to tab navigation

Supplementary files

Publication details

The article was received on 18 Aug 2009, accepted on 21 Oct 2009 and first published on 09 Nov 2009


Article type: Paper
DOI: 10.1039/B917024C
Citation: J. Mater. Chem., 2010,20, 1285-1291
  •   Request permissions

    Synthesis and size-dependent crystallization of colloidal germanium telluride nanoparticles

    M. A. Caldwell, S. Raoux, R. Y. Wang, H.-S. Philip Wong and D. J. Milliron, J. Mater. Chem., 2010, 20, 1285
    DOI: 10.1039/B917024C

Search articles by author

Spotlight

Advertisements